10

FIGURE 10A. CIRCUIT

Top Trace: Output at junction of 2.7

Ω 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

5.1k

Ω

10k

Ω

2.7k

Ω

6

7

4

2

5

-15V

13k

Ω

+15V

CENTERING

10k

Ω

-15V

910k

Ω

62k

Ω

11k

Ω

10k

Ω

EXTERNAL

OUTPUT

11k

Ω

HIGH

FREQUENCY

LEVEL

7-60pF

EXTERNAL

OUTPUT

TO OUTPUT

AMPLIFIER

OUTPUT

AMPLIFIER

TO

SINE WAVE

SHAPER

2k

Ω

FREQUENCY

ADJUSTMENT

HIGH

FREQ.

SHAPE

SYMMETRY

THIS NETWORK IS USED WHEN THE

OPTIONAL BUFFER CIRCUIT IS NOT USED

-15V

+15V

10k

Ω

120

Ω

39k

Ω

100k

Ω

3

6

3

2

4

7

7.5k

Ω

+15V

+15V

15k

Ω

360

Ω

360

Ω

2M

Ω

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

51

Ω

WIDEBAND

LINE DRIVER

SWEEP

GENERATOR

GATE

SWEEP

V-

SWEEP

LENGTH

EXTERNAL

INPUT

OFF

V-

COARSE

RATE

FINE

RATE

EXT.

INT.

CA3140, CA3140A