16 Keysight Agile Signal Generator Service Guide
Troubleshooting
Highband and Midband Path - Frequencies Greater than 3.0 GHz
The output of the DAC board 0.65 to 1.5 GHz is routed to the A14,
Lowband/Highband Switch. Then, via the A14 High band path the signal is
routed to A16 Frequency Multiplier. Depending on the desired output
frequency, the signal is routed to proper doublers, 1st doubler, 2nd doubler,
3rd doubler and/or 4th doublers within the frequency multiplier.
The A16 Frequency Multiplier output is routed to the A17 Agile Modulation
Filter. The A17 contains pulse modulator, amplifiers and filters. For Midband
(> 3 to ≤ 6 GHz), the output is routed from A16J4 to A17J1. For Highband
(> 6 to ≤ 20.0 GHz), the output is routed from A16J10 to A17J3.
In 40 GHz models, the A17 Agile Modulation Filter is routed to the doubler path
of the A19 40 GHz Doubler (from A17J4 to A19 doubler input) for frequency
above 20 GHz. For frequency ≤ 20 GHz, the A19 40 GHz Doubler is bypassed.
The output of the A19 40 GHz Doubler is connected to the A20 Output Leveling
Module which contains a coupler, high band detector then out to the front or
rear panel RF output connector.
For Option AT1/AT2, the A20 Output Leveling Module includes a coupler, high
band detector, a mechanical switch, an electronic attenuator and a mechanical
attenuator, then out to the front or rear panel RF output connector.
Lowband Path - Frequencies 3.0 GHz and Below
For frequencies 3.0 GHz and below, the DAC board output is between 0.01 and
1.5 GHz.
There are two paths within the lowband. For frequencies between 0.01 and
1.43 GHz, the DAC output routes to the lowband path of the A14 switch to the
A18J2 Lowband Output Module. For frequencies ≥ 1.43 and ≤ 3.0 GHz, the
DAC output routes to Highband path of A14 switch to the A16J2 Frequency
Multiplier. A first doubler is used to produce the output frequencies which
route to A16J4 and out to the input of A17J1, then out to A17J2 and input to
A18J1, Lowband Output Module.
The 10 MHz to 3.0 GHz signal is routed to the low band output module, A18.
The signal then goes through low band pulse modulator, amplifiers, filters and
Coupler/Detector then switched into the highband path by a switch in the A17
Agile Modulation Filter microcircuit. From this point, the low frequency signals
flow to the front/rear (1EM) through the highband path.
To Next Page
Loading...
Need help?
General
