公开(公告)号：US09513655B1

公开(公告)日：2016-12-06

申请号：US14951317

申请日：2015-11-24

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Min Liu ,  Po-Chia Lai ,  Charles Qingle Wu

IPC: G05F5/00 ,  H03K17/687

CPC classification number: G05F5/00 ,  H04L25/00

Abstract: An interface circuit includes a pre-driver coupled convert a single-ended signal to an intermediate differential signal. An output driver is coupled to convert the intermediate differential signal to an output differential signal having a variable output swing responsive to a mode select signal and a second supply voltage. A replica bias circuit is coupled to receive a first supply voltage, the mode select signal, and an open termination enable signal to generate a bias signal. An internal regulator is coupled to receive the bias signal and the first supply voltage to supply the second voltage to the output driver in response to the bias signal. An open termination circuit is coupled to an output of the output driver, and is coupled to receive the open termination enable signal to couple an internal load to the output of the output driver in response to the open termination enable signal.

Abstract translation: 接口电路包括预驱动器，将单端信号耦合到中间差分信号。 输出驱动器被耦合以响应于模式选择信号和第二电源电压将中间差分信号转换成具有可变输出摆幅的输出差分信号。 复制偏置电路被耦合以接收第一电源电压，模式选择信号和开放终止使能信号以产生偏置信号。 耦合内部稳压器以接收偏置信号和第一电源电压，以响应于偏置信号将第二电压提供给输出驱动器。 开放终端电路耦合到输出驱动器的输出端，并被耦合以响应于开放终止使能信号而接收打开终止使能信号以将内部负载耦合到输出驱动器的输出端。