Pvt stable voltage regulator

Abstract

An apparatus includes a voltage regulation module configured to provide an output voltage signal (Vout) and an auto-calibration module configured to provide a calibration current signal (Isink) corresponding to a voltage difference between a target voltage signal (Vtarget) and the output voltage signal (Vout). The voltage regulation module may adjust the output voltage in response to changes in the calibration current signal. In one embodiment, the voltage regulation module comprises an output voltage resistor pair of resistance R 1 and R 2 , respectively, and the output voltage signal conforms to the equation Vout=Isink·R 1 +Vref·(1+R 1 /R 2 ).

What is claimed is: 
     
         1 . A method comprising:
 generating an output voltage signal (Vout);   providing a voltage reference signal (Vref);   generating a calibration current signal (Isink) corresponding to a voltage difference between a target voltage signal (Vtarget) derived from a power supply signal and the output voltage signal (Vout);   adjusting the output voltage in response to changes in the calibration current signal;   wherein adjusting the output voltage comprises increasing the output voltage in response to an increase in the calibration current signal and reducing the output voltage in response to a decrease in the calibration current signal;   wherein the calibration current signal is generated by driving a current sink transistor with an operational transconductance amplifier;   wherein Vout is provided by a voltage regulation module comprising a first resistor of resistance R 1  and a second resistor of resistance R 2  and Vout conforms to the equation Vout=Isink·R 1 +Vref·(1+R 1 /R 2 );   wherein Vref is provided by a voltage reference module comprising field-effect transistors (FETs); and   wherein Vout is substantially equal to the target voltage signal (Vtarget).