Patent ID: 6590435
Filing Date: 2003-07-08
Classification: H03F,H03K

Abstract:
An apparatus for restricting an output differential voltage (VOD) of an LVDS input buffer, comprising:a differential output voltage circuit configured to produce the output differential voltage (VOD), the differential output voltage circuit having an input coupled to an input signal, a first output coupled to a first output signal and a second output coupled to a second output signal; a first offset circuit configured to produce a first offset signal, the first offset circuit having an input coupled to the first output signal and an output coupled to the first offset signal; a second offset circuit configured to produce a second offset signal, the second offset circuit having an input coupled to the second output signal and an output coupled to the second offset signal; a first clamping circuit configured to restrict the VOD to be below a predetermined threshold, the first clamping circuit having an input coupled to the input signal, and an output coupled to the first offset signal; and a second clamping circuit configured to restrict the VOD to be below the predetermined threshold, the second clamping circuit having an input coupled to the input signal and an output coupled to the second offset signal.