Transmitter circuit and semiconductor integrated circuit

摘要

A transmitter circuit includes: a driver that includes an output resistor set to a resistance value according to an input code, and that outputs, to an output terminal, an output signal; and a high potential side resistor and a low potential side resistor that are connected to the output terminal. The transmitter circuit further includes a high potential side current source that is set with a current value according to the input code, and a low potential side current source that is set with a current value according to the input code. The transmitter circuit further includes a high potential side switch and a low potential side switch that switch between allowing current output from the high voltage side current source and the low voltage side current source to pass, and blocking the current.

主权项

1. A transmitter circuit, comprising:
a driver that includes an output resistor set to a resistance value according to an input code, and that outputs, to an output terminal, an output signal according to an input signal; a high potential side resistor provided between the output terminal and a high potential line supplied with a first voltage; a low potential side resistor provided between the output terminal and a low potential line supplied with a second voltage that is lower than the first voltage; a high potential side current source that is provided between the output terminal and the high potential line, that is set with a first current value according to the input code, and that outputs a current from the high potential line toward the output terminal; a low potential side current source that is provided between the output terminal and the low potential line, that is set with a second current value according to the input code, and that outputs a current from the output terminal toward the low potential line; a high potential side switch that is provided between the output terminal and the high potential line, that allows the current output from the high potential side current source to pass through in an ON state, and that blocks the current output from the high potential side current source in an OFF state; and a low potential side switch that is provided between the output terminal and the low potential line, that allows the current output from the low potential side current source to pass through in an ON state, and that blocks the current output from the low potential side current source in an OFF state.