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

H - Electricity

04

B

H04B 1/04 (2006.01) H03G 3/20 (2006.01) H04B 1/40 (2006.01) H04B 7/005 (2006.01) H04B 7/26 (2006.01) H04J 3/02 (2006.01) H04B 1/56 (2006.01)

Patent

CA 2072582

A TDMA cellular telephone (600) includes, in its transmit signal path, microphone (608), vocoder (612), data format circui- try (601), quadrature modulator (602), 90 MHz local oscillator (606), transmitter with mixer (604), transmitter filter (618), and an- tenna (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.

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