Voltage comparator circuit having hysteresis characteristics of

Details Voltage comparator circuit having hysteresis characteristics of Voltage comparator circuit having hysteresis characteristics of

1990-09-24

1992-01-07

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307355, 307530, 307360, 307291, H03K 5153, H03K 522

Patent

active

050794434

ABSTRACT:
Since the resistor is inserted between each of the emitters of the transistors to which the comparison voltage is applied and each of the collectors of the differential pair of transistors, a positive feedback is applied at different points where a differential input voltage is increased from the negative and it is decreased from the positive, and thus the voltage comparator circuit has the hysteresis characteristics. It is therefore possible to reliably have the hysteresis characteristics of a narrow range of voltage of 100 mV or less (for example, several tens of millivolts) without increasing the number of elements in use or depending upon the value of k.multidot.T/q (k is the Boltzmann's constant, T is an absolute temperature, and q is an amount of charge of electrons).

REFERENCES:
patent: 4506170 (1985-03-01), Mizuide

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