JPS6316719U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing one embodiment of a hysteresis circuit according to the present invention, FIGS. 2 to 5 are circuit configuration diagrams showing other embodiments of the present invention, and FIG. 6 is a configuration diagram of a conventional circuit. , FIG. 7 is a switching characteristic diagram of the transistor. Q ₁ to _{Q 7} , Q ₃₀ , Q ₃₁ , Q ₆₀ , Q ₆₁
, Q ₆₂ , Q ₇₀ , Q ₇₁ ...transistor, R
……resistance.

Claims (1)

[Claims for Utility Model Registration] First and second differential pair transistors whose emitters are commonly connected; a resistor connected between the base of the second transistor and a DC voltage; a first current source constituted by a current mirror circuit whose input end is connected to the collector of the transistor and whose output end is connected to the base; emitters of the first and second transistors connected in common; and the second current source. A hysteresis circuit comprising a second current source constituted by a current mirror circuit whose bases of transistors are respectively connected to output terminals and whose input terminal is supplied with a reference current, wherein the first or second current The voltage drop across the resistor is made temperature dependent by making the current supplied by at least one of the current sources temperature dependent, and the hysteresis output is caused by the temperature dependent characteristics of the first and second transistors. A hysteresis circuit characterized by canceling temperature fluctuations in voltage.