Current cell for digital-to-analog converter
US5331322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Dec 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/04106
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This invention relates to a current cell playing a role as a current switch source in a digital-to-analog converter. According to the present invention, the current cell assembled by both p-type MOS transistor M1 for current supply and p-type MOS transistor M2 and M3 for symmetrical operation, comprises: an inverting means consisting of p-type and n-type MOS transistor M5 and M4, where the digital input signal Di is applied to each of gate terminal and where the source terminal is connected to power supply terminal Vdd and ground terminal GND; a transmission means consisting of n-type MOS transistor M7, where the digital input signal of Di is applied to its gate terminal and power supply voltage Vdd is applied to its source terminal, and p-type and n-type MOS transistors M6 and M8, where the digital input signal Di and the output signal of the said inverting means is applied to each of their gate terminal, respectively. The output signal from the said inverting and transmission means is applied to the gate terminals of the said p-type MOS transistors M2, M3 respectively. The features of the current cell is apparent in that the signal symmetrical to MOS transistors M2 and M3 can rea…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.