Tektronix FG 5010 User Manual

П
n
П
n
1
П
n
7
7
П
n
1
C
TRIGGER
(
U1730-9 )
SELECTED
SQWV
(
U1732-9
)
U1720B
-
6
REV
JUL
1982
U1730B
- 15
U1732A - 2
U1720A - 3
TRIGGER
( U1730-9 )
SELECTED
SQWV
(
U1732-9
)
U1730B - 15
U1730A
- 2
U1720A - 3
TØ
T I
T1 T2 T3
Main Loop .
Finally , at t8 , the
signals
coincide
, and at t9 ,
the
very
short pulses that
mark phase
tracking
begin
to
appear
,
and the inner
latches assume
the
detection
function
.
T
The output signal from U1720A is a bipolar drive signal
that
drives one
half of
the
Charge
Pump
.
The
output
of
U1720C is a similar signal that drives the other half of the
Charge Pump . From pin 3 of U1730A and pin 14 of U1732B ,
two signals are applied from the Phase Detector Logic to
the Lock
Detector
circuit . As
long as the
inner latches
con
trol the phase - lock process , both of these output lines stay
high , and the CPU is informed that the signals are locked . If
either
of
the
outer
latches sets , that
output
line
goes low
to
warn the CPU that the signals are no longer locked
together .
[ ]
Fig . 4-16 .
Phase
Detector
Logic signals
while
locking
on .
T4
11
[
1
|
T5 T6
1
|
T7
Theory
of
Operation
-
FG 5010
1
1
T8
|
1
1
T9
Fig . 4-17 .
Phase
Detector
Logic
signals when
trigger is
more than
twice
square
-
wave
frequency
.
|
3467-39A
3467-23A
In the absence of a trigger , U1310F holds U1730A reset
to
force the
Main Loop
frequency
down , to
prevent
phase
detector
lock
up
.
Lock
Detector
This circuit
operates
off the
drive from the
frequency
de
tector portion of the Phase Detector Logic circuits . The cir
cuit is a positive AND - gate that is formed by Q1840 , Q1842 ,
and Q1834 .
When both
inputs of the
gate are high ,
neither
Q1842 nor
Q1840
conduct . All of
the
current
through
R1836 , therefore , passes through Q1834 and R1835 , and
the
output is high ,
indicating that the
trigger
and
square
wave signals are locked . If Q1842 or Q1840 conduct , the
current through R1836 is diverted from Q1834 and the out
put goes low . The output from this stage is fed to the Fre
quency Control Logic gates , depicted on Diagram 19 .
4-39

Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English