CA3140, CA3140A
CENTERING
10kΩ
+15V
-15V
HIGH
+15V
7.5kΩ
+15V
7
FREQUENCY
62kΩ
10kΩ
LEVEL
7-60pF
0.1
µF
910kΩ
360Ω
360Ω
3
2
+
7
15kΩ
5
EXTERNAL
OUTPUT
+
CA3080A
6
3
2
7
51
pF
-
CA3140
6
2
-
7-60
pF
4
11kΩ
10kΩ
6
CA3080
+
-
5
11kΩ
3
2MΩ
SYMMETRY
-15V
4
HIGH
2.7kΩ
4
-15V
0.1
µF
FREQ.
SHAPE
EXTERNAL
OUTPUT
+15V
-15V
2kΩ
-15V
13kΩ
TO OUTPUT
AMPLIFIER
100kΩ
FROM BUFFER METER
DRIVER (OPTIONAL)
FREQUENCY
ADJUSTMENT
5.1kΩ TO
120Ω 10kΩ
39kΩ
SINE WAVE
SHAPER
1N914
OUTPUT
AMPLIFIER
-15V
+15V
THIS NETWORK IS USED WHEN THE
OPTIONAL BUFFER CIRCUIT IS NOT USED
FIGURE 10A. CIRCUIT
FREQUENCY
ADJUSTMENT
Top Trace: Output at junction of 2.7Ω and 51Ω resistors;
5V/Div., 500ms/Div.
+15V
-15V
METER DRIVER
AND BUFFER
AMPLIFIER
Center Trace: External output of triangular function generator;
2V/Div., 500ms/Div.
POWER
SUPPLY ±15V
M
Bottom Trace: Output of “Log” generator; 10V/Div., 500ms/Div.
FIGURE 10B. FIGURE FUNCTION GENERATOR SWEEPING
FUNCTION
GENERATOR
WIDEBAND
LINE DRIVER
SINE WAVE
SHAPER
51Ω
DC LEVEL
ADJUST
GATE
SWEEP
SWEEP
GENERATOR
FINE
RATE
INT.
OFF
V-
EXTERNAL
INPUT
COARSE
RATE
EXT.
1V/Div., 1s/Div.
SWEEP
LENGTH
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.
V-
FIGURE 10C. FUNCTION GENERATOR WITH FIXED
FIGURE 10D. INTERCONNECTIONS
FREQUENCIES
FIGURE 10. FUNCTION GENERATOR
FN957.10
11
July 11, 2005
INTERSIL [ Intersil ]
