Process, voltage and temperature compensation of off-chip-driver circuits for sub-0.25-/spl mu/m CMOS technology

A control circuit that compensates for variations in process, voltage and temperature (PVT) has been developed to control off-chip-driver circuits used for sub-0.25-/spl mu/m technology. The off-chip-driver (OCD), alone with a simple control scheme, delivers a tight impedance tolerance at the output, improving the output signal waveforms. Across-chip length variation (ACLV), the controlled-circuit design and off-chip-driver performance are also discussed.