UNIVERSAL INPUT BUFFER

摘要

A universal input buffer has a pair of input pins. A first input of a multiplexer is coupled to the second input pin and a second input of the multiplexer receives a common mode voltage of a differential signal applied to the first pin. The multiplexer is responsive to a selection signal to select either of the first and second inputs of said multiplexer. A pair of single-input buffers have inputs coupled respectively to the first and second input pins. A first input of a first differential buffer is coupled to the first input pin, a first input of a second differential buffer is coupled to the second input pin, the second input of the first differential buffer is coupled to the output of the multiplexer, and the second input of the second differential buffer receives a common mode voltage of a differential signal applied to the second pin.

主权项

1. A universal input buffer comprising:
first and second input pins; a multiplexer with first and second inputs and an output, the first input of the multiplexer being coupled to the second input pin and the second input of the multiplexer being for receiving a common mode voltage of a differential signal applied to said first pin, said multiplexer being responsive to a selection signal to select either of said first and second inputs of said multiplexer; first and second single-input buffers, having an inputs coupled respectively to said first and second input pins; first and second differential buffers, each of said first and second differential buffers having first and second inputs, the first input of the first differential buffer being coupled to the first input pin, the first input of the second differential buffer being coupled to the second input pin, the second input of the first differential buffer being coupled to the output of the multiplexer, and the second input of the second differential buffer being for receiving a common mode voltage of a differential signal applied to said second pin.