Patent ID: 7796076
Filing Date: 2010-09-14
Classification: G01R,H03K,H03M

Abstract:
1. A circuit, comprising: an analog-to-digital converter for receiving an analog input signal; a transformer having at least one first winding for receiving a modulated output of the analog-to-digital converter and at least one second winding for providing an isolated data output; a demodulator coupled to the at least one second winding of the transformer for demodulating the isolated output to generate a digital representation of the analog input signal; an isolation circuit coupled to the at least one second winding of the transformer for coupling at least one of a clock signal or power supply through the transformer to the analog-to-digital converter, whereby the analog-to-digital converter is supplied with at least one of an isolated clock or an isolated power supply; and a switching power stage control circuit having a modulator output coupled to the at least one second winding for providing an isolated drive signal at the at least one first winding, wherein the modulator output has a rate substantially higher than the switching power stage control circuit control rate; another demodulator having an input coupled to the first winding of the transformer for demodulating the isolated drive signal; and a switching transistor having a gate coupled to an output of the another demodulator, whereby the switching transistor is controlled at the switching power stage control rate.