Demodulator stage for direct demodulation of a phase quadrature modulated signal and receiver including a demodulator stage of this kind
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United States of America Patent
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Jun 2, 1998
Grant Date -
N/A
app pub date -
Nov 12, 1996
filing date -
Nov 13, 1995
priority date (Note) -
Expired
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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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