Patent ID: 9118343
Filing Date: 2015-08-25
Classification: H03M

Abstract:
1. A delta-sigma modulator circuit for a switched mode power converter controller, the delta-sigma modulator circuit comprising: a low-pass filter circuit coupled to receive an input voltage to the switched mode power converter and configured to output a filtered input voltage; a switched capacitor coupled to selectively receive, at a first terminal of the switched capacitor, one of the filtered input voltage, a maximum boundary voltage, and a minimum boundary voltage, and to output, at a second terminal of the switched capacitor, an amount of electric charge, a switched-capacitor integrator circuit with an integrating capacitor, wherein the switched-capacitor integrator circuit is coupled to receive, at an input terminal, the electric charge, and to output, at an output terminal, an integral voltage based on the electric charge and a supply voltage; and a switched comparator circuit coupled to receive the integral voltage, compare the integral voltage with a reference voltage, and output a digital output signal representative of the filtered input voltage.