Fast digital isolator

A circuit comprising:

• a logic module circuit arranged to receive a digital signal D and to generate corresponding first and second command signals, wherein the logic module circuit is referenced to a first ground G1;
• a differential circuit arranged to generate a differential output signal at a first differential terminal B1 and at a second differential terminal B2, wherein the differential output signal corresponds to the digital signal D, the differential circuit comprising:
• a first sawtooth modulator circuit referenced to the first ground G1 and arranged to receive the first command signal, and in response generate a first sawtooth signal at a first node A1;
• a second sawtooth modulator circuit referenced to the first ground G1 and arranged to receive the second command signal, and in response generate a second sawtooth signal at a second node A2;
• a first isolation capacitor coupled between the first node A1 and the first differential terminal B1;
• a second isolation capacitor coupled between the second node A2 and the second differential terminal B2;
• and
• wherein the first differential terminal B1 and the second differential terminal B2 are referenced to a second ground G2;
• and
• wherein the first sawtooth signal has a fast rising edge followed by a slow falling edge when the digital signal D equals 1, and the first sawtooth signal has a fast falling edge followed by a slow rising edge when the digital signal D equals 0.