CMOS stabilised DC power source

A new approach for realising a DC power source is reported. Its function is to stabilise power in the presence of resistive load variations. Only linear circuit blocks are required, no analogue multiplier is needed. This is achieved by making the power stabilisation around the nominal operating point and keeping only the first order correction terms in the compensation equation. The error introduction by this approach is smaller than 0.2% for a 10% load variation which corresponds to a stabilisation factor of 50. The circuit was integrated as a driver for the resistor heating element of an air flow sensor co-integrated on the same chip.