Radio transmitter

Details Radio transmitter Radio transmitter

1996-06-21

1998-10-20

Chin, Tommy P.

Telecommunications

Transmitter

With feedback of modulated output signal

455115, 455116, 330279, 330284, 330129, H03G 330, H03G 320

Patent

active

058261770

ABSTRACT:
A variable gain amplifier of a transmitter is controlled to obtain optimum transmission power by using a directional coupler and a detector to detect the transmission signal level that is then subtracted from a reference signal corresponding to a desired transmission signal power. The subtracted output is used to control the variable gain amplifier. The reference signal is generated by a control circuit and a digital-to-analog convertor that produce an attenuated basic reference signal. The attenuated basic reference signal is further adjusted in signal level by a voltage divider network that is controlled by a number of control signals produced by the control circuit.

REFERENCES:
patent: 5099204 (1992-03-01), Wheatley, III
patent: 5126686 (1992-06-01), Tam
patent: 5175875 (1992-12-01), Yokoya et al.
patent: 5321721 (1994-06-01), Yamaura et al.
patent: 5337006 (1994-08-01), Miyazaki
patent: 5408197 (1995-04-01), Miyake
patent: 5504776 (1996-04-01), Yamaura et al.
patent: 5606285 (1997-02-01), Wang et al.
patent: 5646578 (1997-07-01), Loh et al.

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