Closed loop power controller

Details Closed loop power controller Closed loop power controller

1993-01-22

1994-10-04

Mottola, Steven

Amplifiers

Modulator-demodulator-type amplifier

330107, H03F 338, H03F 136

Patent

active

053529863

ABSTRACT:
A power controller includes a closed-loop system having a summer to sum an input signal with a derived output signal to produce a difference signal. A comparator compares the difference signal with a reference signal to produce a digital signal representative of the polarity difference between the difference signal and the reference signal. Two switching networks respond to the digital signal to produce high energy outputs representative of the digital signal which are used to reduce the level of the difference signal in a frequency band of interest at the comparator. A low pass filter between the high energy outputs and the comparator attenuates high-frequency noise. A low-pass filter of at least the third order, connected in the closed loop, enhances the signal-to-noise ratio. In a specific application the power controller is a power amplifier and the input signal is in the audio frequency range.

REFERENCES:
patent: 4724396 (1988-02-01), Taylor et al.
patent: 5218315 (1993-06-01), Turner

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