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. 29, 1994
Filed:
Aug. 31, 1992
Pieter Vorenkamp, Eindhoven, NL;
Johannes P Verdaasdonk, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A track-and-hold circuit includes an input stage (IS), an output stage (OS) and a switching stage (SS). The switching stage is coupled between the input stage and the output stage. The switching stage includes a switching transistor (T10), a differential amplifier (T11/T12), a current source (T13/R11), and a capacitor (C11). In order to improve the frequency response, the input stage is provided with a passive impedance coupled between a base of the switching transistor and a first supply terminal (1) and the input stage is adapted to supply a signal current to the base of the switching transistor. This signal current is related to an input signal applied to the input stage. The output stage includes a first output transistor (T14), a first current source (T15) switched by a tracking signal (Vt), a second output transistor (T16), and a second current source.