CA3140, CA3140A
CENTERING
7.5kΩ
+15V
+15V
HIGH
-15V 10kΩ
FREQUENCY
+15V
360Ω
360Ω
2MΩ
SYMMETRY
-15V
3+
7
15kΩ
CA3080A 6
2-
4
7-60
pF
5
HIGH
-15V FREQ.
+15V
SHAPE
100kΩ
0.1 LEVEL
910kΩ
7
µF
7-60pF
3+
51
CA3140 6
pF 2 -
11kΩ
4
10kΩ 11kΩ
-15V
2kΩ
0.1
µF
EXTERNAL
OUTPUT
62kΩ
5
7
2-
CA3080 6
3+
4
13kΩ
-15V
10kΩ
EXTERNAL
OUTPUT
2.7kΩ
TO OUTPUT
AMPLIFIER
FROM BUFFER METER
DRIVER (OPTIONAL)
39kΩ
120Ω 10kΩ
FREQUENCY
ADJUSTMENT
5.1kΩ TO
SINE WAVE
-15V
+15V
OUTPUT
SHAPER
1N914
THIS NETWORK IS USED WHEN THE
AMPLIFIER
OPTIONAL BUFFER CIRCUIT IS NOT USED
FIGURE 10A. CIRCUIT
Top Trace: Output at junction of 2.7Ω and 51Ω resistors;
5V/Div., 500ms/Div.
Center Trace: External output of triangular function generator;
2V/Div., 500ms/Div.
Bottom Trace: Output of “Log” generator; 10V/Div., 500ms/Div.
FIGURE 10B. FIGURE FUNCTION GENERATOR SWEEPING
FREQUENCY
ADJUSTMENT
METER DRIVER
AND BUFFER
AMPLIFIER M
FUNCTION
GENERATOR
SINE WAVE
SHAPER
POWER
SUPPLY ±15V
+15V
-15V
WIDEBAND
LINE DRIVER
51Ω
FINE
RATE
SWEEP
GENERATOR
GATE DC LEVEL
SWEEP ADJUST
COARSE
RATE
OFF INT.
V- EXT.
EXTERNAL
INPUT
1V/Div., 1s/Div.
Three tone test signals, highest frequency ≥0.5MHz. Note the slight
asymmetry at the three second/cycle signal. This asymmetry is due to
slightly different positive and negative integration from the CA3080A
and from the PC board and component leakages at the 100pA level.
SWEEP
LENGTH
V-
FIGURE 10C. FUNCTION GENERATOR WITH FIXED
FREQUENCIES
FIGURE 10D. INTERCONNECTIONS
FIGURE 10. FUNCTION GENERATOR
10