Power control circuit for a radio frequency transmitter

Details Power control circuit for a radio frequency transmitter Power control circuit for a radio frequency transmitter

1996-09-13

1999-01-19

Chin, Wellington

Telecommunications

Transmitter

Carrier amplitude control

455115, 455126, 330279, 330284, 370335, 370342, H04B 104

Patent

active

058624600

ABSTRACT:
A gain controller (130) for a radio frequency (RF) transmitter (102) controls a power level of a signal (123) transmitted within a predetermined range of output power levels. The gain controller (130) provides the first gain control signal (131) and the second gain control signal (133) responsive to an output power level control signal (150). The first gain control signal (131) controls a gain of a first variable gain stage (144) to vary the power level of the transmit signal (115) at an intermediate frequency causing the output power level of the transmit signal (123) to vary over a lower range of the predetermined range of output power levels. The second gain control signal (133) controls a gain of the second variable gain stage (120) to vary the power level of the transmit signal (121) at a radio frequency causing the output power level of the transmit signal (123) to vary over an upper range of the predetermined range of output power levels. The power control circuit (130) is advantageously utilized in a code division multiple access (CDMA) radiotelephone (100) to provide power control over an 85 dB range of power levels while minimizing sideband noise emissions, current drain, and complexity of the RF transmitter (102).

REFERENCES:
patent: 4553105 (1985-11-01), Sasaki
patent: 5193223 (1993-03-01), Walczak et al.
patent: 5287555 (1994-02-01), Wilson et al.
patent: 5307512 (1994-04-01), Mitzlaff
patent: 5313658 (1994-05-01), Nakamura

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