A pulse width modulation circuit
A pulse width modulation and circuit technology, applied in the direction of pulse duration/width modulation, etc., can solve the problems of poor anti-interference ability of PWM circuits, achieve the effects of improving accuracy and system stability, reducing coupling interference, and avoiding glitches
Inactive Publication Date: 2016-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is the problem that the anti-interference ability of the PWM circuit in the prior art is poor, and a high-precision PWM circuit with strong anti-interference ability is provided
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[0016] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative labor achievements fall within the protection scope of the present invention.
[0017] Such as figure 2 As shown, the pulse width modulation circuit of the present invention includes a voltage-controlled current source circuit VCCS, a first comparator COMP1 and a second comparator COMP2. Among them, the voltage-controlled current source circuit VCCS realizes the oscillator output voltage V C_R Shaping, through the voltage-controlled current source circuit VCCS to realize the V C_R Phase and amplitude modulation of the voltage, converting the oscillator output voltage to the input signal...
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The present invention relates to pulse modulation circuits. Aiming at the problem of poor anti-interference capability of PWM circuits in the prior art, the present invention discloses a pulse width modulation circuit, the technical solution of which includes a first comparator, a second comparator and a voltage-controlled current source circuit; the voltage-controlled current The input terminal of the source circuit is connected to the output voltage of the oscillator, and the output voltage of the oscillator is converted into a signal complementary to the input signal and input to one input terminal of the first comparator, and the other input terminal of the first comparator is connected to the output signal of the error amplifier, the first The output terminal of the comparator outputs the first PWM signal; one input terminal of the second comparator is connected to the oscillator output voltage, the other input terminal of the second comparator is connected to the output signal of the error amplifier, and the output terminal of the second comparator outputs the first PWM signal. Two PWM signals. The invention utilizes a completely symmetrical triangular wave signal to generate a required PWM signal, avoids the occurrence of burrs, reduces coupling interference, and effectively improves the accuracy of the sampling circuit and system stability.
Description
technical field [0001] The technical field of integrated circuits of the present invention particularly relates to a pulse width modulation (PWM) circuit. Background technique [0002] In electronic systems, PWM circuits often provide pulse modulation signals for the entire circuit system, adjust the duty cycle of pulses, and realize various circuit functions. It is an indispensable functional module. The traditional PWM circuit generally uses a comparator to output the oscillator output signal V C_R (typically a triangle wave) and the error amplifier output voltage V EAO A comparison is made to generate a square wave (PWM signal) with a duty cycle determined by the feedback signal. However, there is usually a coupling capacitance between the two signal lines of the PWM comparator in an electronic system, and the pulse transition on one signal line will damage the signal on the other signal line. Such a PWM comparator has low anti-interference ability. It causes glitches ...
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IPC IPC(8): H03K7/08
Inventor 周泽坤张庆岭张其营张瑜石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA