Multiplexer for a piezo ceramic identification device
US6812621B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Jul 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N39/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multiplexer for a biometric apparatus having at least fifty thousand piezo ceramic sensor elements arranged in a two-dimensional array on a pitch spacing equal to or less than approximately two hundred microns. The multiplexer includes a plurality of first and second orthogonal conductors. Each of the first conductors is coupled to Y piezo ceramic sensor elements. Each of the second conductors is coupled to X piezo ceramic sensor elements. Switches couple the first conductors to either an output port of a signal generator, a high impedance node, or a low impedance node. Switches also couple the second conductors to either an input port of a processor, a high impedance node, or a low impedance node. Shift registers coupled to the switches are used to control the position of the switched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.