ACOUSTIC FILTER APPARATUS HAVING CONFIGURABLE PARALLEL RESONANCE FREQUENCIES
First Claim
1. An acoustic filter apparatus comprising:
- an acoustic ladder network configured to;
resonate in a series resonance frequency to pass a signal from an input node to an output node; and
block the signal from the output node in a plurality of parallel resonance frequencies different from the series resonance frequency; and
a microelectromechanical systems (MEMS) switch circuit coupled to the acoustic ladder network and configured to cause a modification to at least one selected parallel resonance frequency among the plurality of parallel resonance frequencies.
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Accused Products
Abstract
An acoustic filter apparatus is provided. In examples discussed herein, the acoustic filter apparatus includes an acoustic ladder network configured to pass a signal in a series resonance frequency and block the signal in a number of parallel resonance frequencies. The acoustic ladder network is coupled to a microelectromechanical systems (MEMS) switch circuit that includes a number of MEMS switches. The MEMS switches may be selectively controlled (e.g., closed and/or opened) to cause a modification to a selected parallel resonance frequency(s) among the parallel resonance frequencies. As such, it may be possible to flexibly configure the parallel resonance frequencies of the acoustic ladder network based on application scenarios. Further, by employing the MEMS switches having improved figure-of-merit (FOM) over conventional silicon-on-insulator (SOI) switches, it may be possible to reconfigure the parallel resonance frequencies with reduced insertion loss, thus helping to improve performance of the acoustic filter apparatus.
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Citations
20 Claims
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1. An acoustic filter apparatus comprising:
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an acoustic ladder network configured to; resonate in a series resonance frequency to pass a signal from an input node to an output node; and block the signal from the output node in a plurality of parallel resonance frequencies different from the series resonance frequency; and a microelectromechanical systems (MEMS) switch circuit coupled to the acoustic ladder network and configured to cause a modification to at least one selected parallel resonance frequency among the plurality of parallel resonance frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification