Patent ID: 8929102
Filing Date: 2015-01-06
Classification: G11C

Abstract:
1. A circuit for sampling a feedback signal representative of an output of a power converter, the circuit comprising: a first sample circuit having an input coupled to receive the feedback signal representative of the output of the power converter, the first sample circuit comprising a first switch coupled to a first capacitor, wherein the first sample circuit is operable to sample the feedback signal and generate a first sample signal based on the sampling of the feedback signal; a second sample circuit having an input coupled to receive the first sample signal from the first sample circuit, the second sample circuit comprising a second switch coupled to a second capacitor, wherein the second sample circuit is operable to sample the first sample signal and generate a second sample signal based on the sampling of the first sample signal; a third sample circuit having an input coupled to receive the second sample signal from the second sample circuit, the third sample circuit comprising a third switch coupled to a third capacitor, wherein the third sample circuit is operable to sample the second sample signal and generate a third sample signal based on the sampling of the second sample signal; and a sample control circuit coupled to the first, second, and third sample circuits, wherein the sample control circuit is operable to: cause the first and second sample circuits to alternatingly sample the signals received at their respective inputs when an output diode of the power converter is conducting; and cause the third sample circuit to sample the second sample signal in response to the output diode of the power converter ceasing to conduct.