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Transversal filter comprising an improved falling characteristics

A transversal filter, filter technology, applied in the direction of impedance network, electrical components, etc., can solve the transmission characteristics of insufficient attenuation characteristics, no effect, low selectivity, etc., to achieve the effect of improving the drop characteristics

Inactive Publication Date: 2007-03-28
快速追踪有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, however, this software-optimized measurement correction does not have the desired effect
In particular such a non-optimized filter may have a transmission characteristic which exhibits an insufficient attenuation characteristic for certain frequencies
Such a frequency response curve may have very low selectivity, e.g. compared to adjacent channels or to interfering frequencies, e.g. image frequencies

Method used

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  • Transversal filter comprising an improved falling characteristics
  • Transversal filter comprising an improved falling characteristics
  • Transversal filter comprising an improved falling characteristics

Examples

Experimental program
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Embodiment Construction

[0016] FIG. 1 shows, roughly not to scale, a known transversal filter with an input transducer B and an output transducer A, which are arranged on the surface of a piezoelectric substrate. In the indicated figures the input transducers are formed as overlapping weighted fingered transducers and the output transducer A is formed as an unweighted normal interdigital transducer. The diagram of the branching described for the example W represents the envelope of the superposition lengths of adjacent electrode fingers starting from different busbars. The output transducer A also has a shorter length than the input transducer B.

[0017] When the filter is working, the input signal is applied to the connection terminal T B 1 and T B 2, while at the connection terminal T A 1 and T A 2 can intercept the output signal.

[0018] Figure 2 shows an output transducer A according to the invention in a diagram close to the actual situation w , which have secondary weights according to ...

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Abstract

A surface-wave transversal filter with an input- and an output-converter (Aw) is suggested, in which the input-converter has a primary-weighting determining the transfer-function and in which the output-converter is provided with a small secondary-weighting so as to improve the falling-characteristics.

Description

technical field [0001] The subject of the invention is a surface wave transversal filter, in particular for use as an intermediate-frequency filter or as a frequency-accurate transmission filter in entertainment electronics. Background technique [0002] Surface wave transversal filters, also known as SAW transversal filters or simply referred to below as transversal filters, are disclosed, for example, in "SAW Components, Data Book 1996" of Siemens Matsushita Components, and in the chapter "General technical information" of this book at 27 and Described on the following pages. The transversal filter is built on a crystal piezoelectric substrate and has two interdigital transducers that also serve as input or output transducers. The input transducer, on which a signal to be filtered is applied, has a weight, by means of which a transfer function is formed. In contrast to this, the output transducer is short and unweighted relative to the input transducer, also having the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/145H03H9/64
CPCH03H9/6426H03H9/1452H03H9/145
Inventor M·舍米斯
Owner 快速追踪有限公司