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:
Feb. 16, 1999
Filed:
Jul. 15, 1997
Shigetoshi Kagomiya, Miyagi-ken, JP;
Toshihiko Kawata, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a waveform shaping circuit for producing a trapezoidal pulse whose leading edge and trailing edge have the same slope and not inducing and radiating harmonic components under any conditions. A waveform shaping circuit comprises a common-emitter transistor 1, a first resistor 2 and second resistor 3 connected in series between a signal input terminal 9 and the base of the transistor 1, a third resistor and first capacitor 5 connected in parallel between a node a between the first resistor 2 and second resistor 2 and a ground, a feedback capacitor 6 connected between the collector of the transistor 1 and the node 1, and a collector load resistor 7 connected in series with the collector of the transistor 1. The waveform of a pulse to be applied to the signal input terminal 9 is reshaped to produce a trapezoidal pulse whose leading edge and trailing edge have a substantially equal slope, and then the trapezoidal pulse is led through a signal output terminal 10. When the waveform shaping circuit is employed in a transmission unit in a communication block in a door control unit included in an on-vehicle multiplex communication network system, the magnitude of induction and radiation of unwanted harmonic components can be reduced drastically.