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19-1682; Rev 0; 4/00
L MANUA ION KIT ALUAT DATA SHEET EV WS FOLLO
900MHz SiGe, High IP3, Low-Noise Amplifiers
Features
o Wide Frequency Range: 800MHz to 1000MHz o High Output IP3 and Adjustable +17dBm at 5.3mA +7dBm at 2.8mA o Low Noise Figure: 1.3dB at 900MHz o 13dB Attenuation Step (MAX2642) o On-Chip Output Matching o Low-Power Shutdown Mode o +2.7V to +5.5V Single-Supply Operation o Ultra-Small SC70-6 Package
General Description
The MAX2642/MAX2643 low-cost, high third-order intercept point (IP3), low-noise amplifiers (LNAs) are designed for applications in cellular, ISM, SMR, and PMR systems. They feature a programmable bias, allowing the IP3 and supply current to be optimized for specific applications. These LNAs provide up to 0dBm input IP3 while maintaining a low noise figure of 1.3dB. The gain for these devices is typically 17dB. The MAX2642 also features a 13dB attenuation step, which extends the LNA's dynamic range. Both devices feature a shutdown mode that minimizes power consumption. On-chip output matching saves board space by reducing the number of external components. The MAX2642/MAX2643 are designed on a low-noise, advanced silicon-germanium (SiGe) process technology. They operate from a +2.7V to +5.5V single supply and are available in the ultra-small 6-pin SC70 package.
MAX2642/MAX2643
________________________Applications
800MHz/900MHz Cellular Phones 900MHz Cordless Phones 868MHz/900MHz ISM-Band Wireless Data PMR/SMR/LMR
MAX2642EXT-T MAX2643EXT-T PART
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SC70-6 6 SC70-6 TOP MARK AAC AAD
Typical Operating Circuit
VCC 47pF
Pin Configuration
VCC LOW GAIN (ENABLE) BIAS BIAS
MAX2642 MAX2643
TOP VIEW
RBIAS 510
BIAS 1
HIGH GAIN (SHUTDOWN)
6
RFOUT
GND 2
L1 8.7nH C1 3.3pF 33k (10k) RFIN RFOUT RF OUTPUT
MAX2642 MAX2643
5
GND
RF INPUT
RFIN 3
4
VCC
SC70-6
GND ( ) ARE FOR MAX2643.
________________________________________________________________ Maxim Integrated Products
1
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V RFOUT to GND...........................................-0.3V to (VCC + 0.3V) RFIN to GND ..................................................................0 to 0.9V RFIN Power (50 source) ................................................+5dBm BIAS to GND ................................................................0 to +0.3V Operating Temperature Range ...........................-40C to +85C Maximum Junction Temperature .....................................+150C Continuous Power Dissipation (TA = +70C) SC70-6 (derate 3.1mW/C above +70C) ...................245mW Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS--MAX2642
(VCC = +2.7V to +5.5V, TA = -40C to +85C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50, highgain mode. Typical values are at VCC = 3.0V, TA = +25C, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER Supply Voltage
CONDITIONS High-gain mode, R BIAS = 510, TA = +25C RBIAS = 510, TA = -40C to +85C
MIN 2.7
TYP 5.3 3.6 2.8 5.9 0.2
MAX 5.5 6.7 7.5
UNITS V
Operating Supply Current
RBIAS = 806 RBIAS = 1.1k Low-gain mode, R BIAS = 510, TA = 25C
mA
Shutdown Supply Current Gain Control Voltage Input Gain Control Input Current
BIAS = unconnected (see Applications Information) High-gain mode (Note 4) Low-gain mode (Note 5) High-gain mode (Note 6) Low-gain mode (Note 7) 2.0 -10 0
mA 0.6 0 50 V A
DC ELECTRICAL CHARACTERISTICS--MAX2643
(VCC = +2.7V to +5.5V, TA = -40C to +85C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50. Typical values are at VCC = 3.0V, TA = +25C, unless otherwise noted.) (Notes 1, 8, 9)
PARAMETER Supply Voltage
CONDITIONS RBIAS = 510, TA = +25C
MIN 2.7
TYP 5.1 3.4 2.6 0.2
MAX 5.5 6.5 7.3
UNITS V
Operating Supply Current
RBIAS = 510, TA = -40C to +85C RBIAS = 806 RBIAS = 1.1k Shutdown mode (see Applications Information) Normal operation (Note 10) Shutdown mode (Note 11) Normal operation (Note 7) Shutdown mode (Note 6) 2.0 0 -5
mA
Shutdown Supply Current Shutdown Control Input Voltage Shutdown Control Input Current
10 0.6 10 5
A V A
2
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900MHz SiGe, High IP3, Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS
(MAX2642/MAX2643 EV kits, PRFIN = -30dBm, fRFIN = 900MHz, input and output are terminated to 50, VCC = +3.0V, TA = +25C, RBIAS = 510, unless otherwise noted.) (Note 12)
MAX2642/MAX2643
PARAMETER Operating Frequency Range Gain (Note 14) Gain Variation Over Temperature Attenuation Step Input Third-Order Intercept Point (Note 15) Input 1dB Compression Point Noise Figure (Note 16) Input Return Loss Output Return Loss Reverse Isolation Gain-Step Response Time Shutdown Response Time
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Note 13: Note 14: Note 15: Note 16:
CONDITIONS (Note 13) TA = +25C TA = -40C to +85C MAX2642 only RBIAS = 510 RBIAS = 806 RBIAS = 1.1k MAX2642, low-gain mode MAX2642, low-gain mode
MIN 800 14.5
TYP 16.7 0.35 13 0 -5 -10 -18 -17 1.35 4.3
MAX 1000 19 0.75
UNITS MHz dB dB dB dBm
dBm 1.6 dB dB dB dB 10 10 s s
-10 MAX2642, low-gain mode MAX2642, low-gain mode MAX2642, low-gain mode MAX2642 MAX2643 MAX2642, through series switch at BIAS -10 -10 -10 -20 -10
-12 -18 -14 -11 -26 -17 5 6 12
Devices are production tested at TA = +25C. Minimum and maximum values are guaranteed by design and characterization over temperature and supply voltage. High-gain mode is set for the MAX2642 by connecting RFOUT to GND through a 33k resistor. Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to VCC through a 33k resistor. Maximum DC voltage through a 33k resistor that sets the MAX2642 to operate in high-gain mode. Minimum DC voltage through a 33k resistor that sets the MAX2642 to operate in low-gain mode. DC current required when RFOUT is connected to GND through a 33k resistor (MAX2642) and 10k resistor (MAX2643). DC current required when RFOUT is connected to VCC through a 33k resistor (MAX2642) and 10k resistor (MAX2643). Normal operation is set for the MAX2643 by connecting RFOUT to VCC through a 10k resistor. Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10k resistor. Minimum DC voltage through a 10k resistor that sets the MAX2643 to operate in normal mode. Maximum DC voltage through a 10k resistor that sets the MAX2643 to operate in shutdown mode. Min/Max limits are guaranteed by design and characterization, except gain is production tested at TA = +25C. The part has been characterized at the specified frequency range. Operation outside this range is possible but not guaranteed. Devices are production tested at TA = +25C. Measured with two input tones, f1 = 895MHz and f2 = 905MHz, both at -30dBm per tone. Excludes PC board losses (0.25dB typical at the input of the MAX2642/MAX2643 EV kit).
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Typical Operating Characteristics
(MAX2642/MAX2643 EV kits, VCC = +3.0V, PRFIN = -30dBm, input and output are terminated to 50, fRFIN = 900MHz, RBIAS = 510, high-gain mode (low-gain mode is applicable only to the MAX2642), TA = +25C, unless otherwise noted.)
INPUT THIRD-ORDER INTERCEPT vs. RBIAS (HIGH GAIN)
MAX2642/43-01
MAX2642/43-02
3 1 INPUT IP3 (dBm) -1 -3 -5 -7 -9 -11 -13 -15 0 TA = -40C TA = +25C TA = +85C
MATCHED AT 900MHz LOW GAIN
5 NOISE FIGURE (dB) 4 3 2 1
INPUT IP3 (dBm)
TA = +85C
HIGH GAIN
TA = -40C TA = +25C
-15 200 400 600 800 1000 1200 1400 1600 1800 RBIAS () 0 500 1000 RBIAS () 1500 2000
0 800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
NOISE FIGURE vs. TEMPERATURE
MAX2642/43-04
P1dB vs. RBIAS
MAX2642/43-05
OUTPUT POWER vs. INPUT POWER
8 4 0 POUT (dBm) -4 -8 -12 -16 1.1k, LOW GAIN 806, LOW GAIN 510, LOW GAIN -30 -26 -22 -18 -14 -10 -6 -2 2 510, HIGH GAIN 806, HIGH GAIN 1.1k, HIGH GAIN
MAX2642/43-06 MAX2642/43-09
6 5 NOISE FIGURE (dB) LOW GAIN 4 3 2 1 0 -40 -20 0 20 40 60 80 HIGH GAIN
-8 TA = +85C, LOW GAIN -10 -12 P1dB (dBm) -14 -16 -18 -20 -22 -24 100 0 TA = -40C, HIGH GAIN TA = +25C, LOW GAIN TA = +85C, HIGH GAIN TA = -40C, LOW GAIN
12
-20 TA = +25C, HIGH GAIN -24 -28
200 400 600 800 1000 1200 1400 1600 1800 RBIAS ()
TEMPERATURE (C)
PIN (dBm)
GAIN vs. RBIAS
20 18 16 14 12 10 8 6 4 2 0 -2 -4 0 TA = +85C, LOW GAIN 200 400 600 800 1000 1200 1400 1600 1800 RBIAS() GAIN (dB)
MAX2642/43-07
GAIN vs. SUPPLY VOLTAGE
MAX2642/43-08
GAIN vs. FREQUENCY
20 18 16 14 GAIN (dB) 12 10 8 6 HIGH-GAIN MODE MATCHED AT 900MHz
20 18 16 14 12 GAIN (dB) 10 8 6 4 2 0 -2 -4 2.4 2.8 3.2 3.6 4.0 VCC (V) 4.4 4.8 5.2 TA = -40C, HIGH GAIN
TA = -40C, HIGH GAIN TA = +25C, HIGH GAIN TA = +85C, HIGH GAIN
TA = +25C, HIGH GAIN TA = +85C, HIGH GAIN TA = -40C, LOW GAIN TA = +25C, LOW GAIN
TA = +25C, LOW GAIN TA = -40C, LOW GAIN
TA = +85C, LOW GAIN
4 2 0 5.6
LOW-GAIN MODE
800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
4
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MAX2642/43-03
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MAX2642 INPUT THIRD-ORDER INTERCEPT vs. RBIAS (LOW GAIN)
11 9 7 5 3 1 -1 -3 -5 -7 -9 -11 -13 6
NOISE FIGURE vs. FREQUENCY
900MHz SiGe, High IP3, Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(MAX2642/MAX2643 EV kits, VCC = +3.0V, PRFIN = -30dBm, input and output are terminated to 50, fRFIN = 900MHz, RBIAS = 510, high-gain mode (low-gain mode is applicable only to the MAX2642), TA = +25C, unless otherwise noted.)
MAX2642 ATTENUATION STEP vs. FREQUENCY
MAX2642/43-10
MAX2642/MAX2643
RETURN LOSS vs. FREQUENCY (HIGH GAIN)
MAX2642/43-11
MAX2642 RETURN LOSS vs. FREQUENCY (LOW GAIN)
MATCHED AT 900MHz
MAX2642/43-12
14.0 13.8 ATTENUATION STEP (dB) 13.6 13.4 13.2 13.0 12.8 12.6
MATCHED AT 900MHz
0 -5 ATTENUATION STEP (dB)
MATCHED AT 900MHz INPUT
0 -5 RETURN LOSS (dB) -10 -15 -20 -25 -30 -35
-10 -15 OUTPUT -20 -25 -30 -35
OUTPUT
INPUT
800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
REVERSE ISOLATION vs. FREQUENCY
MATCHED AT 900MHz
MAX2642/43-13
MAX2642 HIGH/LOW-GAIN SWITCH CHARACTERISTICS
MAX2642/43-14
MAX2643 SHUTDOWN CHARACTERISTICS
-10 OUTPUT POWER (dBm) -20 -30 -40 -50 -60 -70 -80 VRFOUT 3V 0V
MAX2642/43-15
0 -5 RETURN LOSS (dB) -10 -15 -20
0 -10 OUTPUT POWER (dBm) -20 -30 -40 0V -50 -60 VRFOUT 3V
0
LOW GAIN
HIGH GAIN -25 -30 -35 800 820 840 860 880 900 920 940 960 980 1000 FREQUENCY (MHz)
-90 TIME (400ns/div) TIME (4s/div)
SUPPLY CURRENT vs. RBIAS
MAX2642/43-16
SHUTDOWN CURRENT vs. TEMPERATURE
MAX2642/43-17
SUPPLY CURRENT vs. SUPPLY VOLTAGE
7.6 7.2 SUPPLY VOLTAGE (mA) 6.8 6.4 6.0 5.6 5.2 4.8 4.4 TA = +25C, HIGH GAIN TA = -40C, LOW GAIN TA = -40C, HIGH GAIN TA = +85C, HIGH GAIN TA = +85C, LOW GAIN TA = +25C, LOW GAIN
MAX2642/43-18
16 14 SUPPLY CURRENT (mA) 12 10 8 6 4 2 0 0 TA = -40C, HIGH GAIN TA = +85C, LOW GAIN TA = +85C, HIGH GAIN TA = +25C, LOW GAIN TA = +25C, HIGH GAIN TA = -40C, LOW GAIN
10 VCC = 5.5V
8.0
SHUTDOWN CURRENT (A)
1
0.1
0.01
VCC = 3.0V
0.001
0.0001 200 400 600 800 1000 1200 1400 1600 RBIAS () -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
4.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE (V)
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Pin Description
PIN 1 2, 5 3 4 6 NAME BIAS GND RFIN VCC RFOUT FUNCTION Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply current (see Applications Information). The current through this pin is approximately 50mV divided by RBIAS. Ground. For optimum performance, provide a low-inductance connection to the ground plane. Amplifier Input. AC-couple to this pin with a DC-blocking capacitor. External matching network is required for optimum performance. Supply Voltage. Bypass with a 47pF capacitor directly to ground at the supply pin. Additional bypassing may be necessary for long VCC lines. Amplifier Output. Internally matched to 50. DC bias on this pin selects gain mode (MAX2642) or shutdown mode (MAX2643) (see Applications Information).
Applications Information
Input Matching
Input matching is required for optimum performance. The MAX2642/MAX2643 require a simple LC matching network, as shown in the Typical Operating Circuit. To further reduce cost and external component count, replace the external inductor with a microstrip transmission line. The Typical Operating Circuit shows the recommended input-matching networks for the MAX2642/ MAX2643 at 900MHz. These values are optimized for best simultaneous gain, noise figure, and return-loss performance. To aid in the design of the matching network for other frequencies, Tables 1-6 list typical device S-parameters for various biases, and Tables 7, 8, and 9 list typical device noise parameters.
Shutdown
For the MAX2643, the recommended shutdown method is to set the DC voltage at the RFOUT pin in a manner similar to the MAX2642's attenuation step. That is, when the DC voltage at RFOUT is below +0.6V, the device is shut down; if the DC voltage is greater than +2.0V, the device is enabled. For the MAX2642, shutdown is achieved by leaving BIAS unconnected. Figure 1 shows the suggested shutdown methods. Avoid capacitance at the BIAS pin by connecting the bias resistor from BIAS to the switch. Table 10 summarizes the operational modes.
Layout Issues
A properly designed PC board is essential to any RF/microwave circuit. Use controlled impedance lines on all high-frequency inputs and outputs. Bypass with decoupling capacitors located close to the device VCC pin. For long VCC lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located farther away from the device package. Proper grounding of the GND pins is essential. If the PC board uses a topside RF ground, connect it directly to all GND pins. For a board where the ground plane is not on the component layer, the best technique is to connect the GND pins to the board with a plated through-hole located close to the package.
Attenuation Step (MAX2642)
The MAX2642's DC bias voltage at RFOUT serves as an attenuation step input. When the DC voltage at RFOUT through a 33k resistor is less than +0.6V, the device is in high-gain mode; if the DC voltage is greater than +2.0V, the device is in low-gain mode. A standard logic output can be applied as shown in the Typical Operation Circuit. If no bias is applied, the device is in high-gain mode.
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 1. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 510, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.832641 0.825168 0.785389 0.73798 0.728099 0.718704 0.711335 0.705742 0.699509 0.695913 0.690406 0.68522 0.681722 0.675328 0.657582 0.635999 0.616881 0.602418 0.587409
S11 PHASE (DEGREES) -69.5831 -83.7622 -97.3356 -108.682 -110.578 -112.499 -114.276 -115.973 -117.585 -119.117 -120.995 -122.642 -124.345 -126.035 -134.195 -141.558 -147.886 -153.992 -158.21
S21 MAG 2.390806 3.836967 4.983279 5.320575 5.286 5.241719 5.185213 5.118265 5.050356 4.973824 4.897571 4.826106 4.735407 4.650673 4.29304 3.998256 3.777511 3.547677 3.338385
S21 PHASE (DEGREES) -119.18 -136.451 -161.126 174.5337 170.3323 166.3987 162.4763 158.9238 155.6292 152.4338 149.4286 146.6999 143.8275 141.4611 130.7613 121.5475 113.2893 105.6808 97.62961
S12 MAG 0.010763 0.019608 0.02988 0.036197 0.037193 0.037266 0.039143 0.039563 0.042586 0.041805 0.04301 0.046528 0.04524 0.046036 0.053825 0.061434 0.066092 0.075756 0.076491
S12 PHASE (DEGREES) 166.6047 167.8741 148.5203 134.8794 132.505 129.1671 128.0447 128.4158 128.075 126.9362 122.9564 122.0997 121.0474 120.1779 116.4169 109.6365 103.583 99.08275 92.84421
S22 MAG 0.878515 0.731997 0.481344 0.215462 0.171633 0.135415 0.100779 0.076864 0.062918 0.06007 0.065287 0.077374 0.090494 0.103072 0.156945 0.198686 0.240437 0.283245 0.326279
S22 PHASE (DEGREES) -74.01422 -98.95091 -125.1027 -142.0387 -141.9486 -139.9869 -133.8375 -121.3533 -102.3972 -81.32555 -62.51575 -50.8638 -44.30662 -40.69565 -34.00603 -32.62157 -33.12784 -36.62076 -40.68451
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 2. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 806, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.865705 0.853946 0.820187 0.775557 0.765138 0.759 0.7495 0.741722 0.736069 0.728957 0.724118 0.719676 0.714506 0.709103 0.691292 0.67035 0.650556 0.635363 0.616202
S11 PHASE (DEGREES) -67.5629 -80.7084 -94.1329 -104.428 -106.343 -108.042 -109.928 -111.683 -113.369 -115.127 -116.951 -118.584 -120.313 -121.959 -129.341 -136.703 -143.014 -148.565 -153.536
S21 MAG 1.788918 2.926709 3.884537 4.237314 4.226094 4.214913 4.182436 4.134814 4.085018 4.032105 3.965561 3.903364 3.83867 3.777 3.483283 3.27255 3.09574 2.934971 2.756155
S21 PHASE (DEGREES) -115.899 -132.446 -157.426 177.9528 173.3886 169.298 165.3457 161.548 157.8688 154.6118 151.3371 148.3141 145.3527 142.7001 131.8578 121.9156 113.1691 105.3286 96.43876
S12 MAG 0.009763 0.021656 0.029766 0.036728 0.038253 0.038842 0.040084 0.04118 0.04194 0.044642 0.044574 0.044792 0.045551 0.046434 0.054775 0.061407 0.064829 0.075142 0.074664
S12 PHASE (DEGREES) 164.6001 165.374 148.5047 130.1148 129.5942 128.7876 127.3742 127.2791 125.3719 123.3553 121.8034 120.7695 118.109 119.036 114.7347 108.2008 103.5856 97.9223 92.88747
S22 MAG 0.880237 0.739354 0.49107 0.216415 0.166772 0.121201 0.082263 0.045314 0.016624 0.021369 0.043243 0.066898 0.084163 0.102269 0.169693 0.220689 0.26965 0.315264 0.360706
S22 PHASE (DEGREES) -73.81893 -99.52715 -128.1454 -153.3392 -157.7809 -160.7175 -160.9349 -158.0615 -133.0426 -38.41852 -17.90431 -14.20027 -12.76007 -13.88384 -18.18657 -21.72272 -24.86245 -30.21604 -35.70454
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 3. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 1.1k, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.878512 0.86813 0.834311 0.793611 0.783644 0.774329 0.767016 0.762463 0.753622 0.748921 0.743011 0.737437 0.733572 0.729122 0.710864 0.688941 0.668471 0.655478 0.638124
S11 PHASE (DEGREES) -66.0475 -79.0081 -91.9431 -102.384 -104.098 -105.921 -107.766 -109.461 -111.254 -113.148 -114.988 -116.709 -118.379 -119.87 -127.286 -134.781 -141.275 -146.685 -152.12
S21 MAG 1.445864 2.398259 3.218232 3.544617 3.563583 3.546937 3.529998 3.500193 3.463616 3.419726 3.36768 3.309045 3.261195 3.203007 2.970843 2.789044 2.637086 2.491515 2.352013
S11 PHASE (DEGREES) -114.652 -131.281 -155.869 179.1002 174.4488 170.1934 165.871 161.8438 158.0655 154.6982 151.2749 148.0373 145.4087 142.5148 130.8328 120.5809 111.4044 103.3737 94.07729
S12 MAG 0.011049 0.01977 0.033312 0.038594 0.040112 0.038383 0.04004 0.041375 0.043587 0.043975 0.045614 0.044426 0.046581 0.048343 0.055616 0.061803 0.065281 0.073887 0.077901
S12 PHASE (DEGREES) 175.9688 166.0087 149.3926 131.9641 131.6111 128.1902 126.4807 124.4402 123.8527 123.9237 121.0385 118.9012 118.374 116.9249 115.1579 105.9973 100.6171 96.84646 90.34502
S22 MAG 0.882121 0.745577 0.502282 0.223248 0.173175 0.126351 0.086328 0.049822 0.020398 0.024778 0.04661 0.070736 0.092621 0.110062 0.183756 0.238134 0.289607 0.335752 0.381179
S22 PHASE (DEGREES) -73.97408 -100.0799 -129.8978 -160.5161 -166.8809 -173.2415 178.6352 167.1237 128.5957 48.71712 18.5372 10.02515 4.197083 -0.293905 -10.46082 -16.81635 -21.34393 -27.6725 -33.81158
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9
900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 4. MAX2642 Typical Scattering Parameters
(RBIAS = 510, low-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.757279 0.75734 0.696969 0.626874 0.616023 0.608751 0.600617 0.596488 0.593722 0.590101 0.588409 0.589625 0.588079 0.588646 0.597562 0.6066 0.617079 0.628195 0.640304
S11 PHASE (DEGREES) -68.0641 -84.3042 -98.422 -107.497 -108.596 -109.794 -110.754 -111.776 -112.739 -113.712 -114.834 -115.806 -116.828 -117.975 -124.002 -129.873 -136.272 -142.195 -147.446
S21 MAG 0.186886 0.715305 1.140352 1.272844 1.267541 1.258504 1.242296 1.22394 1.203776 1.181885 1.156787 1.129734 1.102653 1.074686 0.952505 0.852237 0.778154 0.718399 0.656535
S21 PHASE (DEGREES) -175.019 -146.702 -174.61 157.4571 152.644 148.0772 143.7583 139.7228 135.9799 132.3471 128.909 125.6671 122.5478 119.9067 108.5103 99.7348 92.06538 85.7905 78.77735
S12 MAG 0.032297 0.066113 0.099941 0.115242 0.116521 0.117601 0.119312 0.122318 0.124196 0.125203 0.126462 0.127369 0.127952 0.12743 0.134236 0.138354 0.142609 0.153771 0.149518
S12 PHASE (DEGREES) 163.9787 148.5775 124.8504 103.1406 100.3007 97.74948 95.48379 93.07481 90.21815 86.9857 84.27329 82.07469 80.98836 79.48192 72.42102 65.08001 58.40858 52.64912 46.71009
S22 MAG 0.87996 0.71413 0.449346 0.201112 0.165909 0.137812 0.118557 0.106845 0.103446 0.108109 0.116508 0.129083 0.140436 0.151608 0.206216 0.252003 0.295689 0.33692 0.374046
S22 PHASE (DEGREES) -73.8882 -98.6736 -121.361 -127.267 -123.451 -116.955 -107.057 -93.617 -81.5882 -70.2192 -61.7886 -55.1485 -52.3827 -48.4917 -43.8143 -43.9084 -46.8967 -51.7496 -56.7658
10
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 5. MAX2642 Typical Scattering Parameters
(RBIAS = 806, low-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.800327 0.793203 0.736656 0.676741 0.666567 0.660377 0.651791 0.651106 0.643048 0.643064 0.641773 0.640079 0.641175 0.641025 0.647379 0.651053 0.65637 0.662035 0.665418
S11 PHASE (DEGREES) -67.1945 -81.9096 -95.21 -103.586 -104.763 -106.009 -107.125 -108.175 -109.302 -110.728 -111.842 -113.103 -114.555 -115.739 -121.754 -128.101 -134.578 -139.905 -145.73
S21 MAG 0.142134 0.543072 0.885917 1.005172 1.005053 0.998032 0.990225 0.978178 0.961026 0.942776 0.923851 0.90238 0.879907 0.857382 0.760331 0.685309 0.623917 0.582929 0.53929
S21 PHASE (DEGREES) -174.341 -143.848 -171.542 159.8524 154.9507 150.1753 145.7345 141.4141 137.4554 133.7632 130.1361 126.9098 123.7699 120.9598 109.613 100.4887 93.1824 86.98415 79.50793
S12 MAG 0.034805 0.067027 0.101665 0.114894 0.115809 0.118042 0.118937 0.121575 0.120654 0.123645 0.123333 0.12394 0.123001 0.122316 0.127968 0.131962 0.132337 0.142149 0.138295
S12 PHASE (DEGREES) 161.583 146.5234 122.4962 101.0446 97.08399 94.72314 91.64486 89.19647 86.75212 83.74419 80.71953 78.64308 76.38534 74.64619 68.72507 62.04964 56.01043 51.5965 45.87176
S22 MAG 0.88084 0.719105 0.449898 0.183694 0.143872 0.109486 0.085206 0.071836 0.0738 0.084769 0.098778 0.117484 0.132356 0.145883 0.209937 0.260554 0.303628 0.34549 0.382116
S22 PHASE (DEGREES) -73.57176 -99.08562 -124.5513 -136.0146 -133.6185 -125.307 -112.6535 -92.15154 -70.16955 -54.68721 -46.62902 -40.63098 -38.28101 -35.93101 -35.70716 -37.84105 -41.83445 -46.96146 -52.44192
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11
900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 6. MAX2642 Typical Scattering Parameters
(RBIAS = 1.1, low-gain mode, VCC = +3.0V, TA = +25C.)
FREQ (MHz) 500 600 700 800 820 840 860 880 900 920 940 960 980 1000 1100 1200 1300 1400 1500
S11 MAG 0.822139 0.808058 0.755255 0.703243 0.694461 0.687512 0.683106 0.678346 0.674815 0.672424 0.671111 0.669825 0.670457 0.669392 0.674741 0.675283 0.679379 0.682813 0.681251
S11 PHASE (DEGREES) -66.5029 -80.314 -93.0574 -101.403 -102.693 -103.96 -105.16 -106.424 -107.654 -109.092 -110.488 -111.738 -113.266 -114.649 -120.914 -127.763 -134.523 -139.869 -145.854
S21 MAG 0.116321 0.439837 0.72921 0.838753 0.839017 0.836295 0.82921 0.818297 0.807407 0.791395 0.775375 0.757139 0.737655 0.719178 0.638029 0.575544 0.52948 0.494615 0.462984
S21 PHASE (DEGREES) -174.275 -143.103 -170.915 160.4014 155.3972 150.551 145.8221 141.5384 137.4799 133.7297 129.9834 126.6652 123.3462 120.6109 109.1083 100.3768 92.75184 86.94255 79.4068
S12 MAG 0.03386 0.065964 0.0999 0.115609 0.116069 0.117021 0.116949 0.119552 0.121372 0.122328 0.120584 0.120221 0.120881 0.11967 0.123318 0.125601 0.126691 0.133067 0.128294
S12 PHASE (DEGREES) 162.1213 146.0581 121.1126 98.56961 94.64113 92.14834 88.49732 86.39616 83.98519 80.33097 78.46327 75.62165 73.65825 71.31908 66.28802 58.42145 54.07481 49.83734 43.41453
S22 MAG 0.879442 0.724703 0.457496 0.181063 0.138616 0.098228 0.068493 0.049577 0.052964 0.070844 0.089595 0.110248 0.125584 0.14489 0.21152 0.264377 0.308252 0.348366 0.386044
S22 PHASE (DEGREES) -73.74798 -99.6653 -126.0206 -141.9359 -140.7761 -136.1769 -122.4536 -93.92001 -64.05054 -44.45571 -37.15094 -31.16879 -29.76813 -28.6178 -30.89364 -34.10688 -38.78385 -44.59462 -50.022
12
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900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 7. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 510, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQUENCY (MHz) 800 850 875 900 925 950 1000
NFMIN (dB) 1.011 1.023 1.030 1.037 1.045 1.053 1.069
opt MAG 0.3074 0.3016 0.2990 0.2965 0.2942 0.2919 0.2879
opt PHASE (DEGREES) 55.04 58.89 60.83 62.77 64.70 66.62 70.40
RN () 13.11 13.28 13.38 13.49 13.60 13.72 13.96
Table 8. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 806, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQUENCY (MHz) 800 850 875 900 925 950 1000
NFMIN (dB) 1.149 1.161 1.168 1.176 1.185 1.194 1.213
opt MAG 0.3905 0.3832 0.3798 0.3766 0.3735 0.3705 0.3650
opt PHASE (DEGREES) 54.95 58.63 60.49 62.35 64.21 66.06 69.72
RN () 15.14 15.32 15.43 15.55 15.68 15.82 16.11
Table 9. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 1.1k, high-gain mode, VCC = +3.0V, TA = +25C.)
FREQUENCY (MHz) 800 850 875 900 925 950 1000
NFMIN (dB) 1.312 1.325 1.333 1.342 1.352 1.363 1.385
opt MAG 0.4473 0.4391 0.4353 0.4317 0.4282 0.4249 0.4186
opt PHASE (DEGREES) 55.50 59.12 60.96 62.79 64.63 66.46 70.08
RN () 17.64 17.83 17.96 18.11 18.26 18.43 18.78
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13
900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
Table 10. Gain Selection and Shutdown Modes
BIAS BIAS
PART MAX2642 MAX2643
CONTROL VOLTAGE = VCC Low Gain Enabled
CONTROL VOLTAGE = 0 High Gain Shutdown
RBIAS
MAX2642
RBIAS
MAX2642
Chip Information
TRANSISTOR COUNT: 158
(A)
(B)
Figure 1. MAX2642 Recommended Shutdown Configurations
14
______________________________________________________________________________________
900MHz SiGe, High IP3, Low-Noise Amplifiers
Package Information
SC70, 6L.EPS
MAX2642/MAX2643
______________________________________________________________________________________
15
900MHz SiGe, High IP3, Low-Noise Amplifiers MAX2642/MAX2643
NOTES
16
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