Demodulator and radio receiver having such a demodulator

Details Demodulator and radio receiver having such a demodulator Demodulator and radio receiver having such a demodulator

1990-11-15

1992-01-07

Pascal, Robert J.

Demodulators

Phase shift keying or quadrature amplitude demodulator

307557, H03D 300

Patent

active

050795139

ABSTRACT:
The invention relates to a demodulator and to a radio receiver having such a demodulator and, more particularly, to a demodulator for demodulating signals which were digitized by a direct detecting method in which a circuit scale is small and an electric power consumption is small. Particularly, it is a characteristic that a limiter in the demodulator comprises: a circuit for obtaining absolute values of the digital signals (I signal, Q signal) which are produced from an angle modulated wave and whose phases are mutually orthogonal; a circuit for outputting the sum (.vertline.I.vertline.+.vertline.Q.vertline.) of the absolute values or the larger one M(.vertline.I.vertline., .vertline.Q.vertline.) of the absolute values; a controller for producing a control signal according to an output of the above circuit; and scalers which change the amplitudes of the first and second digital signals in accordance with the control signal and which are constructed by a plurality of shift registers and adders.

REFERENCES:
patent: 4833416 (1989-05-01), Attwood

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