Datasheet

11
FN957.10
July 11, 2005
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
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.
FIGURE 10C. FUNCTION GENERATOR WITH FIXED
FREQUENCIES
FIGURE 10D. INTERCONNECTIONS
FIGURE 10. FUNCTION GENERATOR
0.1
µF
1N914
6
7
4
2
3
0.1
µF
5.1kΩ
10kΩ
2.7kΩ
6
7
4
2
5
-15V
13kΩ
+15V
CENTERING
10kΩ
-15V
910kΩ
62kΩ
11kΩ
10kΩ
EXTERNAL
OUTPUT
11kΩ
HIGH
FREQUENCY
LEVEL
7-60pF
EXTERNAL
OUTPUT
TO OUTPUT
AMPLIFIER
OUTPUT
AMPLIFIER
TO
SINE WAVE
SHAPER
2kΩ
FREQUENCY
ADJUSTMENT
HIGH
FREQ.
SHAPE
SYMMETRY
THIS NETWORK IS USED WHEN THE
OPTIONAL BUFFER CIRCUIT IS NOT USED
-15V +15V
10kΩ120Ω
39kΩ
100kΩ
3
6
3
2
4
7
7.5kΩ
+15V+15V
15kΩ
360Ω
360Ω
2MΩ
7-60
pF
-15V
-15V
+15V
51
pF
+
CA3080A
-
CA3140
CA3080
+
-
+
-
5
-15V
FROM BUFFER METER
DRIVER (OPTIONAL)
FREQUENCY
ADJUSTMENT
METER DRIVER
AND BUFFER
AMPLIFIER
FUNCTION
GENERATOR
SINE WAVE
SHAPER
M
POWER
SUPPLY ±15V
-15V
+15V
DC LEVEL
ADJUST
51Ω
WIDEBAND
LINE DRIVER
SWEEP
GENERATOR
GATE
SWEEP
V-
SWEEP
LENGTH
EXTERNAL
INPUT
OFF
V-
COARSE
RATE
FINE
RATE
EXT.
INT.
CA3140, CA3140A