5-8 Service Guide E8364-90038
Theory of Operation PNA Series Microwave Network Analyzers
Source Group Operation E8362C, E8363C, E8364C
A8 Fractional-N Synthesizer Board
The A8 fractional-N synthesizer board uses the 5 MHz reference signal from the A10 frequency reference
board to tune two VCO circuits: one that sweeps from 1500 to 3010 MHz and one that is set to a CW
frequency of 2250 MHz. In bands 0–1, these two signals are heterodyned to produce the output frequencies
listed in Ta b l e 5 -2 . In band 2, the output of the swept VCO is passed through a divide-by-2 circuit to produce
the output frequencies listed in Ta b l e 5 - 2 . In all other bands, the swept VCO signal is sent directly to the
synthesizer output.
Table 5-2 Subsweep Frequencies
Model
Band
L.O. Harmonic
Number (N)
A8 Frac-N
Synthesizer
Frequency
(GHz)
A17
LOMA 10
Frequency
(GHz)
A20 LODA (L.O.)
Frequency
(GHz)
A12
Source 20
Frequency (GHz)
A21
SOMA 50
Frequency (GHz)
(E8363/4C Only)
E8362C, E8363C, E8364C
0 1 0.011 to 0.046 0.011 to 0.046 0.011 to 0.046 0.010 to 0.045 0.010 to 0.045
1 1 0.053 to 0.756 0.053 to 0.756 0.053 to 0.756 0.045 to 0.748 0.045 to 0.748
2 1 0.756 to 1.508 0.756 to 1.508 0.756 to 1.508 0.748 to 1.500 0.748 to 1.500
3 1 1.50 to 3.00 1.50 to 3.00 1.50 to 3.00 1.50 to 3.00 1.50 to 3.00
4 1 1.50 to 1.90 3.00 to 3.80 3.00 to 3.80 3.00 to 3.80 3.00 to 3.80
5 1 1.90 to 2.25 3.80 to 4.50 3.80 to 4.50 3.80 to 4.50 3.80 to 4.50
6 1 2.25 to 2.40 4.50 to 4.80 4.50 to 4.80 4.50 to 4.80 4.50 to 4.80
7 1 2.40 to 3.00 4.80 to 6.00 4.80 to 6.00 4.80 to 6.00 4.80 to 6.00
8 1 1.50 to 1.60 6.00 to 6.40 6.00 to 6.40 6.00 to 6.40 6.00 to 6.40
9 1 1.60 to 1.90 6.40 to 7.60 6.40 to 7.60 6.40 to 7.60 6.40 to 7.60
10 1 1.90 to 2.50 7.60 to 10.00 7.60 to 10.00 7.60 to 10.00 7.60 to 10.00
11 1 2.50 to 3.00 5.00 to 6.00 10.00 to 12.00 10.00 to 12.00 10.00 to 12.00
12 1 1.50 to 1.60 6.00 to 6.40 12.00 to 12.80 12.00 to 12.80 12.00 to 12.80
13 1 1.60 to 1.90 6.40 to 7.60 12.80 to 15.20 12.80 to 15.20 12.80 to 15.20
14 1 1.90 to 2.00 7.60 to 8.00 15.20 to 16.00 15.20 to 16.00 15.20 to 16.00
15 1 2.00 to 2.50 8.00 to 10.00 16.00 to 20.00 16.00 to 20.00 16.00 to 20.00
E8363C, E8364C
16 3 1.67 to 1.90 6.67 to 7.60 6.67 to 7.60 10.00 to 11.40 20.00 to 22.80
17 3 1.90 to 2.13 7.60 to 8.53 7.60 to 8.53 11.40 to 12.80 22.80 to 25.60
18 3 2.13 to 2.50 8.53 to 10.00 8.53 to 10.00 12.80 to 15.00 25.60 to 30.00
19 3 2.50 to 2.67 5.00 to 5.33 10.00 to 10.67 15.00 to 16.00 30.00 to 32.00
20 3 2.67 to 3.00 5.33 to 6.00 10.67 to 12.00 16.00 to 18.00 32.00 to 36.00
21 3 1.50 to 1.60 6.00 to 6.40 12.00 to 12.80 18.00 to 19.20 36.00 to 38.40
22 3 1.60 to 1.67 6.40 to 6.67 12.80 to 13.33 19.20 to 20.00 38.40 to 40.00
E8364C
23 3 1.67 to 1.90 6.67 to 7.60 13.33 to 15.20 10.00 to 11.40 40.00 to 45.60
24 3 1.90 to 2.00 7.60 to 8.00 15.20 to 16.00 11.40 to 12.00 45.60 to 48.00
25 3 2.00 to 2.08 8.00 to 8.33 16.00 to 16.67 12.00 to 12.50 48.00 to 50.00
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