Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.

Coupled bulk acoustic wave resonator filters: key technology for single-to-balanced RF filters

Abstract: Coupled Resonator Filters (CRF) are a new type of Bulk Acoustic Wave (BAW) device in which two piezoresonators are stacked on top of each other in a way that a certain degree of acoustic interaction occurs. CRFs feature complete galvanic isolation between input and output and thus enable to offer BAW filters with mode-conversion (single-ended to balanced) as well as impedance transformation. The basic concept behind these devices is reviewed. The size of a CRF BAW filter is excitingly small as compared to SAW filters. First experimental results for CRFs operating at 1.8 GHz which have been manufactured at Infineon Technologies will be presented. Certain manufacturing issues are discussed and measurements of the temperature coefficient TCF are shown.

High frequency module

Abstract: PROBLEM TO BE SOLVED: To achieve the miniaturization of a module as a whole, the reduction of loss, and high isolation by arranging a means for miniaturizing a switch circuit to change over transmission and reception, for saving current consumption, and for adjusting matching between an antenna terminal and a switch, and also raising resistance against the high-voltage serge of the switch. SOLUTION: On the front surface of or at the inside of a multilayer board A obtained by alternately laminating dielectric layers and conductor layers, a high frequency module includes: a branching filter circuit which is connected to an antenna terminal so as to divide a plurality of transmission/reception systems different in pass bands into individual transmission/reception systems; a switch circuit which is connected to the branching filter circuit so as to change-over the respective transmission/reception systems into transmission systems and reception systems; a power amplifier circuit which is connected to the switch circuit so as to amplify a transmission signal in the pass band of each transmission system; and a matching circuit for the power amplifier circuit. The power amplifier circuit and the switch circuit are mounted on the front surface of the multilayer board A as high-frequency semiconductor integrated circuit elements. COPYRIGHT: (C)2005,JPO&NCIPI

Optimized size design of integrated magnetic components using area product approach

Abstract: Substantial reductions in size and costs of magnetic components and power supplies can be achieved by an integration of magnetic components on one core. So far, no adequate method is known for computerized design of integrated magnetics. In this contribution, an optimized size design approach of integrated magnetic components using area product formulation is presented. In a first step, optimal flux density and area product values are determined for discrete multiple-winding inductors and transformers. Using these results in a second step, optimal area products are calculated for integrated magnetic components, consisting of e.g. transformer and either resonant or filter inductor

Bulk acoustic wave coupled resonator filters synthesis methodology

Abstract: This paper presents a synthesis methodology applied to bulk acoustic wave coupled resonator filters (BAW CRF). BAW-CRFs are able to realize wider bandwidth and higher rejection filter responses, but they present smoother roll-off coefficients compared to classical ladder topology. The proposed methodology enables to determine the filter structure dimensions able to synthesize Chebyshev responses. Finally, we address the design of an RF filter applied to the W-CDMA system employing the proposed methodology.