Transceiver having a divide-down transmit offset scheme

Details Transceiver having a divide-down transmit offset scheme Transceiver having a divide-down transmit offset scheme

1991-11-04

1994-01-04

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 76, H04B 140

Patent

active

052769151

ABSTRACT:
A radio communication device, having a receive mode and a transmit mode, includes a receiver portion, a transmitter portion, and multiple oscillators for providing reference waveforms for the radio communication device. During the receive mode, the receiver portion receives signals having a selected frequency, converts received signals to at least a first intermediate frequency (IF), and a transmitter oscillator produces a first waveform having a frequency equal to a multiple of the first intermediate frequency during the receive mode. During the transmit mode, the transmitter portion requires a reference waveform having an offset frequency equivalent to the first IF frequency to produce a radio frequency signal. Thus, the radio communication device also comprises a divider coupled to the transmitter oscillator for dividing the frequency of the first waveform to the required offset frequency in the transmit mode.

REFERENCES:
patent: 3324396 (1967-06-01), Schneider
patent: 4512035 (1985-04-01), Victor et al.
patent: 4551856 (1985-11-01), Victor et al.
patent: 4688261 (1987-08-01), Killoway et al.
patent: 4879758 (1989-11-01), DeLuca et al.
patent: 4903257 (1990-02-01), Takeda et al.
patent: 4926441 (1990-05-01), Iwasaki
patent: 5123008 (1992-06-01), Beesley

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