MAX4309 查看數據表（PDF） - Maxim Integrated
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MAX4309 Datasheet PDF : 12 Pages
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400MHz, Ultra-Low-Distortion Op Amps
Driving Capacitive Loads
The MAX4108/MAX4109/MAX4308/MAX4309 are opti-
mized for AC performance. They are not designed to
drive highly reactive loads. Reactive loads will
decrease phase margin and may produce excessive
ringing and oscillation. Figure 1a shows a circuit that
eliminates this problem, and Figure 1b is a graph of the
optimal isolation resistor (RS) vs. capacitive load.
Figures 2a–2d show how a capacitive load causes
excessive peaking of the amplifier’s bandwidth if the
capacitive load is not isolated (RS) from the amplifier. A
small isolation resistor (usually 15Ω to 22Ω) placed
12
10 RS = 0Ω
AVCL = +1
8
CL = 15pF
6
CL = 10pF
4
2
0
-2
CL = 5pF
-4
-6
-8
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 2a. MAX4108 Response vs. Capacitive Load—No
Resistive (RS) Isolation (circuit shown in Figure 1a)
20
18 RS = 0Ω
AVCL = +2
16
CL = 15pF
14
12
10
CL = 10pF
8
6
4
2
CL = 5pF
0
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 2b. MAX4109 Response vs. Capacitive Load—No
Resistive (RS) Isolation (circuit shown in Figure 1a)
4
3
RS = 0Ω
AVCL = +5
2
1
CL = 15pF
0
-1
-2
-3
CL = 10pF
-4
-5
-6
0.1
CL = 5pF
1
10
100
1000
FREQUENCY (MHz)
4
3 RS = 0Ω
AVCL = +10
2
1
CL = 15pF
0
-1
-2
-3
CL = 5pF
-4
CL = 10pF
-5
-6
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 2c. MAX4308 Response vs. Capacitive Load—No
Resistive (RS) Isolation (circuit shown in Figure 1a)
Figure 2d. MAX4309 Response vs. Capacitive Load—No
Resistive (RS) Isolation (circuit shown in Figure 1a)
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