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UCT UCT Semiconductor D ROD TE P TE PRO E SOL STITU 09 OB SUB FA11 IBLE A1100, H S POS HF
HFA1102
January 1999 File Number 3597.4
600MHz Current Feedback Amplifier with Compensation Pin Description
[ /Title amplifier featuring a compensation pin for bandwidth limiting. (HFA11 Built with Harris' proprietary complementary bipolar UHF-1 process, it has excellent AC performance and low distortion. 02) /SubBecause the HFA1102 is already unity gain stable, the primary purpose for limiting the bandwidth is to reduce the ject (broadband) of the 600MH total noise may be limited the circuit. The bandwidth of and HFA1102 by connecting a capacitor Cur- series damping resistor from pin 8 to ground. Typical bandwidths for various values of compensation capacitors ent are shown in the Electrical Specifications section of this eeddatasheet. ack mpli- A variety of packages and temperature grades are available. See the ordering information below for details. er with omPart Number Information ensaPART NUMBER TEMP. PKG. ion Pin) (BRAND) RANGE (oC) PACKAGE NO. /Author HFA1102IB -40 to 85 8 Ld SOIC M8.15 ) (H1102I) /KeyHFA11XXEVAL DIP Evaluation Board for High Speed Op Amps ords Harris Pinout HFA1102 emi(SOIC) onducTOP VIEW or, ingle, 8 COMP NC 1 ideo 7 V+ -IN 2 pera+ 6 OUT +IN 3 ional 5 NC V- 4 mplier, op mp, igh peed ideo, igh lew ate, 5V ingle upply,
The HFA1102 is a high speed wideband current feedback
Features
* Compensation Pin for Bandwidth Limiting * Low Distortion (HD2 at 30MHz) . . . . . . . . . . . . . . . -56dBc * -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 600MHz * Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . . 2000V/s * Fast Settling Time (0.1%) . . . . . . . . . . . . . . . . . . . . . 11ns * Excellent Gain Flatness - (100MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05dB - (50MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02dB - (30MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01dB * High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA * Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns
Applications
* Low Noise Amplifiers * Video Switching and Routing * Pulse and Video Amplifiers * RF/IF Signal Processing * Flash A/D Driver * Medical Imaging Systems
The Op Amps with Fastest Edges
INPUT 220MHz SIGNAL
OUTPUT (AV = 2) HFA1102 OP AMP 0ns 25ns
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright (c) Harris Corporation 1999
HFA1102
Absolute Maximum Ratings
Voltage Between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V Output Current (50% Duty Cycle) . . . . . . . . . . . . . . . . . . . . . . 60mA
Thermal Information
Thermal Resistance (Typical, Note 1) JA (oC/W) JC (oC/W) SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. JA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
VSUPPLY = 5V, AV = +1, RF = 510, RL = 100, CCOMP = 0pF, Unless Otherwise Specified TEST CONDITIONS TEMP. (oC) MIN TYP MAX UNITS
PARAMETER INPUT CHARACTERISTICS Input Offset Voltage
25 Full
40 38 45 42 25 2.5 -
2 10 46 50 25 40 20 12 40 1 6 50 16 2 3.0 4 18 21
6 10 40 65 40 50 50 60 7 10 15 27 30 -
mV mV V/oC dB dB dB dB A A nA/oC A/V A/V A A nA/oC A/V A/V A/V A/V k pF V nV/Hz pA/Hz pA/Hz
Input Offset Voltage Drift VIO CMRR VCM = 2V
Full 25 Full
VIO PSRR
VS = 1.25V
25 Full
Non-Inv. Input Bias Current
+IN = 0V
25 Full
+IBIAS Drift +IBIAS CMS VCM = 2V
Full 25 Full
Inv. Input Bias Current
-IN = 0V
25 Full
-IBIAS Drift -IBIAS CMS VCM = 2V
Full 25 Full
-IBIAS PSS
VS = 1.25V
25 Full
Non-Inv. Input Resistance Inv. Input Resistance Input Capacitance Input Common Mode Range Input Noise Voltage +Input Noise Current -Input Noise Current TRANSFER CHARACTERISTICS Open Loop Transimpedance 100kHz 100kHz 100kHz Either Input
25 25 25 Full 25 25 25
AV = +1, RF = 150, RDAMP = 120, Unless Otherwise Specified 25 500 k
2
HFA1102
Electrical Specifications
VSUPPLY = 5V, AV = +1, RF = 510, RL = 100, CCOMP = 0pF, Unless Otherwise Specified (Continued) TEST CONDITIONS DC to 100MHz NTSC, RL = 75 NTSC, RL = 75 TEMP. (oC) 25 25 25 Full CCOMP = 0pF CCOMP = 1pF CCOMP = 3pF CCOMP = 7pF Gain Flatness (To 30MHz) CCOMP = 0pF CCOMP = 1pF CCOMP = 3pF Gain Flatness Gain Flatness To 100MHz To 50MHz 25 25 25 25 25 25 25 25 25 MIN 1 TYP 0.6 0.03 0.03 600 350 190 55 0.01 0.05 0.10 0.05 0.02 MAX UNITS Degrees % Degrees V/V MHz MHz MHz MHz dB dB dB dB dB
PARAMETER Linear Phase Deviation Differential Gain Differential Phase Minimum Stable Gain Bandwidth Limiting Characteristics -3dB Bandwidth (VOUT = 0.2VP-P, AV = +1)
OUTPUT CHARACTERISTICS AV = +2, Unless Otherwise Specified Output Voltage AV = -1 25 Full Output Current RL = 50, AV = -1 25 Full Closed Loop Output Impedance 2nd Harmonic Distortion 3rd Harmonic Distortion 3rd Order Intercept 1dB Compression TRANSIENT RESPONSE Rise Time Overshoot Slew Rate DC 30MHz, VOUT = 2VP-P 30MHz, VOUT = 2VP-P 100MHz 100MHz 25 25 25 25 25 3.0 2.5 50 40 3.3 3.0 65 60 0.1 -56 -80 30 20 V V mA mA dBc dBc dBm dBm
AV = +1, RF = 150, RDAMP = 120, Unless Otherwise Specified VOUT = 2.0V Step VOUT = 2.0V Step AV = +1, VOUT = 5VP-P AV = +2, VOUT = 5VP-P 25 25 25 25 25 25 600 10 1200 2000 11 7 ps % V/s V/s ns ns
0.1% Settling Time 0.2% Settling Time POWER SUPPLY CHARACTERISTICS Supply Voltage Range Supply Current
VOUT = 2V to 0V VOUT = 2V to 0V
Full 25 Full
4.5 -
21 -
5.5 26 33
V mA mA
3
HFA1102 Application Information
Optimum Feedback Resistor (RF)
All current feedback amplifiers require a feedback resistor, even for unity gain applications. The RF, in conjunction with the internal compensation capacitor, sets the dominant pole of the frequency response. Thus, the amplifier's bandwidth is inversely proportional to RF. The HFA1102 design is optimized for a 150 RF, at a gain of +1. Decreasing RF in a unity gain application decreases stability, leading to excessive peaking and overshoot. At higher gains the amplifier is more stable, so RF can be decreased in a trade-off of stability for bandwidth.
500 1 50 IN 2 3 4 10F 0.1F -5V GND 500 VH 8 7 50 6 5 GND OUT VL 0.1F 10F +5
Bandwidth Limiting
The bandwidth of the HFA1102 may be limited by connecting a resistor (RDAMP) and capacitor in series from pin 8 to GND. The series resister is required to damp the interaction between the package parasitics and CCOMP. Typical bandwidths for various values of compensation capacitor are shown in the specification tables. Because the HFA1102 is already unity gain stable, the main reason for limiting the bandwidth is to reduce the total noise (broadband) of the circuit. Additionally, compensating the HFA1102 allows the use of a lower value RF for a given gain. The decreased bandwidth due to CCOMP offsets the bandwidth increase from the lower RF, keeping the amplifier stable. Reducing RF provides the double benefits of reduced DC errors (-IB x RF) and reduced total noise (INI x RF and 4KTRF).
TOP LAYOUT
VH
1 +IN OUT VL VGND V+
BOTTOM LAYOUT
PC Board Layout
The frequency performance of this amplifier depends a great deal on the amount of care taken in designing the PC board. The use of low inductance components such as chip resistors and chip capacitors is strongly recommended, while a solid ground plane is a must! Attention should be given to decoupling the power supplies. A large value (10F) tantalum in parallel with a small value chip (0.1F) capacitor works well in most cases. Terminated microstrip signal lines are recommended at the input and output of the device. Output capacitance, such as that resulting from an improperly terminated transmission line will degrade the frequency response of the amplifier and may cause oscillations. In most cases, the oscillation can be avoided by placing a resistor in series with the output. Care must also be taken to minimize the capacitance to ground seen by the amplifier's inverting input. The larger this capacitance, the worse the gain peaking, resulting in pulse overshoot and possible instability. To this end, it is recommended that the ground plane be removed under traces connected to pin 2, and connections to pin 2 should be kept as short as possible. An example of a good high frequency layout is the Evaluation Board shown.
FIGURE 1. EVALUATION BOARD SCHEMATIC AND LAYOUT
600 60 6 0.6 GAIN (k) 0.06 CC = 3pF CC = 7pF CC = 0pF CC = 1pF PHASE CC = 3pF CC = 7pF 180 135 90 45 0 0.01 0.1 0.3 0.6 1 3 6 10 30 60 100 300 600 PHASE (DEGREES) AV = -1 CC = 0pF CC = 1pF
Evaluation Board
The HFA1102 may be evaluated using the HFA11XX Evaluation Board which is available from your local sales office (part number HFA11XXEVAL). RDAMP and CCOMP should be connected in series from the socket pin to the GND plane. The trace from pin 8 to the VH connector should be cut near the socket to remove this parallel capacitance.The layout and schematic of the board are shown below:
FREQUENCY (MHz)
FIGURE 2. OPEN LOOP TRANSIMPEDANCE FOR VARIOUS COMPENSATION CAPACITORS
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