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We present a filter for the 2.4 GHz ISM band that has both filtering and balun functionality to deliver a single ended to differential (SE2DE) filter response and 4:1 impedance transformation. We integrate the balun and filter response into a single chip using two FBAR resonators stacked one on top of the other and separated by a thin, low acoustic impedance material. True SE2DE behavior is achieved...
The theory of one dimensional autoregressive lattice parameters, which has been successful in modeling signals such as speech (the voice tract), is extended to the modeling of two dimensional fields. Applications include lattice parameter modeling for purposes of identification, two dimensional digital filter design, and two dimensional spectral estimation. The concept of minimizing forward and backward...
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