PDM Amplifier having distortion reduction circuit

Details PDM Amplifier having distortion reduction circuit PDM Amplifier having distortion reduction circuit

1983-09-28

1985-04-09

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330149, H03F 338

Patent

active

045104565

ABSTRACT:
A pulse duration modulator (PDM) provides a train of pulses at a fixed repetition rate and a fixed amplitude but of a pulse width dependent upon an input signal. A switching transistor receives this pulse and is turned on for a duration dependent on the pulse width. The output circuit of the transistor is connected to a load for receiving an amplified version of the pulse train. Stray capacitance across the output circuit causes distortion in the amplified pulse particularly when the switch on time is less than the off time. A distortion reduction circuit is connected to the output circuit for inserting or increasing the current flowing to the output circuit to more rapidly charge the stray capacitance and thereby reduce distortion.

REFERENCES:
patent: 4004246 (1977-01-01), Hamada
patent: 4122415 (1978-10-01), Luther, Jr. et al.
patent: 4140980 (1979-02-01), Cummings
patent: 4164714 (1979-08-01), Swanson

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