Tektronix FG 5010 User Manual

Theory of
Operation - FG 5010
SCHOIS
TRIG / CATE
4-18
FREE GATE
END OF
BURST
BURST
HF
SQ
HI RANGE
DATA
LF
SQ
HF
SQ
STROBE
DATA
CLOCK
TRIG /
GATE
/
BURST
LOGIC
U1,11
U1201
U1211
Q1102
01241
SQUARE
SELECTOR
U1211
Q1021
Q1022
Q1121
Q1122
LATCH
U1141
FAST SQ WV
TO U1012
Ø DAC
U1041
U1042A
U10420
Q1225
The data
from
latch U1141 is
applied to the
DAC
,
setting
the gain of the stage . The resulting output voltage is from
to 10
V.
This
voltage is
applied
through
R1152 to be
alge
braically summed with the +10 V reference . The sum is ap
plied
to
amplifier
U1042D
.
The output
voltage
from
U1042A
is also
applied
through
R1051 for algebraic summation with the +10 V reference
through R1052 . The sum is applied to amplifier U1042B , the
Lock
Phase Voltage
Generator .
V
UP
U1042B
CLAMP
ENABLE
SWITCH
CR1323
Q1223
Q1224
Ø
LOCK
PHASE
VOLTAGE
GENERATOR
KH
V
CR1324
KH
PHASE
CLAMP
DIODE
U1042C
Q1235
21
UP
Fig . 4-9 . Block diagram of Clamp Circuits .
Q1221
Q1222
Ø LOCK ERROR
LOOP
CAPACITOR
SCHFEAT
BURST ON
CLOXON
SELECTED
SQWV
SELECTED SQWV
3467-16
Clamp Phase Voltage Generator
The circuit consists of amplifiers U1042D and U1042C ,
transistors
Q1235 and
Q1225 , and
related circuitry . The cir
cuitry forms two operational amplifiers that take current
from and supply current to the node at the cathode of
CR1324 , the phase clamp diode . The sum voltage that is
applied to the input resistors of U1042D causes that amplifi
er
to
generate
a
voltage at the anode
of
CR1323 that is the
baseline clamp voltage . Amplifier U1042C and Q1235 form
another current
generator
,
driven by the
V₁
voltage
from
the Symmetry Circuits , that provides twice the loop capaci
tor current through Q1235 .
UP
U
U
U
U
U
U
U
U
L
U
U

Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English