Patent ID: 8723592

Claim:
A circuit-based apparatus comprising: a first body bias island that is configured to provide body bias to at least a first well; a second body bias island that is configured to provide body bias to at least a second well; and a body bias switch circuit configured and arranged to operate in different modes in response to a bias-mode input, the body bias switch circuit including a switch having a first terminal coupled to the first well and a second terminal coupled to the second well, the different modes involving control of the different modes including: a first mode that places each of the first well and the second well into a first bias condition that includes, for each of the first and second wells, one of a reverse body bias, a nominal body bias and a forward body bias; a second mode that places each of the first well and the second well into a second bias condition that includes, for the first well, a different one of a reverse body bias, a nominal body bias and a forward body bias; and a third mode that places the first well and the second well in a third bias condition that is different from the first and second bias conditions.