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AD8021 датащи(PDF) 19 Page - Analog Devices

номер детали AD8021
подробное описание детали  Low Noise, High Speed Amplifier for 16-Bit Systems
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8021 датащи(HTML) 19 Page - Analog Devices

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REV. D
AD8021
–19–
Driving Capacitive Loads
When the AD8021 drives a capacitive load, the high frequency
response may show excessive peaking before it rolls off. Two
techniques can be used to improve stability at high frequency and
reduce peaking. The first technique is to increase the compensa-
tion capacitor, CC, which reduces the peaking while maintaining
gain flatness at low frequencies. The second technique is to add a
resistor, RSNUB, in series between the output pin of the AD8021
and the capacitive load, CL. Figure 15 shows the response of the
AD8021 when both CC and RSNUB are used to reduce peaking.
For a given CL, Figure 16 can be used to determine the value of
RSNUB that maintains 2 dB of peaking in the frequency response.
Note, however, that using RSNUB attenuates the low frequency
output by a factor of RLOAD/(RSNUB + RLOAD).
CC = 7pF;
RSNUB = 0
CC = 8pF;
RSNUB = 0
0.1
1000
10
100
FREQUENCY – MHz
18
16
14
12
10
8
6
4
2
0
CC = 8pF;
RSNUB = 17.4
499
499
RL
1k
49.9
49.9
CC
33pF
FET
PROBE
–VS
RSNUB
+VS
5
6
1.0
Figure 15. Peaking vs. RSNUB and CC for CL = 33 pF
CAPACITIVE LOAD – pF
050
20
18
16
14
12
10
8
6
4
2
0
510
15202530354045
Figure 16. Relationship of RSNUB vs. CL for 2 dB
Peaking at a Gain of +2



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