The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1992
Filed:
May. 23, 1991
Toshiaki Hanibuchi, Hyogo, JP;
Masahiro Ueda, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A signal applied through a signal input terminal is logically processed by a logic circuit such as a CMOS inverter and the processed signal is supplied from the signal output terminal. A pinch resistor has a resistance value controlled in accordance with a variation of a voltage at the signal output terminal. Specifically, the pinch resistor has a higher resistance value at an initial stage in the switching operation in which an output from the logic circuit lowers from a logical high level to a logical low level, and supplies a large base current to a bipolar transistor. At a later stage in the switching operation, the pinch resistor has a small resistance value, so that a residual charge in the signal output terminal and a base charge in the bipolar transistor are rapidly emitted through the pinch resistor. Thus, the resistance value of the pinch resistor is always maintained at an optimum value, which increases a speed of the switching operation of the logic circuit.