Logarithmic current-to-voltage conversion circuit having temperature compensation function
US11169558B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 2019 |
| Grant date | Nov 9, 2021 |
| Priority date | — |
| Expiry date | Dec 9, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Provided is a logarithmic current-to-voltage conversion circuit having a temperature compensation function. The circuit includes a logarithmic current-to-voltage conversion buffer unit, a positive temperature coefficient compensation unit and a self-heating unit. The logarithmic current-to-voltage conversion buffer unit is provided with a reference circuit consistent with a basic logarithmic circuit. A temperature coefficient is reflected by a difference value ΔVbe between an output of the basic logarithmic circuit and an output of the reference circuit. The positive temperature coefficient compensation unit is provided with a voltage-to-current conversion circuit at a first stage and a current mirror at a second stage and outputs a voltage Vout through an resistor R2. The positive temperature coefficient compensation unit is connected to ΔVbe. The voltage-to-current conversion circuit is provided with a resistor R0 and an adjustable resistor R1 connected in series, where a temperature coefficient of (R1+R0)/R2 is corrected by adjusting a value of the adjustable resistor R1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.