The piezoelectric filter

 

(57) Abstract:

The invention relates to electronics and can be used for frequency selection signals. The filter contains piezoresonator (cont'd) (1-4) series-connected capacitors (K) (6-10), inductor (S) (5, 11) and secondary (12-14). KI (11) and (6) are connected in parallel between the common bus and the connection point To (12) and PR (1), KEY (11) and (10) are connected in parallel between the common bus and the connection point PR (4) and (13). (7, 8, 9) connected between the common bus and the relevant conclusions PR (2, 3). (14) connected between the first output PR (2) and the second output PR (3). Included additionally connected in series between the common bus and TO (14) KI (15), (16) and KEY (17) TO (18). The technical result is an improvement of the selectivity filter. 1 C.p. f-crystals, 3 ill.

The invention relates to electronics and can be used for frequency selection signals.

Famous strip piezoelectric filter [1], containing the first, second, third and fourth piezoresonator series-connected with the first output of the first piezoresonator connected in series with one of the conclusions of the first inductor and the first capacitor to the third point of piezoresonator connected to the third capacitor, to the connection point of the third and fourth piezoresonator connected to the fourth capacitor, the second terminal of the fourth of piezoresonator connected to the fifth capacitor and the first output of the second inductor, the second the findings of the first, second, third, fourth and fifth capacitors connected to a common bus, which allows to realize high-quality decay.

This device is the closest to the technical nature of the claimed and selected as a prototype.

However, with the strict requirements of the Squareness of the filter device does not provide the required accuracy of adjustment of attenuation poles at frequencies above the bandwidth.

The purpose of the invention is the improvement of the selectivity filter and at the same time simplifying its configuration in the production process.

This goal is achieved by the fact that in the scheme we have introduced the sixth, seventh and eighth capacitors, and a sixth capacitor connected between the input potential terminal of the filter and the first output of the first piezoresonator, the seventh capacitor connected between the output potential terminal of the filter and the second output catercornered, second, the conclusions of the first and second inductors connected to a common bus, as well as the fact that in some cases, the scheme introduces a third inductor having an inductive communication with the first inductor, the first output of which is connected to a shared bus, and the second through the ninth capacitor connected to the second output of the first piezoresonator, and the fourth inductor having an inductive communication with the second inductor, the first output of the fourth inductor is connected to a shared bus, and the second output through the tenth capacitor is connected to the first output of the fourth of piezoresonator.

Comparative analysis shows that the proposed solution differs from the prototype in that scheme introduced advanced sixth, seventh and eighth capacitors, and a sixth capacitor connected between the input potential terminal of the filter and the first output of the first piezoresonator, the seventh capacitor connected between the output potential terminal of the filter and the second output of the fourth of piezoresonator, the eighth capacitor connected between the second output of the first and the first output of the fourth of piezoresonator, main conclusions of the first and second coils inductrack known technical solutions in science and technology is not detected solution having similar characteristics.

In Fig.1 shows the electric diagram of the device. The device consists of a first, second, third and fourth piezoresonator 1-4, connected in series, with the output of the first piezoresonator 1 is connected with one of the conclusions of the first inductor 5 and the first capacitor 6, the connection point of the first and second piezoresonator connected to the second capacitor 7 to the connection point of the second and third piezoresonator connected to the third capacitor 8 to the connection point of the third and fourth piezoresonator connected to the fourth capacitor 9, the second terminal of the fourth of piezoresonator connected to the fifth capacitor 10 and the second inductor 11, the second the findings of the first, second, third, fourth and fifth capacitors, and second findings of the first and second inductors connected to a common bus. In addition, between the input potential terminal of the filter and the first output of the first piezoresonator included the sixth capacitor 12, a seventh capacitor 13 connected between the output potential terminal of the filter and the second output of the fourth of piezoresonator, the eighth capacitor 14 connected between the second output of the first tives such as schema, shown in Fig. 1, the fact that it contains an additional third inductor 15, inductively associated with the first inductor. The first conclusion it is connected with a common bus, and the second output through a ninth capacitor 16 is connected to the second output of the first piezoresonator, and the fourth inductor 17, with the inductive coupling with the second inductor, the first conclusion it is connected with a common bus, and the second through the tenth capacitor 18 is connected to the first output of the fourth of piezoresonator.

The device operates as follows.

If you think the filter circuit in the form of three cascade connected links, as shown in Fig.3, it can be shown that the first link in conjunction with the third is a symmetrical band-pass filter of the third class, the attenuation and the second characteristic impedance. In this case, the output terminals of the 1st level and the input terminals of the 3rd level of the characteristic impedance is the resistance of the 1st class. The second part of the filter will also fit (with appropriate choice of values) of a symmetric bandpass filter of the first class under the characteristic impedance and the second class p the ski resistance allows to obtain the total response of the filter, corresponding to the fifth class of the attenuation and the second class under the characteristic resistance.

Compared with the scheme, selected as a prototype, the proposed filter has a more high attenuation and characteristic impedance (filter prototype has a 4-th class by attenuation and 1 to the characteristic impedance).

At the same time one of the poles of attenuation of the 2nd link can be implemented below the bandwidth in the schema prototype poles of attenuation defined by the second link (the third and fourth piezoresonator), can be located only above the bandwidth and at the same time close enough to the edge of the bandwidth.

If you need to have additional freely varied within wide limits poles of attenuation (e.g., for better suppression of parasitic passbands) scheme introduced two additional inductance and two capacitor (in accordance with the scheme shown in Fig.2), which form in the first and third parts of the filter parallel channel that allows you to spend on their outputs the subtraction of the voltages at the input of links on both channels, virtually any frequency band zadergivanija proposed device was tested experimentally and helped to implement a number of filters at frequencies 60-130 MHz attenuation in the band of retaining 80 dB and a Squareness ratio 5-6 (for filters with relative bandwidths from 0.02 to 0.06%) and Squareness ratio 3-4 (for filters with a relative bandwidth of 0.1-0.2%).

The source of information.

1. A. C. 1373280, CL N 03 N 9/54, 09.07.86, the Piezoelectric filter. D. C. Ryabokon, C. N. Grinenko, R. D. Korneev, P. T. Sannikov.

1. The piezoelectric filter, containing the first, second, third and fourth piezoresonator series-connected with the first output of the first piezoresonator connected in series with one of the conclusions of the first inductor and the first capacitor to the connection point of the first and second piezoresonator connected to the second capacitor to the connection point of the second and third piezoresonator connected to the third capacitor to the connection point of the third and fourth piezoresonator connected to the fourth capacitor, the second terminal of the fourth of piezoresonator connected to the fifth capacitor and the first output of the second inductor, the second the findings of the first, second, third, fourth and fifth capacitors connected to a common bus, characterized in that the scheme introduced advanced sixth, seventh and eighth capacitors, and a sixth capacitor connected between the input potential terminal of the filter and the first output of the first piezoresonator, the seventh capacitor connected between the output potential terminal and the first output of the fourth of piezoresonator, second, the conclusions of the first and second inductors connected to a common bus.

2. The piezoelectric filter according to p. 1, characterized in that the scheme we have introduced a third inductor having an inductive communication with the first inductor, the first output of which is connected to a shared bus, and the second through the ninth capacitor connected with the second output of the first piezoresonator, and the fourth inductor having an inductive communication with the second inductor, the first output of the fourth inductor is connected to a shared bus, and the second output through the tenth capacitor is connected to the first output of the fourth of piezoresonator.

 

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