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AD829AR Datasheet(Fiches technique) 14 Page - Analog Devices

Numéro de pièce AD829AR
Description  High Speed, Low Noise Video Op Amp
Télécharger  20 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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AD829
Data Sheet
Rev. I | Page 14 of 20
Because the closed-loop bandwidth is a function of RF and
CCOMP (see Figure 39), it is independent of the amplifier closed-
loop gain, as shown in Figure 41. To preserve stability, the time
constant of RF and CCOMP needs to provide a bandwidth of
<65 MHz. For example, with CCOMP = 15 pF and RF = 1 kΩ, the
small signal bandwidth of the AD829 is 10 MHz. Figure 40
shows that the slew rate is in excess of 60 V/µs. As shown in
Figure 41, the closed-loop bandwidth is constant for gains of
−1 to −4; this is a property of the current feedback amplifiers.
Figure 39. Inverting Amplifier Connection Using Current Feedback
Compensation
Figure 40. Large Signal Pulse Response of Inverting Amplifier Using Current
Feedback Compensation, CCOMP = 15 pF, C1 = 15 pF RF = 1 kΩ, R1 = 1 kΩ
Figure 41. Closed-Loop Gain vs. Frequency for the Circuit of Figure 38
Figure 42 is an oscilloscope photo of the pulse response of a unity-
gain inverter that has been configured to provide a small signal
bandwidth of 53 MHz and a subsequent slew rate of 180 V/µs;
RF = 3 kΩ and CCOMP = 1 pF. Figure 43 shows the excellent pulse
response as a unity-gain inverter, this using component values
of RF = 1 kΩ and CCOMP = 4 pF.
Figure 42. Large Signal Pulse Response of the Inverting Amplifier Using
Current Feedback Compensation, CCOMP = 1 pF, RF = 3 kΩ, R1 = 3 kΩ
Figure 43. Small Signal Pulse Response of Inverting Amplified Using Current
Feedback Compensation, CCOMP = 4 pF, RF = 1 kΩ, R1 = 1 kΩ
2
3
7
6
4
+
AD829
+VS
–VS
0.1
µF
5
0.1
µF
C1*
50
50
COAX
CABLE
R1
CCOMP
RF
VOUT
RL
1k
VIN
IN4148
*RECOMMENDED VALUE
OF CCOMP FOR C1
<7pF
0pF
≥7pF
15pF
CCOMP SHOULD NEVER EXCEED
15pF FOR THIS CONNECTION
5V
200ns
0%
10
90
100%
FREQUENCY (Hz)
100k
1M
10M
–15
–12
–9
–6
–3
0
3
6
9
12
15
100M
GAIN = –4
–3dB @ 8.2MHz
GAIN = –2
–3dB @ 9.6MHz
GAIN = –1
–3dB @ 10.2MHz
VIN = –30dBm
VS = ±15V
RL = 1kΩ
RF = 1kΩ
CCOMP = 15pF
C1 = 15pF
5V
200ns
0%
10
90
100%
20mV
10ns
0%
10
90
100%




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