Apparatus and method for monotonic digital calibration of a pipeline analog-to-digital converter
US5861828A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Oct 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/44
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and circuit for performing a monotonic digital calibration of a pipeline analog-to-digital (A/D) converter calibrates each stage of the pipeline A/D converter while using the actual input A/D converter of the stage then being calibrated. The digital output from the stage is converted to an analog signal (e.g., integrated) and fed back for use as the analog input to the stage. This ensures that the digital output from the stage has a symmetrical waveform and that the analog input voltage to the stage remains at the input threshold level. The remaining downstream pipeline A/D converter stages are then used to measure the levels of the binary residue voltage corresponding to the two states of the binary stage output so that appropriate calibration data can be generated and stored for use in calibrating that stage. By repeating this process for each successive upstream pipeline A/D converter stage the entire pipeline A/D converter can be calibrated to help ensure the monotonicity of its A/D conversion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.