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Temperature Stable Voltage Comparitor

IP.com Disclosure Number: IPCOM000097661D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Dym, H: AUTHOR

Abstract

The Esaki diode voltage comparitor, previously described on page 138 this issue of the IBM Technical Disclosure Bulletin, is modified so as to be temperature insensitive.

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Temperature Stable Voltage Comparitor

The Esaki diode voltage comparitor, previously described on page 138 this issue of the IBM Technical Disclosure Bulletin, is modified so as to be temperature insensitive.

The comparitor requires a bias such that the D. C. load line ordinarily lies on the peak of the diode characteristic (right drawing). The height of the peak changes with temperature and causes considerable drift from the point of switching of the voltage comparitor referred to. This drift is eliminated by using a different load line.

The path of the peak with changing temperature appears to be a straight line as shown. A load line which lies on the path is, therefore, always on the peak, no matter what the temperature is. In this way the device is made completely independent of temperature. The difficulty with such a load line is that there is only one stable state and the diode cannot be switched. This situation is remedied by placing the inductor L1 in series with the diode. This produces an
A. C. load line which permits the diode to switch momentarily.

The complete comparitor circuit is shown at the left. This method of achieving temperature stability is also applicable to a batteryless comparitor referred to. This method has other inherent advantages. The position of the load line is less critical and, even if it should not fall on the locus of the peak, the intersection of the characteristic and the load line are close to the peak value of current, sinc...