High-speed low-voltage differential swing transmission line transceiver

Claim 1

A data transmitter for receiving a single-ended binary input signal and converting said single-ended binary input signal to a differential swing binary output signal, said data transmitter comprising: first and second conduction paths connected in parallel between a first node and a second node; first and second MOSFETs connected in series in said first conduction path and third and fourth MOSFETS connected in series in said second conduction path, said first MOSFET being located nearer said first node than said second MOSFET and said third MOSFET being located nearer said first node than said fourth MOSFET; a current source for supplying a supply current to said first and second conduction paths via said first node, and a temperature compensation unit, said temperature compensation unit providing a temperature compensation current which increases with increasing temperature so as to compensate for temperature-induced variations in said supply current; a first input connected in common to a gate of said first MOSFET and a gate of said fourth MOSFET, and a second input connected in common to a gate of said second MOSFET and a gate of said third MOSFET, said first input being for carrying a signal which is high when a signal in said second input is low and said second input being for carrying a signal which is high when a signal in said first input is low; a third conduction path connecting said second node to ground; and a pair of output terminals connected, respectively, to a point in said first conduction path between said first and second MOSFETs and a point in said second conduction path between said third and fourth MOSFETs.