Back to results
US 4,485,312 AGranted
Hysteresis circuit
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsHiromi Kusakabe, Yoshihiro Yoshida
Life of this patent
Estimating the term…
Abstract
A differential pair of first and second transistors for voltage comparison is provided, and a bias circuit for setting a reference voltage is connected to the base of the second transistor. A differential pair of third and fourth transistors is provided for reference voltage switching. The third and fourth transistors have their bases connected to the collectors of the first and second transistors and their collectors connected to the bias circuit in a positive feedback relation with respect to the base of the first transistor.
Claims4
A hysteresis circuit comprising:
- a first differential pair of first and second transistors each having a collector, an emitter and a base with means for providing operative biasing thereof;
- a second differential pair of third and fourth transistors each having a collector, an emitter and a base with means for providing operative biasing thereof;
- a bias circuit connected between the base of said second transistor and a power supply terminal;
- and
- means for connecting the collectors of said first and second transistors to the bases of said third and fourth transistors, respectively, and connecting the collectors of said third and fourth transistors to different potential points of said bias circuit, respectively, so that said first and second differential pairs are connected in a positive feedback relation with respect to the base of said first transistor when and input is applied thereto.
2 more elements
Dependencies are inferred from the claim text.