Method and apparatus for implementing slew rate control using bypass capacitor

摘要

An example circuit includes a capacitance circuit, a regulator circuit, and a slew rate control circuit. The capacitance circuit is coupled between a first node and a second node. The regulator circuit is coupled to the capacitance circuit to regulate a supply voltage across the capacitance circuit with a charge current during a normal operation mode of the circuit. The slew rate control circuit is coupled to the capacitance circuit and the regulator circuit. The slew rate control circuit is coupled to lower a slew rate of a change in voltage over change in time between the first and second nodes during a power up mode of the circuit. The slew rate control circuit includes a transistor coupled between the first and second nodes to shunt excess current from the charge current.

主权项

1. A circuit, comprising:
a capacitance circuit coupled between a first node and a second node; a regulator circuit coupled to the capacitance circuit to regulate a supply voltage across the capacitance circuit by charging the capacitance circuit with a charge current; and a slew rate control circuit coupled to the capacitance circuit and the regulator circuit, the slew rate control circuit coupled to lower a slew rate of the supply voltage during a power up mode of the circuit, with the supply voltage below a regulation voltage, wherein the slew rate control circuit includes a transistor coupled between the first and second nodes to shunt a portion of the charge current across the capacitance circuit.