Service Guide 12-19
8719ET/20ET/22ET Theory of Operation
8719ES/20ES/22ES Signal Separation: ES Models Only
RF Network Analyzers
Signal Separation: ES Models Only
Figure 12-5 Signal Separation Simplified Block Diagram
A58 M/A/D/S Modulator, Amplifier, Detector, Splitter
The M/A/D/S microcircuit accomplishes four separate functions:
• The modulator controls the output power proportionally to the signal produced by the
ALC circuit on the source interface board.
• The amplifier provides up to +30 dB of amplification. For maximum PORT 1 and PORT
2 output power levels, refer to Table 12-1 on page 12-4.
• The detector outputs a voltage that is proportional to the RF power out of the amplifier.
This voltage is used by the ALC circuit on the source interface board.
• The power source divides the source signal into two parts. One signal is routed directly
to the A64 R sampler and the other is sent through the A69 step attenuator, A74
transfer switch, A60/A61 bias tees, A62/A63 directional couplers and to the test ports
(PORT 1 /PORT 2).
The M/A/D/S microcircuit is controlled by the ALC circuitry on the source interface board.
The CPU provides fine control of the test port power for applications such as power sweep.
To Next Page
Loading...
Need help?
General
