Wide band zero if quadrature demodulator using a intermediate fr

Details Wide band zero if quadrature demodulator using a intermediate fr Wide band zero if quadrature demodulator using a intermediate fr

1995-05-31

1998-06-02

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455324, 455337, 455304, 375332, 329306, H04B 126

Patent

active

057616159

ABSTRACT:
A low power zero-IF selective call receiver has a local oscillator (106) that generates an injection signal for a first mixer (104) and a pair of quadrature phase related injection signals (122, 124) for a pair of second mixers (112, 114). The first mixer converts the received carrier signal (102) to an intermediate signal (108). A digital phase shifter/divider (116) coupled to the local oscillator (106) generates the pair of quadrature phase related injection signals (122, 124) at the frequency of the intermediate signal (108) which also equals the frequency of the local oscillator (106) divided by an integer greater then 1. The pair of second mixers (112, 114) coupled to the digital phase shifter/divider (116) converts the in and quadrature phase components (122, 124) of the intermediate signal (108) to respective in and quadrature phase baseband signals (126, 128).

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ICs simplify design of single-sideband receivers; Robert J. Zavrel, Signetics Corp. EDN Apr. 3, 1986.

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