Pipeline analog-to-digital converter with common mode following reference generator
US6486820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Aug 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/442
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pipeline analog-to-digital converter (ADC) includes cascaded stages for resolving at least one bit of an analog voltage. Each stage has an analog input, one or more reference voltage inputs, and one or more digital outputs. The analog voltage is coupled to the analog input of the first stage. Each stage but the last has an analog output connected to the analog input of the next stage, and includes an operational amplifier that has one or more differential amplifiers having a common mode voltage. The pipeline ADC includes a reference generator to generate the one or more reference voltages for the stages. The reference generator includes a circuit to track the common mode voltage of the differential amplifiers such that the generated reference voltages are relative the common mode voltages of the differential amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.