Patent ID: 7994730
Filing Date: 2011-08-09
Classification: H05B

Abstract:
1. A method for providing an internally generated low noise reference DC voltage in a system that includes at least an analog to digital converter (ADC) circuit connected to a logic circuit, the logic circuit being connected to a pulse width modulator (PWM unit) connected to a filtering circuit arranged to provide the low noise DC reference voltage based upon a PWM output signal, the method comprising: providing a sensed voltage at an input of the ADC; converting the sensed voltage to a digital signal; processing the digital signal by the logic circuit to determine if the sensed voltage is within an acceptable range of voltage values wherein if the sensed voltage is not within the acceptable range, then providing a PWM duty cycle altering feedback signal to the PWM unit; and altering the DC reference voltage based upon the altered duty cycle PWM output signal; and updating the sensed voltage based upon the altered DC reference voltage until the sensed voltage is determined to be within the acceptable range of voltage values.