Pulse or digital communications – Receivers – Angle modulation
Patent
1990-08-27
1995-08-29
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375328, 375334, 329300, 329303, H04L 2714, H03D 318
Patent
active
054467624
ABSTRACT:
An FSK radio receiver of direct conversion type, which derives baseband in-phase and phase quadrature signals from a received FSK RF signal in respective mixers by applying local oscillator signals to the mixers differing in phase by 90.degree., in which wide-band baseband 90.degree. phase shifting circuits formed of only digital logic elements phase shift the in-phase and phase quadrature signals to enable a demodulated digital data signal to be obtained by subsequent digital processing. In that processing, signals having a frequency that is double that of the in-phase and phase quadrature signals are derived and used to derive the demodulated data signal, ensuring high accuracy of detection and lowering the accuracy required for the local oscillator frequency.
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Hasegawa Makoto
Makimoto Mitsuo
Ohba Motoi
Bocure Tesfaldet
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
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