Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-04-23
1985-06-11
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307362, 330107, 328146, G06G 714, H03K 522
Patent
active
045231079
ABSTRACT:
A switched capacitor comparator having two or more stages of differential input operational amplifiers utilizing sequentially switched feedback portions 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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Krummenacher, "Micropower Switched Capacitor Biquadratic Cell", Seventh European Solid State Circuits Conference, Freiburg, Germany, Sep. 22-24, 1981.
Callahan Timothy P.
King Robert Lee
Miller Stanley D.
Motorola Inc.
Myers Jeffrey Van
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