Transmitter and receiver circuit and method therefor

Details Transmitter and receiver circuit and method therefor Transmitter and receiver circuit and method therefor

1993-04-30

1995-02-14

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 75, 455 85, H04B 144

Patent

active

053903633

ABSTRACT:
A circuit for alternately providing a first frequency to a receiver stage (20) and a second frequency to a transmitter stage (25) of a transmitter and receive circuit (11). The circuit comprises an oscillator (38), a first switch (33), a second switch (42), and a control circuit (29). The first switch (33) couples information to the oscillator (38) to be transposed on the second frequency during transmission. The second switch (42) couples the oscillator (38) to either the transmitter stage (25) or the receiver stage (20). Prior to changing oscillator frequency the control circuit (29) disables both outputs of the second switch (42). The control circuit (29) alternately tunes the oscillator (38) to the first frequency and enables the second switch (42) such that the oscillator (38) is coupled to the receiver stage (20) and tunes the oscillator (38) to the second frequency, enables the first switch (33), and enables the second switch (42 ) such that the oscillator (38) is coupled to the transmitter stage (25).

REFERENCES:
patent: 4246539 (1981-01-01), Haruki et al.
patent: 4476575 (1984-10-01), Franke et al.
patent: 5276913 (1994-01-01), Lee et al.

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