RU1627045C - Converter of surface acoustical waves - Google Patents

Abstract

The invention relates to electronics and can be used in signal processing devices. The purpose of the invention is to increase the accuracy of reproducing a given amplitude-frequency characteristic. The transducer of surface acoustic waves (SAWs) contains a piezoelectric vukopropod, on the working field of which there are first and second electrodes of different types, summing type 3 and contact area. 4. resistive 5 and capacitive G elements of DIRT, potential 7 and common To the terminals. Moreover, the electrodes 1 of the first group are combined by a summing bus 3, and the electrodes 2 of the second electrode group are connected between oh reeistiv- GOVERNMENTAL 5 and 6 CHPRMRITYAMI capacitive communication. The electrode group 2 is partitioned, with one or several electrodes 2 of the second electrode group of each section being connected through the resistive-capacitive elements 5.6 of the connection to the contact pad i). 1 ill. (L C

Description

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The invention relates to radio electronics and can be used in a signal processing device for surface acoustic waves (SAWs).

The aim of the invention is to increase the accuracy of the reproduction of a given amplitude-frequency characteristic (AFC).

The drawing shows the proposed Converter surfactant.

It contains a piezoelectric sound duct (not shown conditionally), the first 1 and second 2 heteropolar groups of the electrodes summing the bus 3 v (pad 4, resistive 5 and capacitive 6 communication elements, potential 7 and common 8 terminals.

The surfactant converter operates as follows,

When an electrical signal is applied to the potential 7 and common 8 terminals and, respectively, to the summing bus 3 and the contact pad 4 galvanically connected to them, a potential difference arises between the reenopolar electrodes 1, 2 and, corresponding to the electric signal. The voltage between the electrodes is 1. 2 and, therefore, the charge on each of them depends on the values of the electrical connections through the resistive 5 and capacitive 6 elements, as well as on the resistive and capacitive connections of one electrode of each section of the second group of elements with a contact pad 4 through communication elements 5, 6.

As a result, a surfactant, which is a superposition of a surfactant, is excited in a piezoelectric sound guide (not shown). radiated by all periods of bipolar elements 1,2. The magnitude of the surfactant emitted by each individual period of the converter depends on the overlap of the electrodes 1.2, as well as on the resistance values of the resistive coupling elements 5 and the capacitance values of the capacitive coupling elements 6. Thus, in the converter, the excitation intensity of the surfactant in

compliance with a given amplitude-frequency characteristic (AFC).

Claims (1)

Making the transducer sectioned and connecting each section of the second group of electrodes 2 through re-resistive-capacitive elements 5. 6 communication with the pad 4 and the potential terminal allows you to implement a wider range of weights, reduce the static capacitance of the transducer by dividing the voltages at each the period of the converter is not relative to the entire voltage of the signal source, as in the prototype device, but relative to the voltage amplitude on the previous period of the converter, which allows It only requires very small weights in the corresponding parts of the converter by slightly changing the values of the resistive 5 and capacitive 6 coupling elements. d Thus, in the proposed Converter provides the achievement of the goal - improving the accuracy of reproduction of a given frequency response. The claims A surface acoustic wave (SAW) transducer containing a piezoelectric sound duct, on the working surface of which are placed the first and second groups of heteropolar electrodes, the electrodes of the first group are combined by a summing bus connected to a common bus, and the electrodes of the second group are connected by resistive coupling elements, contact a platform connected to a potential terminal. It differs in that, in order to increase the accuracy of reproducing a given amplitude-frequency characteristic, the second group the electrodes are partitioned in this case one or more electroshot of the second group of each section are connected through resistive-capacitive coupling elements to the contact pad, and the electrodes of the second group in each section are additionally connected to each other by capacitive coupling elements.