Power-efficient, PVT robust conductance cancellation method for gain enhancement

A power-efficient, process, voltage and temperature (PVT) robust g_ds cancellation method for gain enhancement is proposed. The method generates a negative conductance, which matches and cancels the positive conductance. This makes the g_ds cancellation method effective over process and wide temperature variation without the aid of external calibration or a tuning circuit. The method senses signals from cascode nodes instead of output nodes, making the method insensitive to output voltage swing. The simulation results of an example implementation in IBM 0.13 μm process show at least 22 dB DC gain enhancement over all process corners and temperatures ranging from - 20 to 80°C, with less than 9% power consumption overhead.