CA3256
V
IN
= 200mV
P-P
, AT LOW FREQUENCY 0dB REF. EQUAL
1.13 x GAIN, T
A
= 25
o
C
0
7pF
C COMP
-2
1kΩ
GAIN (dB)
-4
8
R
F
1kΩ
V
OUT
+
9
220µF
TG
OUTPUT
AMPLIFIER
75Ω
-6
VIN
-8
-10
0.01
0.1
1
FREQUENCY (MHz)
10
100
FIGURE 4A. CLOSED LOOP RESPONSE WITH
COMPENSATION CAPACITOR, C
COMP
, AND R
F
,
SEE FIGURE 4B
FIGURE 4B. TEST CIRCUIT FOR FIGURE 4A
31
V
OUT
=
200mV
P-P
, T
A
=
25
o
C
29
8
27
GAIN (dB)
NO FEEDBACK
25
9
23
V IN
TG
21
+
OUTPUT
AMPLIFIER
220µF
V
OUT
150Ω
19
0.01
0.1
1
FREQUENCY (MHz)
10
100
FIGURE 4C. OPEN LOOP RESPONSE WITH NO FEEDBACK,
SEE FIGURE 4D
FIGURE 4D. TEST CIRCUIT FOR FIGURE 4C
FIGURE 4. FREQUENCY RESPONSE OF AC COUPLED CIRCUIT OF FIGURE 3
8-8