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:
Dec. 30, 1980
Filed:
Sep. 10, 1979
Karl Knauer, Kirchseeon, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A CTD transversal filter is disclosed which comprises a CTD arrangement with parallel inputs and evaluation circuits. The evaluation coefficients are set up in digital fashion by means of comparator-controlled input sequences of signal-dependent quantities of charge. High value coefficients may be established without the need to reduce a lower frequency transmission limit. With the invention, the transfer electrodes of the CTD are not supplied with the normal clock voltages but with the output voltages of a shift register in which circulates an item of logic information which forwards the input charges individually and consecutively by one electrode spacing. The application of this 'electrode-per-bit' operation results in a considerable increase in the times for the individual input sequences. The invention is useful in programmable frequency filters.