Transmitter circuit harvesting power from power supply of a receiver circuit
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United States of America Patent
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Sep 4, 2018
Grant Date -
Mar 8, 2018
app pub date -
Sep 2, 2016
filing date -
Sep 2, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A transmitter (TX) circuit harvesting power from a power supply of a receiver (RX) circuit is disclosed herein. The TX circuit for data transmission over a differential channel comprises a driver circuit coupled with the differential channel across a first pair of resistors. One terminal of each resistor of the first pair coupled together at a common mode voltage node. The differential channel is series terminated at the RX circuit by a second pair of resistors to a power supply node of the RX circuit. The driver circuit includes a differential pair and a current source drawing current from the power supply node of the RX circuit. A pre-driver circuit coupled with the driver circuit provides an output of the pre-driver circuit as an input to the driver circuit. At least the pre-driver circuit is powered from the common mode voltage node of the driver circuit.
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