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:
Jul. 05, 2016
Filed:
Mar. 18, 2015
The Regents of the University of Michigan, Ann Arbor, MI (US);
David T. Blaauw, Ann Arbor, MI (US);
Dennis Sylvester, Ann Arbor, MI (US);
Seok Hyeon Jeong, Ann Arbor, MI (US);
The Regents Of The University Of Michigan, Ann Arbor, MI (US);
Abstract
An ultra-low power oscillator is designed for wake-up timers that can be used in compact wireless sensors, for example. A constant charge subtraction scheme removes continuous comparator delay from the oscillation period, which is the source of temperature dependence in conventional RC relaxation oscillators. This relaxes comparator design constraints, enabling low power operation. In 0.18 μm CMOS, the oscillator consumes 5.8 nW at room temperature with temperature stability of 45 ppm/° C. (−10° C. to 90° C.) and 1%/V line sensitivity.