Amplifiers – Modulator-demodulator-type amplifier
Patent
1976-02-23
1977-03-29
Grimm, Siegfried H.
Amplifiers
Modulator-demodulator-type amplifier
307228, 332 9R, 332 14, H03F 338, H03K 708
Patent
active
040152138
ABSTRACT:
A pulse width modulated (PWM) signal amplifier includes an input terminal supplied with an input signal to be modulated, a sawtooth wave generator, and a first amplitude comparator supplied with the input signal and with the output signal of the sawtooth wave generator to produce a first control signal each time the amplitudes of the both signals become equal. A bistable circuit having first, second and third terminals is provided, in which the first terminal is supplied with the first control signal. A subtracting circuit is connected to receive the input signal supplied to the input terminal and the output signal from the second terminal of said bistable circuit and to combine these signals subtractively. An integrating circuit integrates the output signal of the subtracting circuit. A second amplitude comparator is supplied with the output signal of the integrating circuit and with a reference signal to produce a second control signal each time the amplitudes of signals applied to the second comparator become equal, the second control signal being applied to the third terminal of the bistable circuit to produce a PWM signal to be applied to a pulse amplifier.
REFERENCES:
patent: 3413570 (1968-11-01), Bruene et al.
patent: 3585517 (1971-06-01), Herbert
Eslinger Lewis H.
Grimm Siegfried H.
Sinderbrand Alvin
Sony Corporation
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