Power supply decoupling circuit with decoupling capacitor

摘要

A power supply decoupling circuit includes an operational amplifier, a capacitor, a source resistor, and a stabilization circuit. The operational amplifier has a positive input terminal coupled to a first reference voltage, a negative input terminal coupled to a common supply node, and an output terminal. The capacitor is coupled between the common supply node and the output terminal of the operational amplifier. The source resistor is coupled between a supply voltage and the common supply node. The stabilization circuit is coupled between the common supply node and a ground voltage. The stabilization circuit stabilizes a voltage level of the common supply node when the voltage level of the common supply node is below a second reference voltage. The common supply node is configured to drive external circuits with the supply voltage as power supply of the external circuits.

主权项

1. A power supply decoupling circuit, comprising:
a first operational amplifier, wherein the first operational amplifier has a positive input terminal coupled to a first reference voltage, a negative input terminal coupled to a common supply node, and an output terminal; a capacitor, coupled between the common supply node and the output terminal of the first operational amplifier; a source resistor, coupled between a supply voltage and the common supply node; and a stabilization circuit, coupled between the common supply node and a ground voltage, and stabilizing a voltage level of the common supply node when the voltage level of the common supply node is below a second reference voltage, wherein the common supply node is configured to drive external circuits with the supply voltage as power supply of the external circuits.