Method and apparatus for providing the in-phase and quadrature c

Details Method and apparatus for providing the in-phase and quadrature c Method and apparatus for providing the in-phase and quadrature c

1980-03-26

1982-08-10

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329167, 455214, 455337, H03D 318

Patent

active

043440401

ABSTRACT:
The method and apparatus provides the in-phase I and quadrature Q components of a bandpass signal x(t) of center frequency f.sub.c and bandwidth 2w. The signal x(t) is heterodyned to have an intermediate center frequency f.sub.o where w.ltoreq.f.sub.o .ltoreq.f.sub.c. This signal is divided into two signals and each is sampled during successive periods T.sub.s where T.sub.s =m/f.sub.o and m is an integer. However, the instant of sampling of one signal is shifted with respect to the other by b/4f.sub.o where b is an odd integer. In the various implementations, the shift may be either positive, negative, or both, to provide the quadrature component Q, whereas the sampling of the other signal provides the in-phase component I.

REFERENCES:
patent: 3925732 (1975-12-01), Tanaka et al.
patent: 4224575 (1980-09-01), Mosley et al.
patent: 4253067 (1981-02-01), Caples et al.

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