Power control circuitry for a TDMA radio frequency transmitter

Details Power control circuitry for a TDMA radio frequency transmitter Power control circuitry for a TDMA radio frequency transmitter

1992-07-27

1993-03-09

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455116, 455126, 455127, 379 59, H03C 162

Patent

active

051932237

ABSTRACT:
A TDMA cellular telephone (600) includes in its transmit signal path, microphone (608), vocoder (612), data format circuitry (601), quadrature modulator (602), 90 MHz local oscillator (606), transmitter with mixer (604), transmitter filter (618), and antenna (620). In its receive signal path, the TDMA cellular telephone (600) includes receiver filter (622) coupled to antenna (620), quadrature demodulator (624), and data deformat circuitry (625). The channel frequency of TDMA cellular telephone (600) is loaded into synthesizer (616) by microcomputer (614) and applied to transmitter (604) and demodulator (624). TDMA cellular telephone (600) is controlled by microcomputer (614) which includes a memory with a control and signaling computer program stored therein. Transmitter (604) includes novel power control circuitry (100) comprised of variable gain stage (104), mixer (106), bandpass filter (109), and directional coupler (112) in a forward path, and detector (116), A/D converter (118 ), digital controller (120), and D/A converter (126) in a feedback path.

REFERENCES:
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4757502 (1988-07-01), Meuriche
patent: 4803440 (1989-02-01), Hotta et al.
patent: 4870698 (1989-09-01), Katsuyama
patent: 5086508 (1992-02-01), Furuno
patent: 5095542 (1992-03-01), Suematsu et al.

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