Receiver front end for digital isolators

A method for receiving signals comprising:

• receiving a received differential pair of signals using an input differential pair of nodes;
• amplifying the received differential pair of signals to generate a first amplified input signal using a first peaking gain stage having a first frequency response including a first peak gain at or near a carrier frequency in a first pass band, the first peak gain occurring just prior to a first cutoff frequency of the first peaking gain stage;
• and
• amplifying the first amplified input signal to generate a differential output signal using a second peaking gain stage having a high input impedance and a second frequency response including a second peak gain at or near the carrier frequency in a second pass band, the second peak gain occurring just prior to a second cutoff frequency of the second peaking gain stage, the first peaking gain stage and the second peaking gain stage having a cascaded peak gain at or near the carrier frequency.

An isolator product comprising:

• a first integrated circuit die operating in a first domain, the first integrated circuit die including a transmitter circuit configured to transmit a signal using an isolation channel;
• and
• a second integrated circuit die operating in a second domain and configured to receive the signal using the isolation channel, the second integrated circuit die including a receiver front-end configured to receive a differential pair of signals on an input differential pair of nodes, the receiver front-end including a first peaking gain stage configured to amplify the received differential pair of signals, the first peaking gain stage having a first frequency response including a first peak gain at or near a carrier frequency in a first pass band, the first peak gain occurring just prior to a first cutoff frequency of the first peaking gain stage, and including a second peaking gain stage configured to amplify a second differential pair of signals generated by the first peaking gain stage, the second peaking gain stage having a high input impedance and a second frequency response including a second peak gain at or near the carrier frequency in a second pass band, the second peak gain occurring just prior to a second cutoff frequency of the second peaking gain stage, the first peaking gain stage and the second peaking gain stage having a cascaded peak gain at or near the carrier frequency.

A control system comprising:

• a controller circuit operating in a first domain;
• a load system operating in a second domain;
• and
• an isolator product providing isolation between the first domain and the second domain and providing a communications channel between the controller circuit and the load system, the isolator product including a receiver front-end operating in the second domain, the receiver front-end including a first peaking gain stage configured to amplify a received differential pair of signals received on an input differential pair of nodes, the first peaking gain stage having a first frequency response including a first peak gain at or near a carrier frequency in a first pass band, the first peak gain occurring just prior to a first cutoff frequency of the first peaking gain stage, and including a second peaking gain stage configured to amplify a differential pair of signals generated by the first peaking gain stage, the second peaking gain stage having a high input impedance and a second frequency response including a second peak gain at or near the carrier frequency in a second pass band, the second peak gain occurring just prior to a second cutoff frequency of the second peaking gain stage, the first peaking gain stage and the second peaking gain stage having a cascaded peak gain at or near the carrier frequency.