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:
Mar. 01, 2005
Filed:
Jun. 12, 2003
Franz Prexl, Niederding, DE;
Wolfgang Steinhagen, Mauern, DE;
Ralph Oberhuber, Kumhausen/Landshut, DE;
Franz Prexl, Niederding, DE;
Wolfgang Steinhagen, Mauern, DE;
Ralph Oberhuber, Kumhausen/Landshut, DE;
Texas Instruments Deutschland, GmbH, Freising, DE;
Abstract
A voltage follower comprising a first field-effect transistor (MN) whose gate forms the input of the voltage follower. Further provided is a second field-effect transistor (MN) whose drain connected to the gate forms the output of the voltage follower. The sources of the two field-effect transistors (MN, MN) are connected to each other and to the drain of a third field-effect transistor (MN) serving as current source and to the gate of which a predefined bias voltage is applied. The invention employs in addition a fourth field-effect transistor (MN) whose source-drain path is circuited between the output of the voltage follower and the drain of the third field-effect transistor (MN) and whose gate is connected to the gate of the third field-effect transistor (MN). As compared to prior art voltage followers the voltage follower in accordance with the invention comprises a wider voltage range in which it can be put to use. This can be made use of e.g. in amplitude shift-keyed (ASK) demodulators incorporating the voltage follower in accordance with the invention and which need to be operated with particularly small supply voltages.