FM receiver including a phase-quadrature polyphase if filter

Details FM receiver including a phase-quadrature polyphase if filter FM receiver including a phase-quadrature polyphase if filter

1993-05-18

1998-02-03

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455307, 455324, 455340, H04B 126

Patent

active

057155291

ABSTRACT:
An FM receiver having an RF section, a first tunable mixer stage for the frequency conversion of a desired RF FM reception signal into a first intermediate frequency signal, an IF device and an FM demodulator. In order to enhance the integration of the apparatus, while maintaining a signal processing ability which is free from distortion, the FM receiver includes circuitry incorporated in the signal path for converting a single-phase signal into a pair of signals in mutual phase quadrature. The pair of phase-quadrature signals is applied to in-phase and quadrature signal paths of the IF device. The IF device having a polyphase IF filter incorporated in the in-phase and quadrature signal paths and has a bandpass characteristic which is symmetrical around its resonance frequency. The polyphase IF filter is coupled to the FM demodulator.

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