Amplifiers – Modulator-demodulator-type amplifier
Patent
1983-01-04
1985-03-12
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
H03F 338
Patent
active
045047936
ABSTRACT:
A pulse-width modulation circuit is provided which is simple in circuit construction and is free from the non-linearity of a waveform of a carrier signal. The pulse-width modulation circuit comprises an operational amplifier, a comparator and a feedback circuit. The amplifier has inverting and non-inverting input terminals and an output terminal with a capacitor connected between the inverting and output terminals. An input signal to be pulse-width modulated is applied to either one of the inverting and non-inverting input terminals depending upon whether the amplifier is used as inverting or non-inverting amplifier with respect to the input signal. The output from the amplifier is applied to one input terminal of the comparator, to the other input terminal of which a carrier signal, such as a sawtooth wave, a triangular wave, a sinusoidal wave, or other various periodic waves, is applied for the comparison with the input signal. The comparator output is fed back to the inverting input terminal of the amplifier via the feedback circuit. Since the carrier signal is applied to the pulse-width modulation circuit within the feedback loop, the non-linearity of the carrier signal itself gives no adverse effect upon the modulated output from the comparator.
REFERENCES:
patent: 4059807 (1977-01-01), Hamada
Mullins James B.
Nippon Gakki Seizo Kabushiki Kaisha
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