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| 型號： | AD8054ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Cost, High Speed Rail-to-Rail Amplifiers |
| 中文描述： | VIDEO AMPLIFIER, PDSO14 |
| 封裝： | MO-153AB-1, TSSOP-14 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 267K |
| 代理商： | AD8054ARU |
AD8051/AD8052/AD8054
–12–
REV. B
Overdrive Recovery
Overdrive of an amplifier occurs when the output and/or input
range are exceeded. The amplifier must recover from this over-
drive condition. As shown in Figure 36, the AD8051/AD8052/
AD8054 recovers within 60ns from negative overdrive and
within 45ns from positive overdrive.
Figure 36.Overdrive Recovery
Driving Capacitive Loads
Consider the AD8051/AD8052 in a closed-loop gain of +1 with
+V
S
= 5 V and a load of 2 k
in parallel with 50 pF. Figures 37
and 38 show its frequency and time domain responses, respec-
tively, to a small-signal excitation. The capacitive load drive of
the AD8051/AD8052/AD8054 can be increased by adding a
low valued resistor in series with the load. Figures 39 and 40
show the effect of a series resistor on capacitive drive for varying
voltage gains. As the closed-loop gain is increased, the larger
phase margin allows for larger capacitive loads with less peak-
ing. Adding a series resistor with lower closed-loop gains ac-
complishes the same effect. For large capacitive loads, the
frequency response of the amplifier will be dominated by the
roll-off of the series resistor and the load capacitance.
FREQUENCY – MHz
500
0.1
1
10
100
V
= +5V
G = +1
R
L
= 2k
V
C
L
= 50pF
V
O
= 200mV p-p
8
6
4
2
0
2
2
2
4
2
6
2
8
2
10
G
Figure 37. AD8051/AD8052 Closed-Loop Frequency
Response: C
L
= 50 pF
2.60
2.55
2.50
2.45
2.40
Figure 38. AD8051/AD8052 200 mV Step Response:
C
L
= 50 pF
V
S
= +5V
30%
OVERSHOOT
R
S
= 3
V
R
S
= 0
V
R
G
R
F
C
L
R
S
V
OUT
V
100mV STEP
50
V
10000
1000
11
6
2
C
2
P
F
3
4
5
100
10
A
CL
– V/V
Figure 39. AD8051/AD8052 Capacitive Load Drive vs.
Closed-Loop Gain
V
S
= +5V
#
30%
OVERSHOOT
R
G
R
F
C
L
R
S
V
OUT
V
100mV STEP
50
V
R
S
= 10
V
R
S
= 0
V
A
CL
– V/V
1000
100
10
1
6
2
3
4
5
C
Figure 40. AD8054 Capacitive Load Drive vs. Closed-Loop
Gain
Circuit Description
The AD8051/AD8052/AD8054 is fabricated on Analog Devices’
proprietary eXtra-Fast Complementary Bipolar (XFCB) pro-
cess, which enables the construction of PNP and NPN transis-
tors with similar f
T
s in the 2 GHz–4 GHz region. The process is
dielectrically isolated to eliminate the parasitic and latch-up
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