Patent ID: 7626426

Claim:
Differential comparator circuitry comprising: replica circuitry comprising: replica bias circuitry that produces a replica bias current; replica input circuitry connected to the replica bias circuitry that receives an input signal and a reference signal and provides a bias signal; and a negative feedback loop that provides a control signal to the replica bias circuitry in response to the bias signal, wherein the control signal maintains the replica bias current substantially constant relative to the input signal; and main circuitry comprising: main bias circuitry that produces a main bias current in response to the control signal, wherein the main bias circuitry is substantially the same as the replica bias circuitry, and wherein the control signal maintains the main bias current substantially constant relative to the input signal; and main input circuitry connected to the main bias circuitry that receives the input signal and the reference signal and provides a comparator output signal, wherein the main input circuitry is substantially the same as the replica input circuitry.