Controller for an acoustic touch panel
US5380959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1992 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Jun 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0436
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A controller for an acoustic wave touch panel includes a signal conditioning circuit that can generate X-axis and Y-axis burst drive signals for a touch panel as well as receive and process X-axis and Y-axis sense signals from a touch panel that can be configured with either one or two transducers per sense axis. The signal conditioning circuit includes a differential amplifier to which simultaneously received X-axis and Y-axis sense signals are applied to provide common mode rejection. The signal conditioning circuit includes a resonant circuit, in each of the X and Y channels, that forms a series resonant circuit through which a burst signal is applied to generate the transducer drive signal. The resonant circuit further forms a parallel resonant circuit of high impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.