CPC H04B 1/44 (2013.01) [H03K 3/017 (2013.01); H03K 5/24 (2013.01); H04L 27/04 (2013.01); H04L 27/066 (2013.01)] | 20 Claims |
1. An on-off keying (OOK) digital isolation transceiver, the transceiver comprising:
a transmitter side calibration circuitry including a calibration signal output, the transmitter side calibration circuitry configured to output a calibration signal;
a multiplexer including an isolator input, a calibration signal input, a calibration enable input, and a multiplexer output, the isolator input adapted to receive a data signal, the calibration signal input coupled to the calibration signal output, and the calibration enable input adapted to receive a calibration enable signal, the multiplexer configured to output a signal corresponding to one of the isolator input or the calibration signal input in response to the calibration enable signal;
an OOK modulator including a modulator input and a modulator output, the modulator input coupled to the multiplexer output, the OOK modulator configured to selectively output a transmitted signal having a reference frequency in response to a value of the modulator input corresponding to an on state or an off state of the OOK modulator;
an OOK envelope detector including a detector input, a control input, and a detector output, the OOK envelope detector configured to:
output a signal having a first value in response to detecting a signal received via an isolation barrier;
output a signal having a second value in response to not detecting the signal received via the isolation barrier; and
change a duty cycle of the detector output in response to the control input; and
a receiver side calibration circuitry including a calibration input and a control output, the calibration input coupled to the detector output, the control output coupled to the control input, the receiver side calibration circuitry configured to detect a duty cycle distortion (DCD) of the detector output and to output the control output in response to the detected DCD.
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