Operational amplifier module and method for increasing slew rate of operational amplifier circuit

摘要

An operational amplifier module including an operational amplifier circuit, a rate-increasing circuit and an overdriving circuit is provided. The operational amplifier switches an input voltage to an output voltage and outputs the switched output voltage. The rate-increasing circuit receives the input voltage and the output voltage and increases the rate of switching the input voltage to the output voltage according to the difference between the input voltage and the output voltage. The overdriving circuit provides an overdriving voltage to the rate-increasing circuit and the operational amplifier circuit during an overdriving period according to a selection signal. The level of the overdriving voltage is higher or lower than the levels of the input voltage and the output voltage. Furthermore, a method for increasing the slew rate of the operational amplifier circuit is provided.

主权项

1. An operational amplifier module, comprising:
an operational amplifier circuit, configured to switch an input voltage to an output voltage and output the output voltage; a rate-increasing circuit, coupled to the operational amplifier circuit and configured to receive the input voltage and the output voltage, wherein the rate-increasing circuit increases a rate of switching the input voltage to the output voltage according to a difference between the input voltage and the output voltage; and an overdriving circuit, coupled to the rate-increasing circuit and configured to provide an overdriving voltage to the rate-increasing circuit and the operational amplifier circuit during an overdriving period according to a selection signal, wherein a level of the overdriving voltage is higher or lower than levels of the input voltage and the output voltage.