Transmitter power varying device having a bypass line for a powe

Details Transmitter power varying device having a bypass line for a powe Transmitter power varying device having a bypass line for a powe

1996-09-26

1999-06-01

Chin, Wellington

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455343, 330 51, H04B 104

Patent

active

059096438

ABSTRACT:
A transmitter section of a mobile telephone set of a cellular telephone system includes a high-frequency signal oscillator, a modulator, a variable gain amplifier, a power amplifier, an antenna duplexer, and an antenna. Two high-frequency signal changeover switches are respectively provided upstream and downstream of the power amplifier. In transmitting a signal at a low output power, the power amplifier is turned off and the two changeover switches cause a high-frequency signal to go through a bypass line, that is, bypass the power amplifier. Thus, transmitter power control with a wide dynamic range can be attained while the power consumption is greatly reduced.

REFERENCES:
patent: 5152004 (1992-09-01), Vaisanen et al.
patent: 5530923 (1996-06-01), Heinonen et al.
patent: 5661434 (1997-08-01), Brozovich et al.
patent: 5689819 (1997-11-01), Nishimura et al.

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