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:
Jun. 13, 1995
Filed:
Feb. 03, 1994
Mark D McDonald, Fremont, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A switchable impedance circuit and method for maintaining a controlled signal line (e.g. RF transmission line) impedance at a circuit node includes a circuit and method for connecting a switchable impedance in shunt or series, or in a shunt and series combination. The switchable impedance can be selectively switched, e.g. 'on' or 'off', when the circuit is being powered up or down, or both, so as to maintain the desired, e.g. characteristic, impedance at the node of the signal line to which it is connected, for example by providing the complex conjugate of, or vectorially matching, any complex impedance present at such node, thereby advantageously helping to minimize undesirable transient signal effects, such as circuit ringing or oscillator frequency pulling.