Demodulators – Amplitude modulation demodulator – Including microwave or distributed parameter structure
Patent
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.
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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.
Grimm Siegfried H.
McCollom Alan T.
Triquint Semiconductor, Inc.
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