Device incorporating a tunable thin film bulk acoustic resonator for performing amplitude and phase modulation
US5714917A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1996 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Oct 2, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2003/0428
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for amplitude modulating signals, and a circuit that operates in accordance with the method. The method includes a first step of applying a modulating low frequency signal having a time-varying voltage to a tunable resonator. The tunable resonator exhibits parallel and series resonances at frequencies which shift as a function of the time-varying voltage. A second step includes applying an RF carrier signal having a frequency that is between the parallel resonant frequency and the series resonant frequency to the tunable resonator. In response thereto, the tunable resonator causes the RF carrier signal to be attenuated as a function of the time-varying voltage of the modulating low frequency signal. Also provided is a method for phase modulating signals, and a circuit that operates in accordance therewith. A first step includes applying a modulating low frequency signal having a time-varying voltage to a tunable resonator. The tunable resonator yields a maximum phase shift at one of a parallel resonant frequency and a series resonant frequency in response to the modulating low frequency signal. The amount of phase shift yielded is a function of a variation of the modulatin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.