參數(shù)資料
型號(hào): AD829AR
廠商: ANALOG DEVICES INC
元件分類: 音頻/視頻放大
英文描述: High-Speed, Low-Noise Video Op Amp
中文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: PLASTIC, MS-012AA, SOIC-8
文件頁(yè)數(shù): 11/12頁(yè)
文件大小: 336K
代理商: AD829AR
AD829
REV. C
–11–
Figure 35. Closed-Loop Frequency Response vs. Supply
for the Inverting Amplifier Using Current Feedback
Compensation
A Low E rror Video Line Driver
T he buffer circuit shown in Figure 37 will drive a back-termi-
nated 75
video line to standard video levels (1 V p-p) with
0.1 dB gain flatness to 30 MHz with only 0.04
°
and 0.02% dif-
ferential phase and gain at the 4.43 MHz PAL color subcarrier
frequency. T his level of performance, which meets the require-
ments for high definition video displays and test equipment, is
achieved using only 5 mA quiescent current.
A High Gain, Video Bandwidth T hree Op Amp In Amp
Figure 38 shows a three op amp instrumentation amplifier cir-
cuit which provides a gain of 100 at video bandwidths. At a cir-
cuit gain of 100 the small signal bandwidth equals 18 MHz into
an FET probe. Small signal bandwidth equals 6.6 MHz with a
50
load. 0.1% settling time is 300 ns.
Figure 36. Noninverting Amplifier Connection Using
Current Feedback Compensation
Figure 37. A Video Line Driver with a Flatness over
Frequency Adjustment
T he input amplifiers operate at a gain of 20, while the output
op amp runs at a gain of 5. In this circuit the main bandwidth
limitation is the gain/ bandwidth product of the output ampli-
fier. Extra care needs to be taken while breadboarding this cir-
cuit, since even a couple of extra picofarads of stray capacitance
at the compensation pins of A1 and A2 will degrade circuit
bandwidth.
Figure 38. A High Gain, Video Bandwidth Three Op Amp In Amp Circuit
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