Switch capacitor interface circuit

摘要

The interface circuit includes a MOSFET coupled between a sensor and a switched capacitor circuit, and a control circuit coupled to the output of the sensor and to the MOSFET. The MOSFET has a gate oxide layer, a switch conducting-state resistance, a gate voltage, and a bulk voltage. The MOSFET connects the output voltage to a switched capacitor circuit. The control circuit continually adjusts the gate voltage and the bulk voltage in relation to the output voltage to prevent a voltage across the gate oxide layer from exceeding a predetermined value corresponding to a Time Dependent Dielectric Breakdown.