Pulse-width modulation circuit
First Claim
1. A pulse-width modulation circuit which comprises:
- (a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal;
(b) capacitor means connected between the inverting input and output terminals of said amplifier means;
(c) comparator means for comparing the output signal of said amplifier means with a reference voltage to output a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of said amplifier means;
(d) delay circuit means responsive to said pulse signal for producing an output pulse signal in delayed relation to said pulse signal for a certain period of time; and
(e) feedback circuit means for feeding the output pulse signal of said delay circuit means back to the inverting input terminal of said amplifier means;
(f) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said delay circuit means.
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Accused Products
Abstract
A pulse-width modulation circuit of self-oscillation type produces a pulse-width modulated signal having a pulse width corresponding to an amplitude of an analog input signal. An integrator having an amplifier and at least one capacitor produces a triangle-wave signal. A comparator compares the triangle-wave signal with a reference voltage to generate a pulse signal. A delay circuit produces a delayed pulse signal in response to the pulse signal generated by the comparator. A feedback circuit feeds the delayed pulse signal back to an input terminal of the amplifier so that the self-oscillation is effected. The pulse-width modulated signal is derived from an output terminal of the delay circuit.
59 Citations
12 Claims
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1. A pulse-width modulation circuit which comprises:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminals of said amplifier means; (c) comparator means for comparing the output signal of said amplifier means with a reference voltage to output a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of said amplifier means; (d) delay circuit means responsive to said pulse signal for producing an output pulse signal in delayed relation to said pulse signal for a certain period of time; and (e) feedback circuit means for feeding the output pulse signal of said delay circuit means back to the inverting input terminal of said amplifier means; (f) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said delay circuit means. - View Dependent Claims (9, 10, 11, 12)
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2. A pulse-width modulation circuit which comprises:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminals of said amplifier means; (c) comparator means for comparing the output signal of said amplifier means with a reference voltage to output a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of said amplifier means; (d) delay circuit means responsive to said pulse signal for producing an output pulse signal in delayed relation to said pulse signal for a certain period of time; (e) pulse amplifier means for amplifying the output pulse signal of said delay circuit means; and (f) feedback circuit means for feeding an output signal of said pulse means back to the inverting input terminal of said amplifier means; (g) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said pulse amplifier means.
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3. A pulse-width modulation circuit comprising:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminals of said amplifier means; (c) inverter means comprised of a CMOS gate for converting the output signal of said amplifier means into a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of the amplifier means; (d) delay circuit means responsive to said pulse signal for producing an output pulse signal in delayed relation to said pulse signal for a certain period of time; and (e) feedback circuit means for feeding the output pulse signal of said delay circuit means back to the inverting input terminal of said amplifier means; (f) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said delay circuit means.
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4. A pulse-width modulation circuit comprising:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminals of said amplifier means; (c) inverter means comprised of a CMOS gate for converting the output signal of said amplifier means into a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of the amplifier means; (d) delay circuit means responsive to said pulse signal for producing an output pulse signal is delayed relation to said pulse signal for a certain period of time; (e) pulse amplifier means for amplifying the output pulse signal of said delay circuit means; and (f) feedback circuit means for feeding an output signal of said pulse amplifier means back to the inverting input terminal of said amplifier means; (g) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said pulse amplifier means.
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5. A pulse-width modulation circuit comprising:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminal of said amplifier means; (c) comparator means for comparing the output signal of said amplifier means with a reference voltage to output a pulse signal, a pulse width of said pulse signal varying in accordance with a signal level of the output signal of the amplifier means; (d) pulse amplifier means for amplifying the pulse signal outputted from said comparator means, said pulse amplifier means outputting an amplified pulse signal in a delayed relation to said pulse signal for a certain period of time; and (e) feedback circuit means for feeding the output pulse signal of said pulse amplifier means back to the inverting input terminal of said amplifier means; (f) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said pulse amplifier means. - View Dependent Claims (6)
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7. A pulse-width modulation circuit comprising:
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(a) amplifier means for amplifying an input signal inputted thereto to develop an amplified output signal from an output terminal thereof, said amplifier means having an inverting input terminal; (b) capacitor means connected between the inverting input and output terminals of said amplifier means; (c) inverter means comprised of a CMOS gate for converting the output signal of said amplifier means into a pulse signal, a pulse with of said pulse signal varying in accordance with a signal level of the output signal of the amplifier means; (d) pulse amplifier means for amplifying the pulse signal outputted from said inverter means, said pulse amplifier means outputting an amplified pulse signal in a delayed relation to said pulse signal for a certain period of time; and (e) feedback circuit means for feeding the output pulse signal of said pulse amplifier means back to the inverting input terminal of said amplifier means; (f) whereby a pulse-width modulated signal having a pulse width corresponding to an amplitude of said input signal appears at an output terminal of said pulse amplifier means. - View Dependent Claims (8)
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Specification