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RF2713 Quadrature Modulator/Demodulator
RF2713
QUADRATURE MODULATOR/DEMODULATOR
RoHS Compliant & Pb-Free Product Package Style: SOIC-14
Features
3V to 6V Operation Modulation or Demodulation IF From 100kHz to 250MHz Baseband From DC to 50MHz Digital LO Quadrature Divider Low Power and Small Size
I INPUT A 1 I INPUT B 2 Q INPUT A 3 Q INPUT B 4 BG OUT 5 I IF OUT 6 Q IF OUT 7 QUAD DIV. BY 2
14 VCC 13 LO INPUT 12 GND 11 GND 10 GND 9 I OUT 8 Q OUT
Applications
Digital and Analog Receivers and Transmitters High Data Rate Digital Communications Spread-Spectrum Communication Systems Interactive Cable Systems Portable Battery-Powered Equipment
Functional Block Diagram
Product Description
The RF2713 is a monolithic integrated quadrature modulator/demodulator. The demodulator is used to recover the I and Q baseband signals from the amplified and filtered IF. Likewise, the inputs and outputs can be reconfigured to modulate I/Q signals onto an RF carrier. The RF2713 is intended for IF systems where the IF frequency ranges from 100kHz to 250MHz, and the LO frequency is two times the IF. The IC contains all of the required components to implement the modulation/demodulation function and contains a digital divider type 90 phase shifter, two double balanced mixers, and baseband amplifiers designed to interface with Analog to Digital Converters. The unit operates from a single 3V to 6V power supply.
Ordering Information
RF2713 RF2713 PCBA-D RF2713 PCBA-M Quadrature Modulator/Demodulator Fully Assembled Evaluation Board (Demodulator) Fully Assembled Evaluation Board (Modulator)
Optimum Technology Matching(R) Applied
GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT
RF MICRO DEVICES(R), RFMD(R), Optimum Technology Matching(R), Enabling Wireless ConnectivityTM, PowerStar(R), POLARISTM TOTAL RADIOTM and UltimateBlueTM are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. (c)2006, RF Micro Devices, Inc.
Rev A5 DS061016
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RF2713
Absolute Maximum Ratings Parameter
Supply Voltage IF Input Level Operating Ambient Temperature Storage Temperature
Rating
-0.5 to 7.0 500 -40 to +85 -40 to +150
Unit
VDC mVPP C C
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. RoHS status based on EUDirective2002/95/EC (at time of this document revision). The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice.
Parameter
Overall
IF Frequency Range
Min.
Specification Typ.
Max.
Unit
Condition
T=25C, VCC =3.0V, IF=100MHz, LO=200MHz, FMOD =500kHz
0.1
265
MHz
For IF frequencies below ~2.5MHz, the LO should be a square wave. IF frequencies lower than 100kHz are attainable if the LO is a square wave and sufficiently large DC blocking capacitors are used. Each input, single-ended Twice (2x) the IF frequency. For IF frequencies below ~2.5MHz, the LO should be a square wave. IF frequencies lower than 100kHz are attainable if the LO is a square wave and sufficiently large DC blocking capacitors are used.
Baseband Frequency Range Input Impedance
DC 1200 || 1pF
50
MHz
LO
Frequency
Level Input Impedance
0.06 500 || 1pF 170 || 1pF 2.5 20 22.5 24 24 28
0.8
VPP IFIN =28mVPP, LO=200mVPP, ZLOAD =10k VPP dB Each output, IOUT and QOUT @ 1MHz Saturated VCC =3.0V VCC =5.0V Single Sideband, IF Input of device reactively matched Single Sideband, 50 shunt resistor at IF Input VCC =3.0V, IF Input of device reactively matched VCC =3.0V, 50 shunt resistor at IF Input VCC =5.0V, IF Input of device reactively matched dBm dBm VCC =5.0V, 50 shunt resistor at IF Input VCC =5.0V, IF Input of device reactively matched, ZLOAD =50
Demodulator Configuration
Output Impedance Maximum Output Voltage Gain Noise Figure
25.1
dB dB
33
dB dBm dBm
Input Third Order Intercept Point (IIP3)
-22 -11 -19 -8 -28
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Rev A5 DS061016
RF2713
Parameter
Demodulator Configuration, cont.
Input 1dB Compression Point I/Q Amplitude Balance Quadrature Phase Error DC Output 2.0 DC Offset -21 -18.5 0.1 1 800 2.4 <10 -23 90 6 0.1 1 25 2.8 100 0.5 dBm dB mV V mV dBm mVPP dB dB dBc Unadjusted. Carrier Suppression may be optimized further by adjusting the DC offset level between the A and B inputs. VCC =3.0V, IOUT and QOUT to GND VCC =5.0V, IOUT and QOUT to GND IOUT to QOUT IFIN =28mVPP, LO=200mVPP, ZLOAD =1200 Saturated Single Sideband, 1dB Gain Compression. Single Sideband
Min.
Specification Typ.
Max.
Unit
Condition
IFIN =28mVPP, LO=200mVPP, ZLOAD =10k VCC =5.0V, 50 shunt at IF Input
Modulator Configuration
Maximum Output Input Voltage Voltage Gain I/Q Amplitude Balance Quadrature Phase Error Carrier Suppression
Sideband Suppression
30 3.0 8 8 10 12 6.0
dBc V mA mA Operating limits VCC =3.0V VCC =5.0V
Power Supply
Voltage Current
Rev A5 DS061016
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RF2713
Pin 1 Function I INPUT A Description (Demodulator Configuration)
When the RF2713 is configured as a Quadrature Demodulator, both mixers are driven by the IF. Whether driving the mixers single-endedly (as shown in the application schematic) or differentially, the A Inputs (pins 1 and 3) should be connected to each other. Likewise, both B Inputs (pins 2 and 4) should be connected to each other. This ensures that the IF will reach each mixer with the same amplitude and phase, yielding the best I and Q output amplitude and quadrature balance. Note that connecting the inputs in parallel changes the input impedance (see the Gilbert Cell mixer equivalent circuit). The single-ended input impedance (as shown in the application circuit) becomes 630, but in the balanced configuration, the input impedance would remain 1260.
Interface Schematic
VCC VCC
1260 INPUT A
1260 INPUT B
2 3 4 5
I INPUT B Q INPUT A Q INPUT B BG OUT
The mixers are Gilbert Cell designs with balanced inputs. The equivalent schematic for one of the mixers is shown on the following page. The input impedance of each pin is determined by the 1260 resistor to VCC in parallel with a transistor base. Note from the schematic that all four input pins have an internally set DC bias. For this reason, all four inputs (pins 1 through 4) should be DC blocked. The capacitance values of the blocking capacitors is determined by the IF frequency. When driving single-endedly, both the series (pins 1 and 3) and shunt (pins 2 and 4) blocking capacitors should be low impedances, relative to the 630 input impedance. Same as pin 1, except complementary input. See pin 1. Same as pin 1, except Q Buffer Amplifier. Same as pin 3, except complementary input. Band Gap voltage reference output. This voltage output is held constant over variations in supply voltage and operating temperature and may be used as a reference for other external circuitry. This pin should not be loaded such that the sourced current exceeds 1mA. This pin should be bypassed with a large (0.1F) capacitor. This pin is not used in the Demodulator Configuration, but must be connected to VCC in order to properly bias the I mixer. Same as pin 6, except Q mixer. Q Mixer's Baseband Output. This pin is NOT internally DC blocked and has DC present due to internal biasing. This is an emitter-follower type output with an internal 2k pull-down resistor. Even though the AC output impedance is ~50, this pin is intended to drive only high impedance loads such as an opamp or an ADC. The output transistor is NOT biased such that it can drive a large signal into a 50 load. DC coupling of this output is permitted provided that the DC impedance to ground, which appears in parallel with the internal pull-down resistor, is significantly greater than 2k. Same as pin 8, except Q Mixer's Baseband Output. Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. Same as pin 10. Same as pin 10. Same as pin 6.
VCC
See pin 1. See pin 1.
6 7 8
I IF OUT Q IF OUT Q OUT
IF OUT
I/Q OUT 2 k
9 10 11 12
I OUT GND GND GND
Same as pin 8.
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Rev A5 DS061016
RF2713
Pin 13 Function LO INPUT Description (Demodulator Configuration)
High impedance, single-ended modulator LO input. The LO applied to this pin is frequency divided by a factor of 2 and becomes the "Carrier". For direct demodulation, the Carrier is equal in frequency to the center of the input IF spectrum (except in the case of SSB/SC). The input impedance is determined by an internal 500 bias resistor to VCC. An external blocking capacitor should be provided if the pin is connected to a device with DC present. Matching the input impedance is typically achieved by adding a 51 resistor to ground on the source side of the AC coupling capacitor. For the LO input, maximum power transfer is not critical. The internal LO switching circuits are controlled by the voltage, not power, into the part. In cases where the LO source does not have enough available voltage, a reactive match (voltage transformer) can be used. The LO circuitry consists of a limiting amplifier followed by a digital divider. The limiting amp ensures that the flip-flop type divider is driven with a square wave over a wide range of input levels. Because the flip-flop uses the rising and falling edges of the limiter output, the quadrature accuracy of the Carrier supplied to the mixers is directly related to the duty cycle, or equivalently to the even harmonic content, of the input LO signal. In particular, care should be taken to ensure that the 2xLO level input to this pin is at least 20dB below the LO level. Otherwise, the LO input is not sensitive to the type of input wave form, except for IF frequencies below ~2.5MHz, in which case the LO input should be a square wave, in order to ensure proper triggering of the flipflops. IF frequencies below 100kHz are attainable if the LO is a square wave and sufficiently large DC blocking capacitors are used. Voltage supply for the entire device. This pin should be well bypassed at all frequencies (IF, LO, Carrier, Baseband) that are present in the part.
Interface Schematic
VCC VCC
500 LO IN
500
14
VCC
Rev A5 DS061016
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RF2713
Pin 1 Function I INPUT A Description (Modulator Configuration)
When the RF2713 is configured as a Quadrature Modulator, each mixer is driven by an independent baseband modulation channel (I and Q). The mixers can be driven single-endedly (as shown in the modulator application circuit) or differentially. When driving single-endedly, the B Inputs (pins 2 and 4) should be connected to each other. This ensures that the baseband signals will reach each mixer with the same DC reference, yielding the best carrier suppression. Note that the input impedance changes according to the drive mode (see the mixer equivalent circuit on the previous page). The single-ended input impedance (as shown in the modulator application circuit) is 1200 for each of the two inputs. In the balanced configuration, the input impedance would be 2400 for each of the two inputs. The mixers are Gilbert Cell designs with balanced inputs. The equivalent schematic for one of the mixers is shown on the previous page. The input impedance of each pin is determined by the 1200 resistor to VCC in parallel with a transistor base. Note from the schematic that all four input pins have an internally set DC bias. For this reason, all four inputs (pins 1 through 4) should be DC blocked. The capacitance values of the blocking capacitors is determined by the baseband frequency. When driving single-endedly, both the series (pins 1 and 3) and shunt (pins 2 and 4) blocking capacitors should be low impedances, relative to the input impedance. DC bias voltages may be supplied to the inputs pins, if required, in order to increase the amount of carrier suppression. For example, the DC levels on the reference inputs (pins 2 and 4) may be offset from each other by adding different resistor values to ground. These resistors should be larger than 2k. Note from the mixer schematic that all four input pins have an internally set DC bias. If DC bias is to be supplied, the allowable ranges are limited. For 5V applications, the DC reference on both I pins or both Q pins must not go below 2.7VDC, and in no case should the DC voltage on any of the four pins go below 2.0VDC or above 5.5VDC. IF a DC reference is to be supplied, the source must also be capable of sinking current. If optimizing carrier suppression further is not a concern, it is recommended that all four inputs (pins 1 through 4) be DC blocked. Same as pin 1, except complementary input. Same as pin 1, except Q Buffer Amplifier. Same as pin 3, except complementary input. Band Gap voltage reference output. This voltage output is held constant over variations in supply voltage and operating temperature and may be used as a reference for other external circuitry. This pin should not be loaded such that the sourced current exceeds 1mA. This pin should be bypassed with a large (0.1F) capacitor. Connecting pins 6 and 7 to each other accomplishes the summing function of the upconverted I and Q channels. In addition, because these outputs are open collector type, they must be connected to VCC in order to properly bias the Gilbert Cell mixers. Maximum gain and output power occur when the load on these two pins is ~1200. In most applications the impedance of the next stage will be lower and a reactive impedance transforming match should be used if maximum gain and output level are of concern. For applications where the gain is not as critical, a 1200 resistor may be added in parallel with a choke inductor. If neither gain nor output level is critical, the inductor may be replaced with a resistor that sets the desired source impedance to drive the next stage. If the next stage is an "open" at DC, the blocking capacitor may be eliminated.
Interface Schematic
VCC VCC
1260 INPUT A
1260 INPUT B
2 3 4 5
I INPUT B Q INPUT A Q INPUT B BG OUT
See pin 1. See pin 1. See pin 1.
6
I IF OUT
IF OUT
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Rev A5 DS061016
RF2713
Pin 7 8 Function Q IF OUT Q OUT Description (Modulator Configuration)
Same as pin 6, except complementary input. Pins 8 and 9 are not used in a normal quadrature modulator application, and are left unconnected. Note, however, that the outputs of each of these pins are independent upconverted I and Q channels. These signals may be useful in other applications where independent IF channels are needed. Also note that these outputs are optimized as baseband outputs for the demodulator configuration. As a result, the gain rolls-off quickly with increasing frequency. This gain roll-off will limit the usefulness of these pins as independent I and Q upconverters. If these outputs are to be used, please refer to the Demodulator pin descriptions regarding load impedances. Same as pin 8, except Q Mixer's Output. Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. Same as pin 10. Same as pin 10. High impedance, single-ended modulator LO input. The LO applied to this pin is frequency divided by a factor of 2 and becomes the "Carrier". For modulation, the Carrier is the center of the modulated output spectrum (except in the case of SSB/SC). The input impedance is determined by an internal 500 bias resistor to VCC. An external blocking capacitor should be provided if the pin is connected to a device with DC present. Matching the input impedance is typically achieved by adding a 51 resistor to ground on the source side of the AC coupling capacitor. For the LO input, maximum power transfer is not critical. The internal LO switching circuits are controlled by the voltage, not power, into the part. In cases where the LO source does not have enough available voltage, a reactive match (voltage transformer) can be used. The LO circuitry consists of a limiting amplifier followed by a digital divider. The limiting amp ensures that the flip-flop type divider is driven with a square wave over a wide range of input levels. Because the flip-flop uses the rising and falling edges of the limiter output, the quadrature accuracy of the Carrier supplied to the mixers is directly related to the duty cycle, or equivalently to the even harmonic content, of the input LO signal. In particular, care should be taken to ensure that the 2xLO level input to this pin is at least 20dB below the LO level. Otherwise, the LO input is not sensitive to the type of input wave form, except for IF frequencies below ~2.5MHz, in which case the LO input should be a square wave, in order to ensure proper triggering of the flip-flops. IF frequencies below 100kHz are attainable if the LO is a square wave and sufficiently large DC blocking capacitors are used. Voltage supply for the entire device. This pin should be well bypassed at all frequencies (IF, LO, Carrier, Baseband) that are present in the part.
VCC VCC
Interface Schematic
Same as pin 6.
VCC
I/Q OUT 2 k
9 10 11 12 13
I OUT GND GND GND LO INPUT
Same as pin 8.
500 LO IN
500
14
VCC
Rev A5 DS061016
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RF2713
Gilbert Cell Mixer Equivalent Circuit
IF+ IF-
LO/2+ LO/2-
I/Q INPUT B I/Q INPUT A
Package Drawing
0.157 0.150
0.018 0.014
0.008 0.004
0.337 0.334 0.050
0.244 0.229
0.068 0.053
8 MAX 0 MIN 0.034 0.016 0.009 0.007
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Rev A5 DS061016
RF2713
Application Schematic - Demodulator Configuration
VCC 10 nF IF IN 51 1 2 3 10 nF 4 10 nF 5 6 7 10 9 8 I OUT Q OUT 11 QUAD DIV. BY 2 14 100 nF 13 12 51 LO 100 nF
VCC
Application Schematic - Modulator Configuration
VCC BASEBAND I 51 100 nF 3 51 100 nF 4 100 nF 5 6 IF OUT 7 1 K VCC 10 9 8 11 100 nF 1 2 QUAD DIV. BY 2 14 10 nF 13 12 51 LO 100 nF
BASEBAND Q
10 nF
Rev A5 DS061016
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RF2713
Evaluation Board Schematic - Demodulator Configuration
(Download Bill of Materials from www.rfmd.com.)
C5 0.1 uF
J1 IF IN
50 strip
C1 0.1 uF 1 R1 50 2 3 4 5 6 7 P1 1 2 NC GND VCC
2713401-
14 QUAD DIV. BY 2 13 12 11 10 9 8 50 strip 50 strip 50 strip C4 0.1 uF R2 50
VCC J4 LO
C2 0.1 uF
C3 0.1 uF VCC
J3 I OUT J2 Q OUT
P1-3
3 CON3
Evaluation Board Schematic - Modulator Configuration
C1 0.1 uF 1 R2 50 C2 0.1 uF C3 0.1 uF R1 50 2 3 4 5 C4 0.1 uF 6 7 R3 1 k
2713400-
C6 0.1 uF
J1 I
50 strip
14 QUAD DIV. BY 2 13 12 11 P1 10 9 8 P1-1 1 2 3 CON3 50 strip C5 0.1 uF R4 50
VCC J4 LO
J2 Q
50 strip
VCC GND NC
J3 IF OUT
50 strip
VCC
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Rev A5 DS061016
RF2713
Evaluation Board Layout Demodulator Configuration (2713 PCBA-D) Board Size 2.0" x 2.0"
Board Thickness 0.031", Board Material FR-4
Rev A5 DS061016
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RF2713
Evaluation Board Layout Modulator Configuration (2713 PCBA-M) Board Size 2.0" x 2.0"
Board Thickness 0.031", Board Material FR-4
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Rev A5 DS061016
RF2713
25.0
I Channel Gain versus Baseband Frequency VCC=5.0V, FIF=132MHz, ZIN=50 Shunt R
25.0
I Channel Gain versus Baseband Frequency VCC=5.0V, FIF=265MHz, ZIN=50 Shunt R
-40C
24.5
24.5
+25C +85C
24.0
24.0
Gain (dB)
23.5
Gain (dB)
-40C +25C +85C 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
23.5
23.0
23.0
22.5
22.5
22.0
22.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
Baseband Frequency (MHz)
Baseband Frequency (MHz)
Q Channel Gain versus Baseband Frequency, VCC=5.0V, FIF=132MHz, ZIN=50 Shunt R 25.0
25.0
Q Channel Gain versus Baseband Frequency VCC=5.0V, FIF=265MHz, ZIN=50 Shunt R
-40C
24.5
24.5
+25C +85C
24.0
24.0
Gain (dB)
23.5
Gain (dB)
-40C +25C +85C 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
23.5
23.0
23.0
22.5
22.5
22.0
22.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
Baseband Frequency (MHz)
Baseband Frequency (MHz)
0.0 -0.5 -1.0 -1.5
Phase Error versus Baseband Frequency VCC=5.0V, FIF=132MHz, ZIN=50 Shunt R
0.0 -0.5 -1.0 -1.5
Phase Error versus Baseband Frequency VCC=5.0V, FIF=265MHz, ZIN=50 Shunt R
Phase Error (dB)
-2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 -40C +25C +85C
Phase Error (dB)
-2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 -40C +25C +85C
Baseband Frequency (MHz)
Baseband Frequency (MHz)
Rev A5 DS061016
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RF2713
0.35
Amplitude Balance versus Baseband Frequency VCC=5.0V, FIF=132MHz, ZIN=50 Shunt R
0.35
Amplitude Balance versus Baseband Frequency VCC=5.0V, FIF=265MHz, ZIN=50 Shunt R
0.30
0.30
0.25
0.25
Gain (dB)
0.15
Gain (dB)
-40C
0.20
0.20
0.15
0.10
0.10 -40C 0.05 +25C +85C 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00
0.05
+25C +85C
0.00 0.00
Baseband Frequency (MHz)
Baseband Frequency (MHz)
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Rev A5 DS061016
RF2713
Rev A5 DS061016
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2713
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Rev A5 DS061016

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