Calibration of a resistor in a current mirror circuit
US9857824B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2016 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Aug 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A reference stage includes a first transistor, a second transistor and a resistor that are connected in series from a voltage rail to a reference load. The resistor has (i) a resistance that is a function of a digital resistance-controlling value, (ii) a first terminal coupled to a gate of the first transistor, and (iii) a second terminal that has a voltage VG2 and is coupled to a gate of the second transistor. A comparator has a first input that is coupled to the resistor's second terminal. A diode-connected reference transistor is connected from the voltage rail to the comparator's second input to apply a voltage VD at the second input. An adjusting circuit adjusts the digital resistance-controlling value to cause VG2 to approach VD until the comparator's output changes state when VG2 reaches VD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.