Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A pulse-width modulation circuit by which an input signal is pulse-width modulated by means of a carrier signal comprising: first amplifier means having inverting and non-inverting input terminals and a first output terminal, said input signal being applied to one of said inverting and non-inverting input terminals; capacitor means connected between said output and inverting input terminals; comparator means having first and second input terminals and a second output terminal, an output signal from said first amplifier means being applied to said first input terminal and said carrier signal being applied to said second input terminal, said comparator means comparing said output signal from said first amplifier means with said carrier signal to deliver at said second output terminal a pulse signal; and feedback means for feeding back said pulse signal from said comparator means to said inverting input terminal of said first amplifier means, wherein said pulse signal is a pulse-width modulated signal of said input signal.
Claim 2
Dependent Claim
158 words
A pulse-width modulation circuit by which an input signal is pulse-width modulated by means of a carrier signal comprising: first amplifier means having inverting and non-inverting input terminals and a first output terminal, said input signal being applied to one of said inverting and non-inverting input terminals; capacitor means connected between said output and inverting input terminals; comparator means having first and second input terminals and a second output terminal, an output signal from said first amplifier means being applied to said first input terminal and said carrier signal being applied to said second input terminal, said comparator means comparing said output signal from said first amplifier means with said carrier signal to deliver at said second output terminal a pulse signal; and feedback means for feeding back said pulse signal from said comparator means to said inverting input terminal of said first amplifier means, wherein said pulse signal is a pulse-width modulated signal of said input signal.
Claim 3
Dependent Claim
33 words
A pulse-width modulation circuit as claimed in claim 1, in which said first amplifier means is constructed of a non-inverting amplifier arrangement, and said input signal is applied to said non-inverting input terminal.
Claim 4
Dependent Claim
26 words
A pulse-width modulation circuit as claimed in claim 2, in which said inverting input terminal of said first amplifier means is grounded through first impedance means.
Claim 5
Dependent Claim
33 words
A pulse-width modulation circuit as claimed in claim 1, in which said first amplifier means is constructed of an inverting amplifier arrangement, and said input signal is applied to said inverting input signal.
Claim 6
Dependent Claim
35 words
A pulse-width modulation circuit as claimed in claim 4, in which said inverting input terminal of said first amplifier means is connected to an input terminal of the pulse-width modulation circuit through an impedance means.
Claim 7
Dependent Claim
65 words
A pulse-width modulation circuit as claimed in claim 1, further comprising second amplifier means which pulse-amplifies said pulse signal from said comparator means to deliver a pulse-amplified signal, wherein said feedback means feeds back said pulse-amplified signal from said second amplifier means to said inverting input terminal of said first amplifier means and wherein said pulse-amplified signal is a modulated signal of said input signal.
Claim 8
Dependent Claim
31 words
A pulse-width modulation circuit as claimed in claim 1, in which said pulse signal of a pulse-width modulated signal is demodulated by a low-pass filter to be delivered to a load.