Patent ID: 8188722
Filing Date: 2012-05-29
Classification: H02M

Abstract:
1. A method for DC gain improvement of a digitally controlled DC-DC converter including a power stage to convert an input voltage into an output voltage according to a first signal, an analog-to-digital converter to convert an analog signal related to the output voltage into a digital signal, a digital compensator for compensation of the digital signal to generate a second signal, and a digital pulse width modulator to provide the first signal according to the second signal, the method comprising the steps of: checking if the sum of all coefficients in the denominator of a discrete-time domain transfer function of the digital compensator is zero; and if the sum is not zero, tuning the least significant bit of one or more of the coefficients in the denominator of the discrete-time domain transfer function such that the sum of all coefficients in the denominator of the discrete-time domain transfer function of the digital compensator becomes zero.