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:
May. 31, 1994
Filed:
May. 27, 1993
Martin Rieger, Rottweil, DE;
Sabine Roth, Villingen-Schwenningen, DE;
Deutsche Thomson-Brandt GmbH, Villingen-Schwenningen, DE;
Abstract
A universal filter is provided with three inputs Vh, Vb and V1, with one output Vout, with two transconductance amplifiers Gm1, Gm2, with four capacitors mCO, (1-m)CO, CO and LCO and an amplifier K as well as a voltage follower VF. Depending on the connections of the three inputs, the universal filter takes the form of a high-pass or low-pass or band-pass filter or a trap filter or an all-pass or an otherwise active filter. Advantageously, by selection of parameters (e.g., trans-conductance, gain, scaling), the various filter characteristics like quality (Q), slope, median frequency, amplification, etc., may be adjusted. A further advantage is that the low component count of the filter provides improved reliability, reduced cost and facilitates efficient and economic fabrication in discrete or integrated circuit form.