Amplifiers – Modulator-demodulator-type amplifier
Patent
1975-06-03
1977-01-18
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330 28, 330 75, 330207A, H03F 338
Patent
active
040042464
ABSTRACT:
A pulse width modulated signal amplifier system includes a signal input circuit, an amplifier for receiving an input signal from the signal input circuit, a pulse width modulator for receiving an output signal from the amplifier and producing a pulse width modulated signal, and a phase splitter for receiving the pulse width modulated signal and producing a pair of corresponding pulse width modulated signals having different polarities to each other. The system further includes a first demodulator for receiving one of the pair of pulse width modulated signals and demodulating a first output signal having one polarity and an amplitude in response to the input signal, a second demodulator for receiving the other of the pair of pulse width modulated signals and producing a second output signal having the other polarity and an amplitude in response to the input signal, a load supplied with the first and second output signals, an amplitude comparator for comparing the first and second output signals and producing a control signal in response to the comparison result, and a feedback circuit for receiving the control signal and applying it to the amplifier so as to balance the first and second output signal amplitudes.
REFERENCES:
patent: 3273007 (1966-09-01), Schneider
patent: 3376515 (1968-04-01), Dilley
patent: 3400334 (1968-09-01), Ross et al.
patent: 3585517 (1971-06-01), Herbert
Crowhurst "40 Watts in 40 Ounces! The Two-State Amplifier," Radio-Electronics, Aug. 1965, pp. 35-38.
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