Wavetek 3000 - M29-1 - FM Reference; Current Sources

THEORY OF OPERATION
-A
A 2
WW~
Z= Q
<V0
O
r
CC rrZ
L- O
O
2 Q O
OU_cr
jr EiJ
W Zm
y~7
E- CC O
>>0
a
z
~
CC
O
2
4
8
10
20
40
80
100
200
400
800
3 .10 M29-1 - FM REFERENCE
Figure 3-14 . M172
Sweep Drive/DAC
TO MHz
STEPS
TO WIDE
VCO
The M29-1 is a voltage to frequency con-
verter, the output of which is used as
a phase lock reference in the M33 . The
module includes
a voltagevariable cur
rent source which feeds
(determines the

3 .10 .1 CurrentSources
frequency of) a square wave oscillator
.
(See Figure 3-15 .)

Zero volts in yields

This

circuit
provides

botha positive
2 MHz out .

and a negative source of current .

The