Specifications

SECTION
3
CIRCUIT DESCRIPTION
GENERAL DESCRIPTION
Refer to the block diagram of the Model 132
VCG/
Noise Generator, Figure 3-l.
Basically, a square wave is applied to the input of an
integrator composed of a wide-band differential dc
amplifier, integrating resistor and capacitor. Output
of the integrator is fed into the hysteresis switch.
The hysteresis and output switches function like a
Schmitt trigger with the limit points set at the
wave-
form extremes, firing when the triangle wave reaches
+1.25 volts and-1.25 volts. When firing occurs, the
hysteresis and output switches are set, reversing the
square wave fed into the integrator. Reversal of the
square wave causes the triangle wave to reverse direc-
VCG
VCG
Cl RCUIT
I
<
+5 v
POWER
SUPPLIES
+15 v
-15 v
HYSTERESIS
x
OUTPUT L
SWITCH
ATTENUATOR
I
.
.
9
b
MODE
SINE
%
+ CONVERTER
L
b SWITCHING 4
t
r
c CIRCUIT
FUNC
) SYNC
OUT
I
DIGITAL
I
I
FILTER
I
I
I
23
I
.
--~-~---~---
-_-
NOISE
l SYNC
b NOISE
CLOCK
Figure 3-l. Functional Block Diagram
11