Patent ID: 9608633
Date: 2017-03-28
CPC Classifications: H03K

Claim:
1. An interface circuit for transmitting a signal, comprising: a pre-driver coupled to receive a single-ended signal, wherein the pre-driver is coupled to convert the single-ended signal to an intermediate differential signal, wherein the intermediate differential signal has a first voltage swing responsive to a first supply voltage supplied to the pre-driver; an output driver coupled to receive the intermediate differential signal from the pre-driver, wherein the output driver is coupled to convert the intermediate differential signal to an output differential signal coupled to be received by a load coupled to the output driver, wherein the output differential signal has a second voltage swing responsive to a second supply voltage supplied to the output driver; an internal regulator coupled to receive a variable supply voltage to supply the second voltage to the output driver, wherein the second supply voltage is generated in response to a bias signal; and a replica bias circuit coupled to receive the variable supply voltage to generate the bias signal coupled to be received by the internal regulator.