HP 8340b User Manual

Figure
D-3.
A46
7.0
GHz
Low
Pass
Filter
Assembly
Drawing
A47
Sense
Resistor Assembly
Theory
of
Operation
The
A47
sense
resistor
assembly
contains
the
high
power
portions
of
both
the
ASS
YO
driver
and
the
A28 SYTM
driver.
The
A28
assembly
is
discussed in
the
RF
Section.
Many
components on
the
A47
sense
resistor
assembly
are
part
of
the
A55
YO
driver
voltage-to-
current
converter.
These
components are
mounted
on
the
A47
assembly
(which
is
a
heat
sink)
for
proper
heat
dissipation.
A48
YO
Loop
Sampler
Theory
of
Operation
The
A48
YO
Loop Sampler
mixes
the
output
of
the A44
YIG
oscillator (via
the A45
directional
coupler,
AT2
15
dB
attenuator
and
A46
7
GHZ
low
pass
filter)
with
the
Nth
harmonic
of
the
output
of
the
M/N
Loop.
The
sampler
IF
output
is
a
20
to
30
MHz
difference
signal
that
is
output
to
the
A49 YO
loop
phase
detector.
A49
YO
Loop
Phase
Detector Theory
of
Operation
Sampler
IF
signal (from
the
A48
YO loop
sampler) and
the
20-30
MHz
signal
(from
the
A36
PLL1 VCO)
are
inputs
to
the
A49
YO
loop
phase detector
assembly.
These
signals
are
phase-compared
and
the
result
is
integrated to
produce
the
following
signals:
•
YOTUNE
•
FM
Coil
Drive
•
High
Unlock
YO
(HULY)
HP 8340B/41B
Sweep
Generator
-
YO
Loop Theory
of
Operation
D-ll

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English