Digital to analog converter using capacitors and switches for charge distribution
US5696509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Jul 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/667
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A D/A converter is formed of a combination of switches and capacitors. A voltage source supplies a plurality of different predetermined voltages corresponding, respectively, to different logical levels of bit data of input digital data. A first switch device is connected to the voltage source for selecting the different predetermined voltages. A first capacitor is connected to the voltage source by way of the first switch device, and charged by the different voltages selected by the first switch device. A second capacitor is connected to the first capacitor by way of a second switch device, for carrying out distribution of charge between the first and second capacitors. A charge-to-voltage converter circuit is associated with the second capacitor, for converting charge from the second capacitor to voltage. A clock signal generator circuit generates clock signals for selectively driving the first and second switch devices, in synchronism with the bit data of the input digital data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.