A10 Frequency Reference Board - Keysight N5264A Service Manual

Theory of Operation
Synthesized LO Group Operation (Option 108)
Band
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

A10 Frequency Reference Board

This assembly provides stable reference frequencies to the rest of the
instrument. A high stability 10 MHz oven-controlled crystal oscillator (OCXO)
normally provides the frequency standard. However, if a 10 MHz external
reference signal is detected at the 10 MHz EXT REF IN port on the rear panel, it
is used as the frequency reference instead.
The 10 MHz reference signal is used to phase lock a 100 MHz VCO. The output
of this VCO is then divided by ten to produce the 10 MHz EXT REF OUT rear
panel signal and also a 10 MHz reference signal for the A12 signal processing
ADC module (SPAM) board. The VCO output is also divided by two to produce
a 50 MHz reference signal for the A11 13.5 GHz LO synthesizer board.
5-6
LO
Harmoni
c 
A11
Number
Synthesizer 
(N)
Frequency (GHz)
- -
- -
1 0.01761 to 0.50751
1 0.50761 to 1.00761
1 1.00761 to 2.00761
1 2.00761 to 3.00761
1 3.00761 to 4.00761
1 4.00761 to 5.33961
1 5.33961 to 6.75961
1 6.75961 to 8.00761
1 8.00761 to 10.67161
1 10.67161 to 13.51761
1 6.758803 to 7.703803
1 7.703803 to 8.003803
1 8.003803 to 10.00381
1 10.00381 to 10.66781
1 10.66781 to 13.25381
A21
HMA26.5
Frequency (GHz)
-
-
0.01761 to 0.50751
0.50761 to 1.00761
1.00761 to 2.00761
2.00761 to 3.00761
3.00761 to 4.00761
4.00761 to 5.33961
5.33961 to 6.75961
6.75961 to 8.00761
8.00761 to 10.67161
10.67161 to 13.51761
13.51761 to 15.40761
15.40761 to 16.00761
16.00761 to 20.00761
20.00761 to 21.33561
21.33561 to 26.50761
Keysight N5264A Service Guide