Quadrature-free RF receiver for directly receiving angle modulat

Details Quadrature-free RF receiver for directly receiving angle modulat Quadrature-free RF receiver for directly receiving angle modulat

1998-02-23

2000-08-29

Bost, Dwayne D.

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

4552361, 329345, H04B 116, H04B 106, H03D 300

Patent

active

061120715

ABSTRACT:
The present invention, generally speaking, provides a quadrature-free RF receiver for directly receiving RF signals such as angle modulated signals. Various embodiments of the receiver use a digital phase detector together with well-known RF components: a limiter, an envelope detector, a slow Automatic Gain Control (AGC) circuit, a fast AGC circuit, etc. Demodulation may be non-coherent or coherent. The approach followed is to handle the underlying non-linearities of the demodulation process within the circuitry itself, rather than relegating the non-linearities to a separate signal processing step as in the prior art. No I and Q signals are obtained, and no coordinate conversions are performed, offering the potential for space savings, increased accuracy, and especially power savings. Depending on the nature of the modulation employed, either circuitry relating to amplitude recovery or circuitry relating to phase recovery may be dispensed with. By comparison, in quadrature systems, at least the mixing step must remain the same regardless of the characteristics of the modulation employed.

REFERENCES:
patent: 4164623 (1979-08-01), Hilbert et al.
patent: 4653117 (1987-03-01), Heck
patent: 5289505 (1994-02-01), LaRosa et al.
patent: 5461643 (1995-10-01), LaRosa et al.
patent: 5493713 (1996-02-01), Horsfall et al.

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