| CPC G01C 3/02 (2013.01) [H03K 17/6871 (2013.01); H04L 25/0272 (2013.01); H04L 25/0282 (2013.01); H04N 25/709 (2023.01); H04N 25/78 (2023.01); H03F 3/45475 (2013.01)] | 15 Claims |
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1. An apparatus comprising:
a plurality of differential transmitters corresponding to a plurality of lanes; and
a power supply circuit that supplies a power supply voltage to each of the plurality of differential transmitters,
wherein the power supply circuit includes:
a common circuit unit that defines the power supply voltage supplied to the plurality of differential transmitters, and
a plurality of individual circuit units provided in association with the plurality of differential transmitters and each connected to the common circuit unit,
wherein each of the plurality of individual circuit units includes a first transistor that forms a source follower circuit and outputs the power supply voltage defined by the common circuit unit, and has an output node that outputs the power supply voltage to a corresponding differential transmitter of the plurality of differential transmitters,
wherein the common circuit unit includes:
a differential amplifier circuit including a non-inverting input terminal, an inverting input terminal, and an output terminal,
a second transistor that forms the source follower circuit and whose gate is connected to the output terminal of the differential amplifier circuit, and
a load element connected between a source of the second transistor and a reference voltage node,
wherein the output node of one of the plurality of individual circuit units and the output node of another of the plurality of individual circuit units are connected to each other, and
wherein the output node of each of the plurality of individual circuit units is connected to a connection node between the source of the second transistor and the load element.
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