Method and apparatus for controlling signal amplitude level

Details Method and apparatus for controlling signal amplitude level Method and apparatus for controlling signal amplitude level

1997-09-05

1999-05-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330279, H03G 330

Patent

active

059072610

ABSTRACT:
An amplitude leveling circuit includes a variable gain, linear amplifier which receives an input signal and generates an output signal corresponding to the input signal. The signals may be in differential format. A signal processor receives the output signal and determines a corresponding mean squared signal. The signal processor includes a multiplier which squares the output signal, and an averager that averages the squared signal to generate the mean squared signal. An analyzer compares the mean squared signal with a reference and generates a feedback control signal that controls the gain of the variable gain amplifier in accordance with the difference between the mean squared signal and the reference value. The gain of the variable gain amplifier is controlled so that the amplitude of the output signal is maintained at a desired amplitude level without distorting the originally input waveform shape.

REFERENCES:
patent: 3944945 (1976-03-01), Corte et al.
patent: 4250471 (1981-02-01), Duncan
patent: 4322811 (1982-03-01), Voorman
patent: 4667163 (1987-05-01), Gay
patent: 5546050 (1996-08-01), Bonebright et al.
patent: 5642075 (1997-06-01), Bell
International Symposium on Circuits and Systems (ISCAS), Linear Circuits and Systems (LCD), Analog Signal Processing (ASP), London, May 30-Jun. 2, 1994, vol. 5, May 30, 1994, pp. 661-664, XP000592923, Institute of Electrical and Electronics Engineers, K. Halonen et al., "Integrated Bicmos IF-Modules for Mobile Telecommunications Applications".

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