Attenuation of spurious responses in electromechanical filters
| DWPI Title: Multiple-pole electromechanical filter for use with e.g. amplifier circuits, has electro acoustic resonator comprising sub-resonators that constitute electro acoustic resonators and are connected to each other in parallel |
| Abstract: A spur cancelling, electromechanical filter includes a first resonator having a first resonant frequency and one or more first spurious responses, and it also includes, electrically connected to the first resonator, a second resonator having a second resonant frequency and one or more second spurious responses. The first and second resonant frequencies are approximately identical, but the first resonator is physically non-identical to the second resonator. The difference between the resonators makes the respective spurious responses different. This allows for filters constructed from a cascade of these resonators to exhibit reduced spurious responses. |
| Use: Multiple-pole electromechanical filter for use with active electronics such as switches and amplifier circuits, used in intermediate frequency applications. |
| Advantage: The filter ensures that the resonant frequency provides a flexible way to integrate filters operating at different frequencies and bandwidths in a single chip, thus minimizing die-to-die variability and simplifying miniaturization. The filter degrades minimum detectable signal to increase required channel spacing, thus reducing efficiency of spectrum utilization and improving performance. The filter reduces size and eliminates a need for large off-chip inductor and capacitor matching components. |
| Novelty: The filter has a first electro acoustic resonator vibrated in first mode shape in response to excitation at first resonant frequency. A second electro acoustic resonator is electrically connected to the first electro acoustic resonator, and vibrated in second mode shape in response to excitation at second resonant frequency. An electro acoustic resonator comprises sub-resonators that constitute electro acoustic resonators and are connected to each other in parallel. The first and second electro acoustic resonators are connected to each other in series. |
| Filed: 3/17/2016 |
| Application Number: US15072611A |
| Tech ID: SD 12794.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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