Radiocommunication system operating in a time shared control

Details Radiocommunication system operating in a time shared control Radiocommunication system operating in a time shared control

1995-11-22

1998-07-28

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

327 63, H04B 144

Patent

active

057873399

ABSTRACT:
A radiocommunication system comprises an input/output stage section of the system, which includes a first and a second differential circuits each having a differential transistor pair and a current source for supplying operational current to each of the differential transistor pairs. The input pair of the first differential circuit is connected to the output pair of a transmitting section of the system to supply an output transmission signal through an antenna. The input of the second differential circuit is connected to the antenna and the output pair thereof are connected to the input pair of a receiving section of the system. Each of the current sources is implemented by a current mirror including a first transistor activated and inactivated by a changeover signal in a time shared control and a second transistor for supplying the operational current to a corresponding one of the differential transistor pairs. The changeover operation effected by the current sources provides advantages of a low insertion loss and a large signal-to-noise ratio.

REFERENCES:
patent: 4572979 (1986-02-01), Haar et al.
patent: 4673830 (1987-06-01), Giorgetta et al.
patent: 5045804 (1991-09-01), Sugawara et al.
patent: 5444864 (1995-08-01), Smith
patent: 5590411 (1996-12-01), Sroka et al.
P. O'Sullivan et al., "High Performance Integrated PA, T/R Switch for 1.9 GHz Personal Communications Handsets", IEEE GaAs IC Symposium 93, pp. 33-35 (1993).

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