Hysteresis comparator

Details Hysteresis comparator Hysteresis comparator

2007-08-28

2007-08-28

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

C327S206000

Reexamination Certificate

active

11358048

ABSTRACT:
A comparator includes a differential amplification circuit having differential input transistors and load transistors, an output transistor for outputting an output value of the comparator, a diode having a cathode connected to a ground, a current output circuit, a resistor connected between an anode of the diode and the bases of the load transistors. When the output transistor is in the OFF state, the diode clamps the voltage of the resistor to a forward voltage so that no current flows through the resistor. When the output transistor is in the ON state, the resistor has a slight voltage so that a slight current flows through the resistor. Thus, a threshold voltage of the comparator has a slight hysteresis without increase in resistance of the resistor.

REFERENCES:
patent: 4384219 (1983-05-01), Davis
patent: A-2003-179469 (2003-06-01), None
patent: A-2004-304515 (2004-10-01), None

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