Temperature sensor with reduced power supply voltage sensitivity
US11018654B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2020 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Jun 11, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/011
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Circuitry for determining temperature of an integrated circuit device includes, on the device, a ring oscillator and a bias current generator. The bias current generator is selectably operable in (i) a first mode having a first sensitivity to device temperature or (ii) a second mode having a second sensitivity to device temperature, to provide bias current for the ring oscillator. A controller operates the bias current generator in the first mode and records a frequency output of the ring oscillator, then operates the bias current generator in the second mode and records a frequency output of the ring oscillator, and determines the temperature of the integrated circuit device from a ratio of (a) the frequency output of the ring oscillator while the bias current generator operates in the first mode to (b) the frequency output of the ring oscillator while the bias current generator operates in the second mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.