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:
Aug. 03, 1999
Filed:
Jan. 28, 1997
D C Sessions, Phoenix, AZ (US);
Sung-Hun Oh, Phoenix, AZ (US);
Elie Georges Khoury, Gilbert, AZ (US);
VLSI Technology, Inc., San Jose, CA (US);
Abstract
An improved output driver that minimizes source point reflections when driving a signal on a transmission line by generating a constant source impedance. The improved output driver uses a transistor switching circuit for generating a nearly constant channel impedance when transistor switching circuit is enabled and is not operating in a saturation mode. A switched diode circuit is coupled in parallel to the transistor switching circuit for generating a nearly constant source impedance when a sufficient voltage to bias the switch diode circuit is applied. Control circuitry is coupled to both the transistor switching circuit and to the switched diode circuit for enabling and disabling the transistor switching circuit and the switched diode circuit. By alternatively enabling and disabling the transistor switching circuit and the switched diode circuit the control circuit is able to generate a constant source impedance.