Closed loop pressure transducer with improved start-up settling

摘要

Improvements in closed loop feedback circuit of the type having both digital circuitry and analog loop compensation circuitry comprising an analog arrangement for temporarily reducing the analog loop compensation circuitry gain, and a digital arrangement operable upon circuit initialization (reset or initial energization) to actuate the analog arrangement for a predetermined time interval to avoid overshoot and reduce the time required to achieve stable loop operation. The loop compensation circuitry typically includes at least one capacitor and the analog arrangement for temporarily reducing the gain may include a resistive shunt temporarily connected in parallel with the capacitor. In one preferred embodiment, there is a resistor connected in series with the resistive shunt by the controlled conduction path of a semiconductor device such as a field effect transistor having its conduction path and its internal resistive shunt connected in parallel with the capacitor.