Isolation barrier communication system in a package for isolated gate driver communication

A gate driver system, comprising:

• a first region that operates in a first voltage domain;
• a second region that operates in a second voltage domain lower than the first voltage domain;
• a termination region that electrically isolates the first region and the second region;
• a gate driver arranged in the first region and configured to drive a transistor;
• and
• a communication system configured to transmit a communication signal across the termination region, the communication system comprising:
• a supply generator configured to generate a modulated supply according to a data transmission;
• a light emitting diode (LED) emulator comprising an emulator input coupled to the supply generator and an emulator output configured to output a sense voltage, wherein the emulator input is configured to receive a forward current derived from the modulated supply, wherein the LED emulator is configured to translate the forward current into the sense voltage;
• a voltage comparator comprising a comparator input coupled to the emulator output and comprising a comparator output, wherein the voltage comparator is configured to receive the sense voltage and translate the sense voltage into a modulated output signal based on a communication voltage threshold, wherein the voltage comparator generates the modulated output signal to have a first value on a first condition the sense voltage is equal to or greater than the communication voltage threshold and generates the modulated output signal to have a second value on a second condition the sense voltage is less than the communication voltage threshold;
• a transmitter coupled to the comparator output and configured to receive the modulated output signal and generate a communication signal according to the data transmission based on the modulated output signal;
• and
• a receiver configured to receive the communication signal and demodulate the communication signal.

A method of gate driver communication, comprising:

• generating a modulated supply according to a data transmission to produce a forward current;
• providing the forward current to an emulator input of a light emitting diode (LED) emulator;
• translating, by the LED emulator, the forward current into a sense voltage generated at an emulator output of the LED emulator;
• translating, by a voltage comparator, the sense voltage into a modulated output signal based on a communication voltage threshold, wherein the modulated output signal has a first value on a first condition the sense voltage is equal to or greater than the communication voltage threshold and the modulated output signal has a second value on a second condition the sense voltage is less than the communication voltage threshold;
• and
• generating, by a transmitter, a communication signal according to the data transmission based on the modulated output signal.