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:
Nov. 04, 2003
Filed:
Feb. 13, 2002
Ioannis Chrissostomidis, München, DE;
Thoai-Thai Le, Cary, NC (US);
Infineon Technologies AG, Munich, DE;
Abstract
The invention creates an oscillator circuit, in particular for a refresh timer device of a dynamic semiconductor memory, having a capacitor device (C; C′) which is connected between a first node ( ) and a first supply potential (P ); a current mirror circuit (T ; T ) for supplying a charging current for the capacitor device (C; C′) which is connected via a first transistor device (T ) to the first node ( ) and which has a current source (SQ) for supplying a substantially temperature-independent reference current (Iref); a second transistor device (T ), which is connected between the first node ( ) and the first supply potential (P ); the first and second transistor devices (T ; T ) and a control signal being configured in such a way that the capacitor device (C; C′) can be charged via the first node ( ) when a potential (Vcomp) at the first node ( ) is lower than the reference potential (Vref), and can be discharged via the first node ( ) when the potential (Vcomp) at the first node ( ) is higher than the reference potential (Vref) such that the signal at an output (A) oscillates.