Pulse or digital communications – Transceivers
Patent
1995-07-31
1997-08-12
Ghebretinsae, Temesghen
Pulse or digital communications
Transceivers
370280, 370294, 455 76, 455 86, H04B 138
Patent
active
056573448
ABSTRACT:
A transmitting/receiving signal processing circuit incorporates a frequency discrimination demodulator and a frequency synthesis local oscillator having a heterodyne phase locked loop for high speed switching. The transmitting/receiving signal processing circuit is used in a digital cordless communication device and has a transmitter for converting a signal input through a speaker and transmitting the converted signal as a radio wave via an antenna. A receiver converts a signal received by the antenna and then transmits the converted signal to a user in a time division communication system using a single frequency channel for transmission and reception according to constant time periods. A frequency synthesizer is also provided and includes a first phase lock loop for synthesizing a reference frequency for channel conversion; a switching stage providing a local oscillation signal from the receiver as a heterodyning source in a receiving mode, and providing a signal multiplied by the reference frequency as the heterodyning source in a transmission mode; and a second phase locked loop connected between the first phase locked loop and the receiver, for receiving the heterodyning source and generating transmitting/receiving frequencies in the transmission/receiving modes, respectively.
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Bushnell Esq. Robert E.
Ghebretinsae Temesghen
Samsung Electronics Co,. Ltd.
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