Ring oscillator temperature sensor
AssigneeBirad—Research & Development Company Ltd.
InventorsJoseph Shor, Natan Vinshtok-Melnik
Life of this patent
Estimating the term…
Abstract
A sensor circuit includes at least one ring oscillator having a supply port supplied by at least one current source and a reference frequency. A comparator compares a frequency output of the at least one ring oscillator with the reference frequency to yield a measurement, such as a temperature measurement.
Claims15
A sensor circuit comprising:
- a first ring oscillator and a second ring oscillator, and a feedback loop coupled to said first and second ring oscillators such that currents in said first and second ring oscillators are equal or scaled and are determined by said feedback loop, wherein said first and second ring oscillators operate in a subthreshold region.
A sensor circuit comprising a first ring oscillator and a second ring oscillator wherein a current density of said second ring oscillator is a scaled multiple of a current density of said first ring oscillator, and wherein said first and second ring oscillators operate in a subthreshold region, and wherein said first and second ring oscillators operate in a subthreshold region.
Dependencies are inferred from the claim text.