Quadrature receiver

Details Quadrature receiver Quadrature receiver

1989-05-03

1990-09-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

455324, 329358, 329363, H03D 122

Patent

active

049550390

ABSTRACT:
A quadrature receiver is disclosed which contains two mixers (M1, M3) in an in-phase receiving path and two mixers (M2, M4) in a quadrature receiving path for converting a received signal to a low IF. Each of the mixers is fed with an oscillator signal (O1 through O4), with the oscillator signal fed to one mixer of the respective receiving path having alternately the same or opposite phase from that of the oscillator signal fed to the other mixer of the same receiving path. In each receiving path, the mixers are followed by a circuit (P', P") which delivers an in-phase signal and a quadrature signal, respectively. These circuits compensate for the DC offset caused by the mixers.

REFERENCES:
patent: 4397039 (1983-08-01), McAuliffe
patent: 4476585 (1984-10-01), Reed
patent: 4736390 (1988-04-01), Ward et al.
patent: 4852123 (1989-07-01), Bickley et al.
R. A. Brown et al, Some Features of Signal Demodulation Resulting from the Practical Implementation of a Direct Conversion Radio Receiver, "Phillips Journal of Research," vol. 41, No. 3, 1986, pp. 219-231.
F. E. Churchill et al, The Correction of I and Q Errors in a Coherent Processor-"IEEE Transactions on Aerospace and Electronic Systems", vol. AES-17, No. 1, Jan. 1981; pp. 131-138.
Donald K. Weaver, Jr.-A Third Method of Generation and Detection of Single-Sideband Signals, "Proceedings of the IRE", Dec. 1956, pp. 1703-1705.

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