Importance

Loading Importance Indicators...

Abstract

The invention relates to methods and apparatus that efficiently convert a single-ended input signal to a differential output signal at high speeds so that a non-inverted differential output and an inverted differential output maintain a true differential phase relationship even at relatively high frequencies of input data. A single-to-differential input buffer circuit includes multiple paths from the input signal to the differential output signals and transitions relatively quickly from a first state to a second state in response to a change in state of the input signal. An input phase-splitting stage of the single-to-differential input buffer circuit includes cross-coupled positive feedback to dramatically increase the frequency response of the phase-splitting stage. Advantageously, the single-to-differential input buffer also includes cross-coupled transistors that compensate for a portion of the positive feedback to prevent latch-up and yet retain the speed advantages of the cross-coupled positive feedback. One embodiment maintains the transistors of the input stage in a linear region.

Loading the Abstract Image...

First Claim