RF and IF Circuitry of an uplink receiver
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsRobert C. Gipe, William E. Engelkemier
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Abstract
The present invention relates to uplink receiver circuitry which combines a local oscillator signal with an S-Band signal in a high-level mixer, operating in saturation, to produce an intermediate frequency (IF) signal in a high-level mixer. The use of a saturated high-level mixer enables the circuitry to convert received RF signals into undistorted IF signals without an RF limiter and its attendant dynamic range restrictions and distortion.
Claims7
Apparatus for converting an FM mark-and-space RF signal in the S-band to an intermediate frequency mark-and-space signal comprising:
- means for attenuating the RF S-Band signal,
- a local oscillator producing a signal at a fixed level, and
- a high-level mixer means, having linear and saturation modes, for mixing the attenuated S-Band signal with the signal produced by the local oscillator and for limiting while the mixer means is in the saturation mode.
Dependencies are inferred from the claim text.