H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/11, 332/34,
H03F 3/38 (2006.01) H03F 3/217 (2006.01) H03K 7/08 (2006.01)
Patent
CA 1061468
PWM SIGNAL AMPLIFIER ABSTRACT OF THE DISCLOSURE 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 inte- grating circuit integrates the output signal of the subtract- ing circuit. A second amplitude comparator is supplied with the output signal of the integrating circuit and with a refer- ence 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 ter- minal of the bistable circuit to produce a PWM signal to be applied to a pulse amplifier.
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