Patent ID: 8786321

Claim:
A transmitter comprising: a channel including: a differential output line; a first differential circuit including: a differential input configured to receive a differential input signal, and a differential output coupled to the differential output line of the channel; and a first control circuit coupled between the differential output of the first differential circuit and the differential output line of the channel, the first control circuit having an input configured to receive a first control signal, wherein the first differential circuit includes a p-channel MOSFET, wherein the differential output line is configured to couple to a receiver, wherein the first differential circuit is configured to draw current from the receiver, wherein a voltage of the first control signal is less than or equal to a voltage of a power supply signal recovered from the current drawn from the receiver plus a threshold voltage of an n-channel MOSFET plus a threshold voltage of a p-channel MOSFET, wherein the first control signal is provided by a control signal generating circuit having one or more components supplied by a power supply voltage recovered from a drive signal provided at a terminal of the first differential circuit, wherein: the transmitter further comprises the control signal generating circuit; the control signal generating circuit includes: a second differential circuit driven by the differential input signal; and a voltage controller for controlling a voltage of the first control signal in response to a voltage control signal.