Patent ID: 7714551
Filing Date: 2010-05-11
Classification: G05F

Abstract:
1. A linear voltage regulator for converting a supply voltage to an output voltage, the linear voltage regulator comprising: a transistor having an input terminal for receiving the supply voltage, an output terminal for providing the output voltage, and a control terminal for adjusting a channel width of the transistor; a first monitoring circuit monitoring the output voltage and determining an output-dependent signal, said output-dependent signal being coupled to the control terminal to regulate the output voltage; and a second monitoring circuit coupled to an output of said first monitoring circuit and monitoring the supply voltage, said second monitoring circuit producing an input-dependent signal reflecting a ripple occurring in said supply voltage, said input-dependent signal being coupled to the control terminal of said transistor to adjust the channel width of said transistor in accordance with ripple occurring in said supply voltage, thereby preventing the output voltage from perturbation due to said supply voltage ripple.