| 摘要 |
A pulse-width modulator (PWM) accommodates a wider range of output pulse widths, with less gain variation, when compared to conventional circuits. The PWM can operate without requiring a voltage reference. In one example PWM, a ramp generator in the PWM includes a capacitive element that is charged by a current from a trans-conductance cell that is responsive to the input voltage and a power supply voltage. In another example PWM, the ramp generator cell in the PWM includes a follower circuit that is responsive to the input voltage. The PWM is suitable for use in a variety of applications including switching power converters.
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