AD822B 查看數據表（PDF） - Analog Devices

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AD822B

Dual/ 16 MHz/ Rail-to-Rail FET Input Amplifier

Analog Devices 

20mV

2µs

100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

90

10

0% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 44. Small Signal Response of AD822 as

Unity Gain Follower Driving 350 pF

Figure 45 is a plot of capacitive load that results in a 20° phase

margin vs. noise gain for the AD822. Noise gain is the inverse of

the feedback attenuation factor provided by the feedback

network in use.

5

4

3

2

1

300

1k

3k

10k

30k

CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF)

AD822

Figure 46 shows a method for extending capacitance load drive

capability for a unity gain follower. With these component

values, the circuit drives 5000 pF with a 10% overshoot.

+VS 0.01µF

8

VIN

+ 1/2

100Ω

AD822

VOUT

–

4

0.01µF

CL

–VS

20pF

20kΩ

Figure 46. Extending Unity Gain Follower Capacitive Load Capability

Beyond 350 pF

RF

CL

R1

Figure 45. Capacitive Load Tolerance vs. Noise Gain

Rev. G | Page 21 of 28

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