Patent ID: 9698728
Date: 2017-07-04
CPC Classifications: H03D,H04L

Claim:
1. A digital isolator, comprising: an isolation element comprising at least one input node and at least one output node; an input circuit electronically coupled to the at least one input node, the input circuit configured to receive an input data signal and generate modulated differential data signals based on modulating the input data signal on a carrier signal of a carrier frequency, and operate using a first supply voltage with respect to a first ground, and the input circuit positioned to provide the modulated differential data signals to the at least one input node; and an output circuit electronically coupled to the at least one output node such that the output circuit is positioned to receive the modulated differential data signals, the output circuit configured to operate using a second supply voltage with respect to a second ground, wherein the input circuit includes an on-off keying (OOK) modulator configured to generate a modulated data signal in response to the input data signal and the carrier signal, the input circuit generating the modulated differential data signals based on the modulated data signal, and wherein the output circuit includes a frequency-shift keying (FSK) demodulator configured to detect a presence of the carrier signal in the modulated differential data signals and generate a demodulated data signal in response to the presence of the carrier signal, the output circuit being further configured to generate an output data signal in response to the demodulated data signal.