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AD829ARZ Fiches technique(PDF) 15 Page - Analog Devices |
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AD829ARZ Fiches technique(HTML) 15 Page - Analog Devices |
15 / 20 page Data Sheet AD829 Rev. I | Page 15 of 20 Figure 44 and Figure 45 show the closed-loop frequency response of the AD829 for different closed-loop gains and different supply voltages. Figure 44. Closed-Loop Frequency Response for the Inverting Amplifier Using Current Feedback Compensation Figure 45. Closed-Loop Frequency Response vs. Supply for the Inverting Amplifier Using Current Feedback Compensation When a noninverting amplifier configuration using a current feedback compensation is needed, the circuit shown in Figure 46 is recommended. This circuit provides a slew rate twice that of the shunt compensated noninverting amplifier of Figure 47 at the expense of gain flatness. Nonetheless, this circuit delivers 95 MHz bandwidth with 1 dB flatness into a back-terminated cable, with a differential gain error of only 0.01% and a differential phase error of only 0.015 at 4.43 MHz. Figure 46. Noninverting Amplifier Connection Using Current Feedback Compensation Figure 47. Video Line Driver with a Flatness over Frequency Adjustment LOW ERROR VIDEO LINE DRIVER The buffer circuit shown in Figure 47 drives a back-terminated 75 Ω video line to standard video levels (1 V p-p), with 0.1 dB gain flatness to 30 MHz and with only 0.04° and 0.02% differential phase and gain at the 4.43 MHz PAL color subcarrier frequency. This level of performance, which meets the requirements for high definition video displays and test equipment, is achieved using only 5 mA quiescent current. FREQUENCY (MHz) 1 10 –15 –12 –9 –6 –3 0 3 6 9 12 15 100 GAIN = –4 CCOMP = 2pF GAIN = –2 CCOMP = 3pF GAIN = –1 CCOMP = 4pF VS = ±15V RL = 1kΩ RF = 1kΩ VIN = –30dBm FREQUENCY (MHz) 1 10 –47 –44 –41 –38 –35 –32 –29 –26 –23 –20 –17 100 ±5V ±15V VIN = –20dBm RL = 1kΩ RF = 1kΩ GAIN = –1 CCOMP = 4pF 3 2 7 6 4 5 + – AD829 +15V –15V 0.1 µF 3pF CCOMP 2k Ω 2k Ω 0.1 µF 50 Ω 50k Ω 50 Ω 50 Ω COAX CABLE 50 Ω COAX CABLE VIN VOUT 3 2 7 6 5 4 + – AD829 +15V 0.1 µF 30pF CCOMP –15V 0.1 µF 300 Ω 300 Ω 75 Ω 75 Ω 75 Ω 50 Ω COAX CABLE VIN VOUT OPTIONAL 2pF TO 7pF FLATNESS TRIM |
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