Power control circuitry for achieving wide dynamic range in a tr

Details Power control circuitry for achieving wide dynamic range in a tr Power control circuitry for achieving wide dynamic range in a tr

1991-06-03

1994-04-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455127, 330144, 330284, H04B 104

Patent

active

053075129

ABSTRACT:
Power control circuitry (100) uses two attenuators in the transmit path to achieve wide dynamic range. An intermediate frequency (IF) attenuator (200) is placed before a mixer (212) in the IF section of the transmit path and a radio frequency (RF) attenuator (221) is placed after the mixer (212) in the RF section of the transmit path. Power control circuitry (236) controls setting of the two attenuators in response to a magnitude control signal (102) related to a RF output signal at a desired power level. To conserve battery power of the subscriber unit, only the RF attenuator (221) is adjusted when the desired power level is to be within a given range below the maximum transmission level. For ranges below the given range, the RF attenuator (221) is set for maximum attenuation and the IF attenuator (200) is adjusted.

REFERENCES:
patent: 3828270 (1974-08-01), Ebisch
patent: 4004224 (1977-01-01), Arens et al.
patent: 4317083 (1982-02-01), Boyd
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4630117 (1986-12-01), Parker
patent: 4709404 (1987-11-01), Tamura et al.
patent: 4803440 (1989-02-01), Hotta et al.
Hewlett/Packard, "8656A Signal Generator 0.1-990 MHz", Operating and Service Manual, Part No. 08656-90107, printed May 1981, for Hewlett/packard, 1501 Page Mill Rd., Palo Alto, Calif.
R. L. Drake Company, "Model 2-B Receiver"-described on pp. 16 and 18.

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