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AD829ARZ Fiches technique(PDF) 14 Page - Analog Devices |
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AD829ARZ Fiches technique(HTML) 14 Page - Analog Devices |
14 / 20 page AD829 Data Sheet Rev. I | Page 14 of 20 Because the closed-loop bandwidth is a function of RF and CCOMP (see Figure 39), it is independent of the amplifier closed- loop gain, as shown in Figure 41. To preserve stability, the time constant of RF and CCOMP needs to provide a bandwidth of <65 MHz. For example, with CCOMP = 15 pF and RF = 1 kΩ, the small signal bandwidth of the AD829 is 10 MHz. Figure 40 shows that the slew rate is in excess of 60 V/µs. As shown in Figure 41, the closed-loop bandwidth is constant for gains of −1 to −4; this is a property of the current feedback amplifiers. Figure 39. Inverting Amplifier Connection Using Current Feedback Compensation Figure 40. Large Signal Pulse Response of Inverting Amplifier Using Current Feedback Compensation, CCOMP = 15 pF, C1 = 15 pF RF = 1 kΩ, R1 = 1 kΩ Figure 41. Closed-Loop Gain vs. Frequency for the Circuit of Figure 38 Figure 42 is an oscilloscope photo of the pulse response of a unity- gain inverter that has been configured to provide a small signal bandwidth of 53 MHz and a subsequent slew rate of 180 V/µs; RF = 3 kΩ and CCOMP = 1 pF. Figure 43 shows the excellent pulse response as a unity-gain inverter, this using component values of RF = 1 kΩ and CCOMP = 4 pF. Figure 42. Large Signal Pulse Response of the Inverting Amplifier Using Current Feedback Compensation, CCOMP = 1 pF, RF = 3 kΩ, R1 = 3 kΩ Figure 43. Small Signal Pulse Response of Inverting Amplified Using Current Feedback Compensation, CCOMP = 4 pF, RF = 1 kΩ, R1 = 1 kΩ 2 3 7 6 4 – + AD829 +VS –VS 0.1 µF 5 0.1 µF C1* 50 Ω 50 Ω COAX CABLE R1 CCOMP RF VOUT RL 1k Ω VIN IN4148 *RECOMMENDED VALUE OF CCOMP FOR C1 <7pF 0pF ≥7pF 15pF CCOMP SHOULD NEVER EXCEED 15pF FOR THIS CONNECTION 5V 200ns 0% 10 90 100% FREQUENCY (Hz) 100k 1M 10M –15 –12 –9 –6 –3 0 3 6 9 12 15 100M GAIN = –4 –3dB @ 8.2MHz GAIN = –2 –3dB @ 9.6MHz GAIN = –1 –3dB @ 10.2MHz VIN = –30dBm VS = ±15V RL = 1kΩ RF = 1kΩ CCOMP = 15pF C1 = 15pF 5V 200ns 0% 10 90 100% 20mV 10ns 0% 10 90 100% |
Numéro de pièce similaire - AD829ARZ |
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Description similaire - AD829ARZ |
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