Switched capacitor comparator

Details Switched capacitor comparator Switched capacitor comparator

H - Electricity

03

K

328/167, 330/21

H03K 5/24 (2006.01)

Patent

CA 1182872

A SWITCHED CAPACITOR COMPARATOR ABSTRACT A switched capacitor comparator having two or more stages of differential input operational amplifiers utilizing sequentially switched feedback means and feedback capacitors is provided. The use of feedback capacitors in a sequentially switched comparator provides accurate gain and stability. To further reduce offset voltage errors, a solid state transmission gate having a low "on" resistance is disclosed. A transmission gate having capacitors for partially compensating parasitic capacitance effects, a P-channel device and an N-channel device with a switched tub or substrate is provided to compensate parasitic capacitance effects. When the transmission gate is conducting, the tub or substrate of the N-channel device is switched from one of its current electrodes to a reference potential such as ground. Before the transmission gate is opened electrically, a settling time is provided to allow charge which is coupled from parasitic capacitance to settle.

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