Amplifiers – Modulator-demodulator-type amplifier
Patent
1992-06-10
1993-06-01
Mottola, Steven
Amplifiers
Modulator-demodulator-type amplifier
330149, H03F 338
Patent
active
052163768
ABSTRACT:
An amplifier system is disclosed having distortion reduction. The system includes a pulse duration modulator having an input circuit for receiving an input signal, such as an audio signal, for providing a train of pulses exhibiting a fixed repetition rate and a fixed amplitude and having varying widths dependent upon the magnitude of the input signal. A switch is provided having an input circuit for receiving the PDM pulses and responds thereto so as to be on for a duration dependent upon the pulse width. The switch has an output circuit connected in series with a load across a DC voltage source to provide an amplified output signal to the load. A signal detector is connected to the output circuit to provide a correction signal having a value that various proportional to that of the amplified output signal. The input signal is divided by the correction signal prior to application to the input circuit of the pulse duration modulator.
REFERENCES:
patent: 4554512 (1985-11-01), Aiello
Harris Corporation
Mottola Steven
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