Double rate oversampled interpolative modulators for analog-to-digital conversion
US5030954A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1990 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Sep 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/47
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit transformation that doubles the effective sampling rate of any switched capacitor oversampled, interpolative modulator, regardless of its order, employs, in each integrator of the modulator, a second input capacitor and switches that operate on alternate clock phases. In addition, two quantizers, instead of one, are employed in the network and are operated on opposite clock phases. Alternatively, the quantizers can be operated at twice the normal rate if feasible for the particular circuit. The effective operating rate is thereby doubled without any increase in clock rate or circuit speed requirements, resulting in improved analog-to-digital resolution or conversion rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.