Patent ID: 7940077

Claim:
A waveform processing apparatus comprising: an integrated circuit that comprises: a signal processing stage to process a signal within the integrated circuit; and a termination stage to terminate the signal within the integrated circuit with a termination impedance, the termination stage comprising: an integrated resistor having a first impedance; a tuning circuit having a second impedance set in response to a tuning signal received by the tuning circuit, the tuning circuit being tunable without the use of a reference resistor, wherein the termination impedance comprises an electrical combination of the first impedance and the second impedance; wherein the tuning circuit comprises a first transistor and a second transistor having channels of opposite type material and being connected in parallel, wherein the resistance of the parallel transistors is substantially independent of voltage applied across the transistors when gate-to-source voltages of the transistors are substantially equal in magnitude and opposite in sign.