RU2706181C1 - Active phase-shifting system - Google Patents

Abstract

FIELD: radio engineering; electronics.

SUBSTANCE: invention relates to radio electronics and can be used as a phase-rotation filter. Active phase-shifting system is made in form of differential-bridge circuit, in which first arm is first multi-element impedor, and second arm is second multi-element impedor, connected by first terminals to potential input terminal, and second to corresponding input of operational amplifier, in which output is connected to output potential terminal, first multi-element impedor is made in the form of connected in series inductance coil and three impedors, each of which contains parallel connected inductance coil and capacitor, second multi-element impedor is made in the form of connected in series capacitor and three impedors, each of which contains connected inductance coil and capacitor.

EFFECT: wider range of equipment in the field of active systems.

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Description

The invention relates to electronics and can be used as a phase-shifting filter.

In electronics, phase-shifting filters are used that do not affect the magnitude of the transmitting current and voltage, i.e. at any frequency, attenuation does not occur. Only the phase changes. Phase-shifting links only perform the required phase-frequency characteristics.

Known active piezoresonant frequency-selective system containing input and output potential terminals, a common bus, an operational amplifier having two inputs and one output connected to the output potential terminal, the first and second two-terminal connected to the first terminals with a potential input terminal, and the second with the corresponding input of the operational amplifier, in which the output is connected to the output potential terminal, while the first and second two-terminal devices are made in the form of piezoelectric resonators.

The known frequency-selective system is an active piezoelectric bandpass filter, can perform the function of a phase-shifting system and provides phase shift only in a narrow passband [1].

This device can be taken as a prototype.

The objective of the invention is the expansion of the arsenal of technical means in the field of active systems.

EFFECT: obtaining an active broadband phase-shifting system, obtaining an all-pass filter.

The technical result is achieved by the fact that an active phase-shifting system containing input and output potential terminals has a common bus, an operational amplifier having two inputs and one output connected to the output potential terminal, the first and second two-terminal devices connected by the first outputs to the potential input terminal, and the second - with the corresponding input of the operational amplifier, in which the output is connected to the output potential terminal, according to the invention, the first multi-element two-terminal device is made in the form of a connection connected in series to an inductor and three two-terminal circuits, each of which contains an inductance coil and a capacitor connected in parallel, the second multi-element two-terminal circuit is made in the form of a capacitor connected in series and three two-terminal circuits, each of which contains an inductance coil and a capacitor connected in parallel.

When comparing the claimed invention not only with the prototype, but also with other technical solutions known in science and technology, no solutions having similar features were found.

In FIG. 1 is a circuit diagram of an active phase shifting system; FIG. 2 shows the original and equivalent differential-bridge circuits of the active phase-shifting system, FIG. Figure 3 shows the distribution of the resonant frequencies of the shoulders of the bridge link of the phase-shifting filter.

The active phase-shifting system (see Fig. 1) contains a common bus 1, an input potential terminal 2, to which the first outputs of the multi-element bipolar 3 and 4 are connected. The second output of the bipolar 3 is connected to the first input 5 of the operational amplifier 6. The second output of the bipolar 4 is connected to the second input 7 of the operational amplifier 6, in which the output is connected to the output potential terminal 8. The multi-element bipolar 3 contains an inductor 9, in which the first output is connected to the input potential terminal 2, and the second is connected n with the first leads of the capacitor 10 and the inductor 11. The second leads of the capacitor 10 and the inductor 11 are connected to the first leads of the capacitor 12 and the inductance 13, the second leads of which are connected to the first leads of the capacitor 14 and the inductance 15. The second leads of the capacitor 14 and the coil inductors 15 are connected to the first input 5 of the operational amplifier 6. The multi-element bipolar 4 contains a capacitor 16, in which the first terminal is connected to the input potential terminal 2, and the second is connected to the first the leads of the capacitor 17 and the inductor 18. The second leads of the capacitor 17 and the inductor 18 are connected to the first leads of the capacitor 19 and the inductance 20, the second leads of which are connected to the first leads of the capacitor 21 and the inductor 22. The second leads of the capacitor 21 and the inductance 22 are connected with the second input 7 of the operational amplifier 6.

Elements 9-22, together with the operational amplifier circuit 6, form a 7th-order phase-shifting system.

In FIG. Figure 2 shows the initial and equivalent differential-bridge circuit of the active system, which plays the role of a phase-shifting link.

In FIG. Figure 3 shows the distribution of the resonant frequencies of the arms of the bridge phase-shifting link.

Between two resonance points of the bridging branch in the phase-shifting link, a phase shift always occurs by the value of n.

Between the external points of the resonances and in the frequency range from zero to F 1, from F 6 to infinity, there is still a phase shift of π.

The proposed device performs the function of a phase circuit, in which the phase is a function of frequency, and the attenuation is frequency independent. Such devices are widely used for the synthesis of delay lines, as correctors for phase distortion of electric filters and communication channels, for the synthesis of filters that are consistent with the signal spectrum and in a number of other cases.

Information sources

1. V.A. Arzhanov, I.M. Yasinsky Electric filters and delay lines. Textbook Allowance. - Omsk, ed. OmSTU, 2000, p. 255, fig. 8.8a.

Claims (1)

An active phase-shifting system containing input and output potential terminals, a common bus, an operational amplifier having two inputs and one output connected to an output potential terminal, the first and second multi-element bipolar connected to the first terminals with a potential input terminal, and the second to the corresponding input operational amplifier, in which the output is connected to the output potential terminal, characterized in that the system is made in the form of a differential-bridge circuit, the first multi-element double the wedge of one arm of the bridge circuit is made up of series-connected inductors and three bipolar, each of which contains an inductance coil and a capacitor connected in parallel, the second multi-element bipolar of the other arm of the bridge circuit contains a capacitor and three bipolar connected in series, each of which contains a parallel inductor and capacitor.

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