Patent ID: 6249154
Filing Date: 2001-06-19
Classification: H03K

Abstract:
A method of controlling a switch of a switched-capacitance device, the switch comprising at least one insulated-gate field-effect transistor, the method comprising:delivering an analog input signal on a source of the transistor;controlling the transistor on its gate, synchronous with a clock signal, to successively turn it on and off, the clock signal having first half-periods during which the transistor is off, and second half-periods during which the transistor is on;precharging a precharging capacitor with a predetermined precharge voltage after each first half-period of the clock signal and at the start of the second half-period, and for a predetermined precharge duration of the second half-period;connecting the precharging capacitor between the source and the gate of the transistor for a remaining duration of the second half-period, to turn the transistor on under a gate-source voltage which is substantially independent of a level of the analog input signal; andapplying a reference potential to the gate of the transistor and the precharging capacitor at an end of the second half-period.