Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1996-11-12
1998-06-02
Mis, David
Demodulators
Phase shift keying or quadrature amplitude demodulator
329306, 375329, 455293, 455323, 455333, H03D 300, H04L 27227
Patent
active
057606455
ABSTRACT:
A demodulator stage for direct demodulation of a phase quadrature modulated signal provides two baseband signals and comprises a matched 900.degree. coupler to which the modulated signal is fed and supplying two phase quadrature modulated signals. Two low-noise amplifiers with identical specifications each receive one of the phase quadrature modulated signals and supply an amplified signal. Two mixers each receive one of the amplified signals and a common local oscillator signal and supply the baseband signals. The 90.degree. coupler, the low-noise amplifiers and the two mixers can be integrated into the same MMIC. One application is to a receiver for frequency evasive phase quadrature modulated signals.
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"New Zero IF Chipset from Philips", Electronic Engineering, vol. 67, No. 825, Sep., 1995, London, GB, p. 10.
Comte Michel
LeClerc Gerard
Alcatel Telspace
Mis David
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