Reject active piezoelectric filter

 

The invention relates to electronics and can be used in communications technology and measurement techniques. The technical result consists in the implementation of a large number of bands of rejectee. Reject active piezoelectric filter (f) contains the N piezoelectric resonators (PR) 1, connected in parallel, the first conclusions PR 1 are input f and connected with the first output of the first resistor (R) 2, the second set of findings IR 1 is connected to the first output of the second P 3 and through the third R 4 is connected to the inverting input of the operational amplifier (op-amp) 5, while the second output of the second P 3 is connected to a shared bus, and the output of the OS 5 is the output of the filter. The second terminal of the first P 2 is connected to the first output of R 6 and through the fourth R 7 is connected to the not inverting input of OS 5, while the non-inverting input OS 5 through fifth R 8 is connected with a common bus. When a certain selection of circuit elements at frequencies close to the frequency of the serial resonance of any of the N PR, the signals at the input of the algebraic adder OS 5 will have the same amplitude and phase. Due to the operation of subtraction is formed strip of rejectee. At other frequencies the signals will be out of phase and are likely to increase the differential signal in duet to be used in communications technology and measurement techniques.

The closest to the technical nature of the claimed device is selected as a prototype stopband active piezoelectric filter [1], containing operational amplifier with resistive negative feedback, the output of which is the output of the filter, the first piezoelectric resonator, the first output of which is connected to the first output of the first resistor and an input filter, the second terminal of the first piezoelectric resonator is connected to the first output of the second resistor and the third resistor connected to the inverting input of the operational amplifier, the second output of the second resistor is connected with a common bus, the second terminal of the first resistor is connected to the first output of the second piezoelectric resonator and a fourth resistor connected to the not inverting input of the operational amplifier, the second output of the second piezoelectric resonator connected to a shared bus, and the non-inverting input of the operational amplifier via the fifth resistor is connected to a common bus.

A disadvantage of the known device is that it implements a single strip of rejectee.

The objective of the invention to provide an implementation of a larger number of bands re Adam operational amplifier with resistive negative feedback, the output which is the output of the filter, the first and second piezoelectric resonators, the first output of the first piezoelectric resonator is connected to the first output of the first resistor and an input filter, and the second output of the first piezoelectric resonator is connected to the first output of the second resistor and the third resistor connected to the inverting input of the operational amplifier, the second output of the second resistor is connected with a common bus, the second terminal of the first resistor via the fourth resistor is connected to the not inverting input of the operational amplifier, while the non-inverting input of the operational amplifier via the fifth resistor is connected to a common bus, parallel to the first piezoelectric resonator connected to the second piezoelectric resonator and N-2 additional piezoelectric resonator and the second terminal of the first resistor through the additional resistor connected to the common bus.

Comparative analysis shows that the proposed solution differs from the prototype in that parallel to the first piezoelectric resonator connected to the second piezoelectric resonator and N-2 additional piezoelectric resonations solution meets the criterion of “novelty”. When comparing the proposed technical solution is not only the prototype, but also with other known technical solutions in science and technology not found solutions with similar characteristics.

The drawing shows an electric diagram of the device.

The device contains N piezoelectric resonators 1, connected in parallel, the first conclusions of the piezoelectric resonators are the input of the filter and at the same time connected with the first output of the first resistor 2, the second findings of the piezoelectric resonators is connected to the first output of the second resistor 3 and through the third resistor 4 is connected to the inverting input of the operational amplifier with resistive negative feedback 5, while the second terminal of the second resistor 3 is connected to a shared bus, and the output of the operational amplifier is the output of the filter, the second terminal of the first resistor 2 is connected to the first terminal of the additional resistor 6 and via the fourth resistor 7 is connected to the not inverting input of the operational amplifier, this non-inverting input of the operational amplifier via the fifth resistor 8 is connected with a common bus.

The device operates as follows.

With the input of the filter through the l-shaped circuit, obrazovat algebraic myCitadel, which consists of an operational amplifier with resistive negative feedback 5 and resistors 4, 7, 8. When a certain selection of circuit elements at frequencies close to the frequency of the serial resonance of any of the N piezoelectric resonators, the signals at the input of the algebraic vicites will have the same amplitude and phase. As a result, due to the operation of subtraction is formed strip of rejectee. At other frequencies the signal is out of phase, the result will be a strengthening of the difference signal and produces two bandwidth.

Sources of information

1. Patent No. 1801247, CL N 03 N 9/54 from 1.04.91. “Active piezoelectric notch filter. Yasinska, I. M., Zvyagintsev Century. And.

Claims

Reject active piezoelectric filter containing operational amplifier with resistive negative feedback, the output of which is the output of the filter, the first and second piezoelectric resonators, the first output of the first piezoelectric resonator is connected to the first output of the first resistor and an input filter, and the second output of the first piezoelectric resonator is connected to the first output of the second is Roy conclusion of the second resistor is connected with a common bus, the second terminal of the first resistor via the fourth resistor is connected to the not inverting input of the operational amplifier, while the non-inverting input of the operational amplifier via the fifth resistor is connected to a common bus, wherein, with the aim of increasing the number of lanes rejectee, parallel to the first piezoelectric resonator connected to the second piezoelectric resonator and N-2 additional piezoelectric resonator and the second terminal of the first resistor through the additional resistor connected to the common bus.

 

Same patents:

The invention relates to electronics and used in communications technology and measurement techniques

The invention relates to electrical engineering and can be used for frequency selection signals

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

The invention relates to electronics and can be used as a filter main selection of professional receivers

The invention relates to electronics and can be used as a filter main breeding in professional two-way radio equipment

The invention relates to electronics and can be used as a filter main breeding in professional radio receiving devices, and measurement techniques

The invention relates to electronics and can be used as a filter main selection of professional communications equipment

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

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

The invention relates to electronics and can be used in radio receiving devices, and in measurement technology as a filter with multiple bandwidths

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

The invention relates to electronics and can be used as a filter main selection of professional receivers

The invention relates to radio engineering and electronics and can be used in systems signal processing, for example in systems of diagnostics of machines

The invention relates to electrical engineering, in particular to filters for selecting a permanent part of the periodic voltages

The invention relates to microwave devices and can be used to filter high-frequency oscillations in large power that provides the minimum level of out-of-band radiation transmitting devices for various purposes

Bandpass arc-filter // 2165673
The invention relates to electrical engineering and can be used in selective electronic devices, mainly in the performance of microelectronic

The invention relates to electrical engineering and can be used in communication systems for transmission and reception of signals, control systems and medical equipment interference

Directional filter // 2317634

FIELD: radio engineering, possible use in radiolocation stations working with two multi-frequency generators.

SUBSTANCE: directional filter contains two low-and-high-pass filters, a T-joint and two two-channel commutators. Channels of commutator rotors are coupled with shoulders of T-joint, which amount to λ/4 or λ/2 respectively with consideration of rotor channel lengths, where λ - wave length on shoulders of the T-joint.

EFFECT: ensured transmission of two UHF signals of different frequencies sequentially or simultaneously, and of multi-frequency signals - sequentially to one antenna from two transmitters.

4 dwg

FIELD: radio engineering; adjusting frequency-dependent filters.

SUBSTANCE: proposed regulating device designed to adjust frequency response of filter has time-constant transducer that function to measure state of filter charge and to withdraw measurement results from mentioned time-constant transducer in the form of first voltage; converter used to digitize first voltage and to withdraw second voltage obtained as result of first-voltage conversion by mentioned converter; array of adjusting components; and selector using second voltage for selecting at least one adjusting component out of array of adjusting components; state of circuit charge can be adjusted in proposed device by means of at least one chosen adjusting component; mentioned time-constant transducer of proposed device has in addition change-over controller that functions to control at least one charge switch; closure of the latter switches filter over to state of charge.

EFFECT: reduced admissible differences between measured and desired values of frequency-dependent filter components.

14 cl, 6 dwg

FIELD: physics.

SUBSTANCE: invention refers to tuneable pass-band filters (PBF) of receivers and transmitters. In input and output PBF contains, two serial communications, i.e. inductive (1) and transformer (4), and between PBF resonant circuits transformer coupling communications (10) designed as structural component with windings on one frame. Note that communication windings of non-adjacent resonant circuits are located on both sides relative to winding of centre resonant circuit.

EFFECT: maintenance of constant relative pass-band within whole operating frequency range.

2 dwg

Up!