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:
Feb. 13, 1996
Filed:
May. 13, 1994
Christian J Goetschel, Rochester, MN (US);
Robert A Greene, Rochester, MN (US);
Robert A Kertis, Rochester, MN (US);
Rick A Philpott, Rochester, MN (US);
Raymond A Richetta, Rochester, MN (US);
Timothy J Schmerbeck, Kasson, MN (US);
Donald J Schulte, Rochester, MN (US);
David P Swart, Pine Island, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An integrated biquadratic, continuous-time filter section includes a plurality of operational transconductance amplifiers (OTAs). Simutaneously changing a transconductance (GM) of each of the OTAs is provided by adjusting a differential voltage applied to a plurality of differential transistor pairs of each OTA. Each of the OTAs include a plurality of current sources and a common mode feedback circuit for controlling a common mode output voltage level. Changing the transconductance of the OTA is independent of the common mode voltage level control.