Simple high resolution monolithic DAC for the tuning of an external VCXO (voltage controlled quartz oscillator)
US5841386A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Jan 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/504
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This invention relates to a high-resolution digital/analogue converter intended in particular for the tuning of a voltage-controlled quartz oscillator. This converter comprises a first second-order Sigma-Delta modulator (1) to the output of which is connected the input of a second Sigma-Delta modulator (9) producing a single bit at its output and a digital/analogue conversion circuit (13). The circuit of the converter furthermore comprises means for filtering the high-frequency components of the signal undergoing processing so as to obtain a quasi-stable D.C. voltage source with a high resolution. This invention is applicable to any voltage-controlled system having large inertia, and in particular, voltage-controlled quartz oscillators and transducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.