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. 11, 1980
Filed:
Mar. 12, 1979
Karl Knauer, Kirchseeon, DE;
Hans-Jorg Pfleiderer, Zorneding, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A transversal filter utilizes a charge transfer device (CTD) shift register having parallel inputs and evaluation circuits assigned to those inputs. The evaluation circuits which form evaluation coefficients by reading-in signal-dependent amounts of charges. The charges are summed in the shift register and the charges successively reaching the output level are read out in series in order to form the filtered output signal. An electric coefficient setting is provided which guarantees a large relative adjustment range having a small requirement for semiconductor surface. The evaluation circuits have separately actuated source zones or additional source zones which are arranged in pairs on opposite sides of the CTD transfer channel, or which are provided with gate oxide and field oxide areas arranged beneath a transfer gate between the evaluation circuits and the shift register. A transversal filter constructed according to the invention is suitable for use as an electrically programmable frequency filter.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile