Wavetek 3000 - M10 W-6 - Output Amplifier; Amplifier Stage; Leveler Circuit

THEORY OF OPERATION
IX-ROM //134
Fl~OM M3~ -
I
AlN .,-/ OC-
7%1411N,~
rROM
C311o BOA Ro
4NALO4
r!/WIWG
`ROlAM172
WIDE
OSCILLATOR I
NAfTR0W
OSCIG
L A TOR
Figure 3-12 . M9W
The
mainfunction of the M10W module is
to
amplify the RF signal from the
M9W
to a level
programmable between -7 and
+13 dBm . A leveler
circuit maintainsa
constant
amplitude outputsignal over
the widefrequency
range . The Unleveled
light driver causes the
front panel
light to glowwhen the leveler
circuit
exceeds its proper
operating range .
L
£ 1/E[ ERS
ll-99 -/718
1011z
1199 MHz
t Er~'t F~
3 .8
M10W-6 - OUTPUTAMPLIFIER

3 .8 .2
Sweep Oscillator
Leveler
ro 1'r3q
ro .0/o w
/-"a -'tRX
rO /133
The leveler
uses a peak detector,
dif-
ferentialamplifier and a PIN
diode
attenuator
.

The peak detector is
fed
from the RF output .

The resulting level
is compared to
a DC (or AM) referenceby
the differential
amp which supplies the
controlcurrent to the
PIN diodeatten-
uator .

If the detector
RF output de-
viates from the
reference level, the
See
Figure
3-13
.
3.8
.1 Amplifier
signal
to the PINdiode causes the
to be
decreased or increased .
In
addition to providing a flat
input
frequency
This section is
a four-transistorwide response, the leveler
allows for elec-
band
amplifier which can increase the tronic control
of the RF outputampli-
RF by about 23 dB
. tude by varying the DC
reference . The
reference comes from the meter
board
(C315)
.