Patent ID: 7944287

Claim:
Programmable input offset voltage amplifier circuitry, comprising: first and second input transistors having first electrodes and having control electrodes coupled to first and second input voltages; first and second load devices coupled between a reference voltage and second electrodes of the first and second input transistors, respectively; programmable input offset circuitry including input elements, wherein the programmable input offset circuitry directs a first tail current to be shared between the first and second input transistors, and wherein the programmable input offset circuitry produces programmable internal voltage changes across the input elements so as to produce corresponding changes in voltages of at least one of the first and second input transistors to cause the internal voltage changes to be reflected back to a differential input voltage applied between the control electrodes of the first and second input transistors; and an output stage having a first input coupled to the second electrode of the second input transistor and a second input coupled to the second electrode of the first input transistor.