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THEORY OF OPERATION
Front Panel Section
The front panel section of the signal generator provides the operator interface,
including the primary controls, connectors, and indicators. All front panel keys and
displays (except the power switch that directly controls the power supply) are
monitored and handled by the A13 Controller PCA, which is located in the output
module section.
Upper/Lower Module Sections
The two module sections are multi-compartmented, shielded enclosures that contain
the circuits that generate the instrument stimulus functions: frequency, modulation,
and amplitude. These enclosures provide the necessary circuit-to-circuit isolation to
prevent the generation of spurious signals. The enclosures serve to isolate the generator
circuits from the outside environment.
Rear Panel Section
The rear panel section includes the power supply, the cooling fan, various external
connectors, and the IEEE-488 Interface connector.
FUNCTIONAL DESCRIPTION
The key functional blocks of the signal generator (described in the following
paragraphs) are:
Frequency
The output frequency (Fo) is programmable with 1-Hz resolution from 0.01 MHz to
1056 MHz. The band controls are programmed in seven bands that are determined by
the output frequency (Fo). A coarse loop and sub-synthesizer frequency are
determined for each band.
The programming of the coarse loop steering digital-to-analog converter (DAC),
compensation DAC, and VCO control bits are determined from the coarse loop
frequency and the instrument-specific compensation data.
The programming of the sub-synthesizer compensation DAC is determined from the
sub-synthesizer frequency and the instrument-specific compensation data.
The programming of the sum loop steering and compensation DACs are derived from
the output frequency and the instrument-specific compensation data.
The 0.01- MHz to 1056-MHz frequency coverage is divided into the seven bands
shown in Table 2-1.
2-2
Frequency
Frequency modulation
Phase modulation
Level
Amplitude modulation
Pulse modulation
Internal modulation oscillator
Power supply
Software.
2-3.
2-4.
2-5.
2-6.
2-7.
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