Differential CMOS logic with dynamic bias

A CMOS circuit fabricated using a process that can create thick oxide transistors and thin oxide transistors, comprising:

• a differential logic circuit fabricated of thin oxide transistors, and having a plurality of inputs;
• a current source, supplying bias current to the differential logic circuit, the current source fabricated using at least one thick oxide transistor, the current source having a control input that can determine how much current is available to source to the differential logic circuit;
• and
• an adaptive bias control that provides a control signal at the control input of the current source to selectively control the bias current available to the differential logic circuit.

A CMOS circuit fabricated using a process that can create thick oxide transistors and thin oxide transistors, comprising:

• a differential logic circuit fabricated of thin oxide transistors, and having a plurality of inputs, the differential logic circuit comprising a pair of matched thin oxide transistors configured as a differential inverter;
• a current source, supplying bias current to the differential logic circuit, the current source comprising a thick oxide transistor receiving a supply voltage at a drain thereof and coupling a reduced supply voltage to the differential logic circuit through a source thereof, the current source having a control input at a gate thereof that can determine how much current is available to source to the differential logic circuit;
• and
• an adaptive bias control that provides a control signal at the control input of the current source to selectively control the bias current available to the differential logic circuit.