Method and apparatus for adjusting the static thresholds of CMOS circuits

摘要

An apparatus for adjusting static thresholds of CMOS circuits. The apparatus includes a low reference circuit including at least one channel n-channel MOS device having a back gate and a high reference circuit including at least one p-channel MOS device having a back gate. A feedback loop is provided for providing a control voltage to the back gate of the n-channel NMOS device while a second feedback loop is provided for providing a second control voltage to the back gate of the p-channel MOS device. A control voltage is applied to the first feedback loop while a control voltage is applied to the second feedback loop. The output of the low reference circuit is coupled to the first feedback loop and the output of the high reference circuit is coupled to the second feedback loop.