CA3240_05 Datasheet, PDF (5/15 Pages) Intersil Corporation – Dual, 4.5MHz, BiMOS Operational Amplifier with MOSFET Input/Bipolar Output

CA3240, CA3240A
Test Circuits and Waveforms (Continued)
+15V
R_S
1MΩ
+
CA3240
-
-15V
0.01µF
NOISE
VOLTAGE
OUTPUT
30.1kΩ
0.01µF
BW (-3dB) = 140kHz
1kΩ
TOTAL NOISE VOLTAGE
(REFERRED TO INPUT) = 48µV (TYP)
FIGURE 2. TEST CIRCUIT AMPLIFIER (30dB GAIN) USED FOR WIDEBAND NOISE MEASUREMENT
Schematic Diagram (One Amplifier of Two)
BIAS CIRCUIT
Q₁
Q₇
R₁
8K
D₁
Q₆
Q₈
D₂
INVERTING
INPUT
-
NON-INVERTING
INPUT +
INPUT STAGE
Q₂
Q₅
D₃
D₄
D₅
SECOND STAGE OUTPUT STAGE
D₇
R₉
Q₃
50Ω
R₁₀
Q_{19 1K}
Q₄
R₁₁
20Ω
Q₁₇
R₈
1K
Q₁₈
DYNAMIC CURRENT SINK
V+
R₁₃
15K
Q₂₀
D₈
R₁₂
R₁₄
12K
20K
Q₂₁
OUTPUT
Q₉ ^Q10
R₂
500Ω
Q₁₁
R₃
500Ω
Q₁₂
R₄
500Ω
R₅
500Ω
C₁
12pF
Q₁₃
Q₁₄
Q₁₅
Q₁₆
D₆
R₆
R₇
50Ω
30Ω
V-
NOTES:
9. All resistance values are in ohms.
5
FN1050.6
March 4, 2005