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:
Apr. 09, 2019
Filed:
Oct. 27, 2016
The Regents of the University of Michigan, Ann Arbor, MI (US);
Myungjoon Choi, Ann Arbor, MI (US);
Dennis Sylvester, Ann Arbor, MI (US);
David T. Blaauw, Ann Arbor, MI (US);
THE REGENTS OF THE UNIVERSITY OF MICHIGAN, Ann Arbor, MI (US);
Abstract
An environmental sensor implementing a sleep mode timer with an oscillator circuit suitable for low power applications is presented. The oscillator circuit includes a plurality of timer stages cascaded in series with each other. Each timer circuit includes a plurality of transistors and operates to output two voltages with opposite polarities, such that the polarities of the two voltages oscillate periodically based on leakage current in the plurality of transistors. Each timer circuit further includes one or more tuning transistors that operate to adjust a frequency at which the polarities of the voltages oscillate. A complementary-to-absolute temperature ('CTAT') voltage generator is configured to receive a regulated voltage and supply a bias voltage to the one or more tuning transistors in each of the plurality of timer circuits, where the CTAT voltage generator adjusts the bias voltage linearly and inversely with changes in temperature.