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參數(shù)資料
| 型號： | AD8002 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual 600 MHz, 50 mW Current Feedback Amplifier(600MHz,50mW雙電流反饋放大器) |
| 中文描述： | 雙600兆赫，50毫瓦電流反饋放大器（頻率600MHz，50mW的雙電流反饋放大器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 507K |
| 代理商： | AD8002 |
9
REV. B
AD8002
–11–
Driving Capacitive Loads
T he AD8002 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, best
frequency response is obtained by the addition of a small series
resistance as shown in Figure 42. T he accompanying graph
909
R
SERIES
R
L
500
I
N
C
L
Figure 42. Driving Capacitive Loads
shows the optimum value for R
SERIES
vs. capacitive load. It is
worth noting that the frequency response of the circuit when
driving large capacitive loads will be dominated by the passive
roll-off of R
SERIES
and C
L
.
40
0
0
25
30
10
5
20
15
20
10
R
S
C
L
– pF
Figure 43. Recommended R
SERIES
vs. Capacitive Load
C ommunications
Distortion is a key specification in communications applications.
Intermodulation distortion (IMD) is a measure of the ability of
an amplifier to pass complex signals without the generation of
spurious harmonics. T he third order products are usually the
most problematic since several of them fall near the fundamen-
tals and do not lend themselves to filtering. T heory predicts that
the third order harmonic distortion components increase in
power at three times the rate of the fundamental tones. T he
specification of third order intercept as the virtual point where
fundamental and harmonic power are equal is one standard
measure of distortion performance. Op amps used in closed-
loop applications do not always obey this simple theory. At a
gain of two, the AD8002 has performance summarized in Fig-
ure 44. Here the worst third order products are plotted vs. input
power. T he third order intercept of the AD8002 is +33 dBm at
10 MHz.
–80
3
–7
–75
2
1
0
–4
–5
6
–2
–70
–65
–60
–55
–50
–45
–1
T
INPUT POWER – dBm
2F
2
– F
1
2F
1
– F
2
G = +2
F
1
= 10MHz
F
2
= 12MHz
–6
–8
4
5
–3
Figure 44. Third Order IMD; F
1
= 10 MHz, F
2
= 12 MHz
Operation as a Video Line Driver
T he AD8002 has been designed to offer outstanding perfor-
mance as a video line driver. T he important specifications of
differential gain (0.01%) and differential phase (0.02
°
) meet the
most exacting HDT V demands for driving one video load with
each amplifier. T he AD8002 also drives four back terminated
loads (two each), as shown in Figure 45, with equally impressive
performance (0.01%, 0.07
°
). Another important consideration
is isolation between loads in a multiple load application. T he
AD8002 has more than 40 dB of isolation at 5 MHz when driv-
ing two 75
back terminated loads.
750
750
75
CABLE
75
75
V
OUT
#1
V
OUT
#2
+V
S
–V
S
V
IN
0.1
μ
F
4.7
μ
F
1/2
AD8002
3
2
8
0.1
μ
F
4.7
μ
F
4
75
CABLE
75
75
1
75
CABLE
75
75
V
OUT
#3
V
OUT
#4
75
CABLE
75
75
1/2
AD8002
750
750
75
CABLE
75
+
6
5
7
Figure 45. Video Line Driver
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