CA3256 Datasheet, PDF (8/11 Pages) Harris Corporation – 25MHz, BiMOS Analog Video Switch and Amplifier

CA3256
V_IN = 200mV_P-P, AT LOW FREQUENCY 0dB REF. EQUAL
1.13 x GAIN, T_A = 25^oC
0
-2
-4
-6
-8
8
1kΩ
7pF
C _COMP
R_F
1kΩ
VIN
TG
+
9
OUTPUT
AMPLIFIER
220µF
V_OUT
75Ω
-10
0.01
0.1
1
10
100
FREQUENCY (MHz)
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^oC
29
27
8
NO FEEDBACK
25
V_OUT
9
+
23
V _IN
220µF
150Ω
OUTPUT
TG
AMPLIFIER
21
19
0.01
0.1
1
10
100
FREQUENCY (MHz)
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