Impedance adjusting circuit and impedance adjusting method for zero quotient calibration
US12143084B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2023 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | May 16, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An impedance adjusting circuit and an impedance adjusting method for zero quotient (ZQ) calibration. The impedance adjusting circuit includes a reference resistor, a pull-up impedance generator, a controller and a detection circuit. The reference resistor is coupled between a sensing node and a low reference voltage. The pull-up impedance generator is coupled to an external voltage. The controller connects the pull-up impedance generator to the sensing node and compares a reference voltage and a sensing voltage on the sensing node to generate the calibration signal in a ZQ calibrating operation. When the sensing voltage is out of a specification range in the ZQ calibrating operation, the detection circuit notifies the controller to perform a compensation operation on the pull-up impedance generator, and modify the calibration signal to an adjusted calibration signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.