A technique for high-speed circuits on SOI using look-ahead type active body bias control

We propose an approach for higher performance on SOI employing Look-Ahead type Active Body Bias (LA-ABB) method to control the threshold voltage (V/sub th/) of transistors dynamically. Although conventional ABB method using subsidiary transistors has been less effective for high-speed circuits due to delay of body bias voltage, we improve performance by using signals from previous stages or by focusing on difference of signal arrival times. Experimental results by circuit simulation have shown that our technique is effective to shorten delay time even with high-speed circuits on SOI.