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參數資料
| 型號： | AD8021ARZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Noise, High Speed Amplifier for 16-Bit Systems |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件頁數： | 19/20頁 |
| 文件大小： | 467K |
| 代理商： | AD8021ARZ |
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, C
C
, which reduces the peaking while maintaining
gain flatness at low frequencies. The second technique is to add a
resistor, R
SNUB
, in series between the output pin of the AD8021
and the capacitive load, C
L
. Figure 15 shows the response of the
AD8021 when both C
C
and R
SNUB
are used to reduce peaking.
For a given C
L
, Figure 16 can be used to determine the value of
R
SNUB
that maintains 2 dB of peaking in the frequency response.
Note, however, that using R
SNUB
attenuates the low frequency
output by a factor of R
LOAD
/(R
SNUB
+ R
LOAD
).
C
C
= 7pF;
R
SNUB
= 0
C
C
= 8pF;
R
SNUB
= 0
0.1
1000
10
100
FREQUENCY – MHz
G
18
16
14
12
10
8
6
4
2
0
C
C
= 8pF;
R
SNUB
= 17.4
499
499
R
L
1k
49.9
49.9
C
C
33pF
FET
PROBE
–V
S
R
SNUB
+V
S
5
6
1.0
Figure 15. Peaking vs. R
SNUB
and C
C
for C
L
= 33 pF
CAPACITIVE LOAD – pF
0
50
R
S
20
18
16
14
12
10
8
6
4
2
0
5
10
15
20
25
30
35
40
45
Figure 16. Relationship of R
SNUB
vs. C
L
for 2 dB
Peaking at a Gain of +2
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