A21 Source Multiplier/Amplifier 50 (Soma 50) (E8363C And E8364C Only) - Agilent Technologies E8362C Service Manual

PNA Series Microwave Network Analyzers
E8362C, E8363C, E8364C
In bands 0–3, the 3.810 to 6.8 GHz output of the YTO and the 3.8 GHz output of the PMYO are mixed to
produce the 10 MHz to 3.0 GHz output frequency that is sent to the multiplier/amplifier 20 (MA 20). In bands
4–25, the 3 to 10 GHz output of the YTO is filtered and sent directly to the MA 20.
An additional signal is split off from the output signal and routed to the
Assembly (Option 080) where it is used to create the phase lock signal for the frequency offset mode of
operation (Option 080). Refer to
Multiplier/Amplifier 20 (MA 20)
The MA 20 filters, amplifies, and passes through, the 10 MHz to 10 GHz output frequencies in bands 0–10.
The signals for bands 11–25 are doubled, filtered, and amplified. Together, these two paths produce an
output frequency range of 10 MHz to 20 GHz.
For the E8362C analyzer, this signal is sent directly to the A22 switch splitter in the signal separation group.
For the E8363C and E8364C analyzers, this signal is sent to the A21 source multiplier/amplifier 50 (SOMA
50).
A portion of this output signal is split off and combined with other inputs in the ALC circuitry to control the
output power level.
ALC Circuitry
The following inputs are combined in the ALC circuitry to produce a signal that is sent to the MA20 to
control its output power level:
• output of the MA 20
• temperature compensation
• slope compensation
• power level DAC
• 1V/GHz signal from the A11 phase lock board

A21 Source Multiplier/Amplifier 50 (SOMA 50) (E8363C and E8364C Only)

The A21 SOMA 50 consists of three signal paths:
• In the first path, the 10 MHz to 20 GHz source signals for bands 0–15 are amplified, leveled, and passed
through to the A22 switch splitter.
• In the second path, the 10 to 20 GHz signals for bands 16–22 are doubled, filtered, and amplified to
produce the 20 to 40 GHz output.
• In the third path (E8364C only), a portion of the second-path signal is doubled to produce the 40 to
50 GHz output for bands 23–25.
The source ALC circuitry (located on the A16 test set motherboard) provides feedback to the SOMA 50 to
control the output power level.
Service Guide E8364-90038
Frequency Offset Group Operation (Options 080 and
Theory of Operation
Source Group Operation
A13 Frequency Offset Receiver
081).
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