Dual quadrature frequency converter

Details Dual quadrature frequency converter Dual quadrature frequency converter

1990-01-31

1991-04-09

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Including microwave or distributed parameter structure

329358, 329362, 332152, 332164, 332178, 455325, 455333, H03D 118

Patent

active

050068113

ABSTRACT:
A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal are each phase shifted -90 degrees by the couplers. The RF and LO signals are mixed as are the phase-shifted RF and LO signals. Each mixed signal is low-pass filtered and the filtered signals are added thereby producing an intermediate frequency signal.

REFERENCES:
patent: 3761829 (1973-09-01), Spaulding
patent: 4509208 (1985-04-01), Sogo et al.
patent: 4603436 (1986-07-01), Butler
patent: 4804931 (1989-02-01), Hulick
"A GaAs MESFET Mixer with Very Low Intermodulation", IEEE Trans., Microwave Theory Tech., vol. MTT-35, No. 4, Apr. 1987, pp. 425-429, by S. A. Maas.
"2 to 8 GHz Double Balance MESFET Mixer with +30 dBm Input 3rd Order Intercept", IEEE MIT-S Int. Microwave Symposium Digest, vol. 11, 1988, pp. 1097-1100, by S. Weiner, D. Neuf & S. Spohrer.

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