SU987802A2 - Phase-shifting device - Google Patents

Description

(5) PHASE SHIPPING DEVICE

This invention relates to radio engineering and can be used on various receiving devices.

According to the main author. St. No. a phase shifter is known, containing a phase shifter, three mixers, four (1) Iltra and a generator, the output of the first mixer through the first (| sylter and second mixer connected to the second (1 filter and the third (|) ilter and third mixer, connected to the fourth (filter, and the generator output is connected directly to the second inputs of the second and third mixer and through the phase shifter to the second input of the first mixer C O.

However, the known device does not ensure the accuracy of the formation of the phase difference of the output signals.

The purpose of the invention is to improve the accuracy (1, adjusting the phase difference of the output signals.

The goal is achieved by THAT phase-shifting device containing a phase shifter, three mixers, four (|) iltra and a generator, with the output of the first mixer through the first (SML and the second mixer connected to the second filter and through the third ({ml and the third mixer is connected to the fourth 5 and the generator output is connected directly to the second inputs of the second and third mixer and, through a phase breaker, to the second, the input of the first mixer, between the output of the second and fourth filters and the control input of the phase shifter An additional phase shifter and a phase chip are connected in series.

In addition, between the outputs of the additional phase shifter and the inputs. phase detector introduced a phase difference multiplier. The drawing shows a block diagram of the proposed device. The device contains mixers 13, t-y filters, phase shifter 8, generator 9, additional phase shifter 10, phase detector 11, phase difference multiplier 12. The device works as follows. Filter i is tuned to the total combinational frequency of the conversion products and is connected between mixer 1 and mixer 2, the filter is tuned to the differential combinational frequency and switched on between mixers 1 and 3, filters 6 and 7 are tuned to combinational frequencies equal to the frequency of the mixer input signal and on the outputs, respectively, of mixers 2 and 3, the generator 9 is connected to the second INPUT of the mixer 1 through the phase shifter 8 and to the second inputs of the mixers 2 and 3 directly. The mode of operation of the phase shifting device is chosen such that the voltage level of the generator 9 at the mixers is constant and the input signal of the mixer 1 does not exceed a predetermined value, which ensures the linear operation mode of the mixers and, therefore, high accuracy of the formation of the output signal parameters. The first input of the mixer 1 receives a harmonic input signal (signal source not shown). As a result of the linear conversion, the generator 9 on the output of mixer 1 receives signals from the combined frequencies with the same amplitudes. Using filters and 5, we ensure their frequency separation, filter A extracts the signal of the sum frequency --UUrCoC () + - -4r3, (1) and filter 5 - the signal of the difference combinational frequency U, j UUpCOsE {a; - " r t + 4-4 - p,. (2) where and, the amplitude, frequency and initial phase of the input signal of mixer 1; Uj, a | -, j.- amplitude, frequency, and initial phase of the generator voltage 9; M is the phase shift introduced by the phase shifter 8. The main features of the output signals (1) and (2) are equal to 9 amplitudes, as well as automatically maintaining equality of amplitudes, synchronous and proportional to their changes with changes in the input signal level. Due to these valuable properties, the output signals (1) and (2) can be used to identify the characteristics of quadrupoles operating at different frequencies ah. Adjusting the frequency of the output signals provide a change in the frequency of O. The signal (1) and (2) also arrive at the first inputs, respectively, of mixers 2 and 3, in which they undergo a linear transformation. As a result, the outputs of the mixers receive signals of combinational frequencies. Moreover, the frequency of one component in each of the two cases is equal to the frequency of the input signal. Filters 6 and 7 are tuned to combinational frequency signals equal to the input signal frequency and are separated. Therefore, at the outputs of filters 6 and 7, there are signals that can be represented respectively by the expressions and and .ttit + H, u and ("; 1 FCh -h- ;. () Signals (3) and (A) have the following The amplitudes are directly proportional to the amplitude of the input signal, are equal to each other and do not depend on phase shifts, the frequency is equal to the frequency of the input signal, the arguments do not depend on the initial phase of the generator voltage 9, but completely contain the initial phase of the input signal i.e., when 0, they are in phase with the input signal, which allows the initial phase of the sig (3) and (4). by changing the initial phase of the input signal; start the phases of the signals (3) and (k with respect to the initial phase of the output signal change by the same amount, given by the phase shifter 8, but the signs of this change are opposite, i.e. the arrangement of the output sigals is a mirror-symmetrical relative to the input signal, the phase difference is 2, which weakens the requirements for the maximum value of the phase shift introduced by the phase shifter 8. The output signals (3) and (k) are fed to the inputs of the additional phase rotator 10, with the help of which set the phase difference (phase shift) f and transfer it to the passing signals, which are fed to the phase detector 11, which converts the specified phase difference to a DC voltage proportional to the cosine "/, This voltage goes from the phase detector 11 to the control input of the phase shifter 8. The latter, under the action of a constant voltage, changes its state until the phase difference between the signals (3) and () is equal to the specified value fa and opposite in sign. This installation of differences, phases corresponds to the zero sign of the output voltage of the phase detector11. - As an additional phase shifter, a two-phase generator is used, and the phase shift set by it is transferred to the main frequency by means of two additional mixers, the second inputs of which are connected to the corresponding outputs with 25 dami

a two-phase generator, ne {5th inputs are the inputs of an additional phase shifter 10, and the outputs are outputs of an additional phase shifter 10. The technique of forming phase shifts is most developed and provides the highest accuracy in the low frequency range. Therefore, frequency conversion is used to match the low frequency with the frequency of the signals (3) and C), and phase-insensitive amplifiers are used to establish the specified amplitudes in the additional phase shifter.

An additional phase shifter and a phase detector are introduced in series and a control input of the phase shifter.

2. The device according to claim 1, .o tl and haham, that between the outputs of the additional phase shifter and the inputs of the phase detector a phase difference multiplier is introduced;

Information sources, . taken into account in the examination

1. USSR author's certificate “6575, cl. H 02 M 1/06, H 02 R 13/16, 1976 (prototype). 2 The use in the proposed device of an additional phase shifter 10 and phase detector 11 with the corresponding 1 connections improves the accuracy and automation of setting the phase difference, as well as its transfer to output signals (3) and (k). To increase the resolution of 1E (this capacity and further improve the accuracy of forcing the phase difference between the signals (3) and ()) is not (k / additional phase shifter 10 and phase detector 11, phase difference 12 is included in the home source 12. The sensitivity increases by a factor of multiplying the phase difference times. Formula of the invention 1. Phase-shifting device according to the author St. No. BZ, of tl and h and Yuni accuracy of forming the phase difference of the output signals, the second and the fourth filter: d

Claims (2)

Claim 1. Phase shifting device according to ed. St. To 657541, it is torn with the fact that, in order to increase the accuracy of forming the phase difference of the output signals, between the outputs of the second and fourth filters and the control input of the phase shifter, an additional phase shifter and a phase detector are connected in series. 2. The device according to Claim. phase difference multiplier introduced; .