25-02-2021 дата публикации
Номер: US20210058072A1
Принадлежит:
A PWM signal generation and error calibration circuit includes an amplifier OP, an amplifier OP, a comparator CMP, a comparator CMP, PMOS field-effect transistors M-M, a resistor R, a resistor R_FRE, variable resistors R-R, a resistor R, a capacitor C, a matched resistance module circuit, a current drain IDC, and a 14-bit counter. The PWM signal generation and error calibration circuit saves chip costs and supports a wide PWM signal frequency range, while being able to calibrate all duty cycle errors of PWM signals in the range between 0% and 100% with improved accuracy. 1. A PWM signal generation and error calibration circuit , comprising a first amplifier , a second amplifier , a first comparator , a second comparator , a first , a second , a third , a fourth , a fifth , a sixth , a seventh , an eighth , a ninth , a tenth , an eleventh , a twelfth , a thirteenth , a fourteenth , a fifteenth , and a sixteenth PMOS field-effect transistors , a first resistor , a second resistor , a first and a second variable resistors , a third resistor , a first capacitor , a matched resistance module circuit , a current drain , and a 14-bit counter;the first amplifier having a positive input terminal thereof connected to a reference voltage and having an output terminal thereof connected to a gate of the fifteenth PMOS field-effect transistor; the first, second and fifteenth PMOS field-effect transistors and the first resistor being connected in series between a power source and a ground; the first amplifier having a negative input terminal thereof connected between the fifteenth PMOS field-effect transistor and the first resistor;the third and the fourth PMOS field-effect transistors and the first variable resistor being connected in series between the power source and the ground;the fifth and sixth PMOS field-effect transistors and the second variable resistor being connected in series between the power source and the ground;the seventh PMOS field-effect transistor and the ...
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