SU1758855A1 - Phase shifter - Google Patents

Abstract

Phase-shifting device can be used in processing systems and the formation of pulse signals. The device comprises an input bus 1, an output bus 2, keys 3, 4, a comparator 6, a saw-tooth generator 7. The introduction of an inverter 11, a sawtooth generator 8, a comparator 9. BENCHE element 13, an AND 14 element, an OR 12 element, a peak detector 17 and a voltage divider 15 allows, when expanding the frequency range of the input signals, to provide a constant phase shift meander. 2 Il.

Description

The invention relates to a pulse technique and is intended for the phase shift of a rectangular input pulse signal.

A phase shifting device is known, which contains an input bus, an output bus, two keys, whose outputs are connected to a common bus, the input of the first key is connected to the first input of the first comparator and the output of the first sawtooth voltage generator, the input of the second switch is connected to the output of the second sawtooth voltage generator ( see A.P. № 1205288. CL H 03 K 7/04, H 03 H 7/18, 1984).

The aim of the invention is to expand the frequency range of the input signals.

This goal is achieved by the fact that in a phase shifter containing an input bus, an output bus, two keys whose outputs are connected to a common bus, the input of the first key is connected to the first input of the first comparator and the output of the first sawtooth generator with the output of the second sawtooth generator, a second comparator, a phase shift control bus, an inverter, an OR element, a BAN and an I element are introduced, and the input bus is connected to the first input of the OR element, with the input of the sawtooth generator and through the inverter with the input of the second sawtooth generator, the output of which is connected to the first input of the second comparator, the second input of which is connected to the second input of the first comparator, and the outputs of the comparator are respectively connected to the inputs of the BANNER element whose output is connected to the first input of the AND element, the output of which is connected to the output bus and the second input of the OR element, and the second input to the output of the OR element and control inputs keys that are used normally closed.

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In order to ensure the independence of the phase shift or the frequency at the square wave signal, a peak detector and a controlled divider are added, the input of which through the detector is connected to the output of the first sawtooth generator, and the output to the phase shift control bus.

FIG. 1 shows a functional diagram of the device; in fig. 2 - time diagrams of his work; in fig. 3 shows an embodiment of an electronic normally closed key.

The device contains an input bus 1, an output bus 2, keys 3 and 4, the outputs of which are connected to the common bus 5, the input of the first key 3 is connected to the first input of the first comparator b and the output of the first generator 7, the input of the key 4 is connected to the output of the second generator 8 sawtooth voltage, second comparator 9, phase shift control bus 10, inverter 11, element OR 12, element 13 BAN, element 14, the input bus 1 connected to the first input of element OR 12, to the input of the generator 7 sawtooth voltage and through an inverter 11 - with generator input 8 a sawtooth voltage, the output of which is connected to the first input of the comparator 9, the second input of which is connected to the phase shift control bus 10 and to the second input of the comparator 6, the outputs of the comparators 6 and 9, respectively, are SONDINRARY with the inputs of the Inhibit element 13 whose output is connected to the first input of the element And 14, the output of which is connected to the output bus 2 and to the second input of the element AND PI 12, and the second input to the output of the element OR 12 and the control inputs of the keys 3 and 4.

Bus 10 is connected to the output of a controlled voltage divider 15, generally controlled by bus 16, the input of which through the peak detector 17 is connected to the output of a sawtooth generator 7.

FIG. 3 shows that switches 3 and 4 can be performed on field-effect transistors 18 and 19.

Phase-shifting device operates as follows.

In the absence of input signals on bus 1, the keys 3 and 4 are closed, the capacitors of the generators 7 and 8 of the sawtooth voltage are completely discharged through the keys 3 and 4, the potentials of the comparators 6 and 9 are high, the element 13 is inhibited, the outputs of the element And 14, the output bus 2, the element OR 12 oeno zero. On bus 10, there is some positive voltage Uy corresponding to the required phase shift of the input pulse, which will come to bus 1.

After the arrival of the leading edge of the input pulse UBX on bus 1 (see time point c), a high voltage from the output of the element OR 12 is formed, as a result of which the capacitors 3 and 4 open, the output voltage of the inverter 11 becomes zero, therefore the voltage from the output sawtooth generator 8 remains zero. The voltage from the output of the sawtooth generator 7, from time ti, gradually increases. At time t2, the value of 5 on the voltage from the output of the generator 6 of the sawtooth voltage exceeded the voltage Uy applied to the bus 10, the voltage from the output of the comparator 6 and the input of the prohibition of element 13 The prohibition became 0 and zero from the output of element 13 The prohibition of the element And 14 and on the output bus 2 formed the leading edge of the output pulse UBUX. The time between the moments of time from ti to 12 is zero of the shift of the output-5 pulse.

A UBX impulse can be arbitrarily long.

At the moment of time Tz, the back edge of the input pulse UBx has been formed, the voltage rise from the output of the sawtooth generator 7 has stopped, a high voltage is generated from the output of the inverter 11, and the voltage from the output of the generator 5 begins to increase linearly. torus 8 sawtooth

At time t4, the voltage from the output of the generator 8 of the sawtooth voltage exceeded the voltage on bus 10 and the voltage at the output of the comparator 0, at the output of the element Ban 13, at the output of the element I 14, at the output bus 2, at the output the element OR 12 becomes zero. The trailing edge of the 11V output pulse was formed, the keys 3 and 4 closed, and through them the capacitors of the saw-tooth generators 7 and 8 were discharged to zero. The phase shifter has returned to its original state. Further work is similar to the considered. 0 If the voltage rise from the generators 7 and 8 of the sawtooth voltage is equal, the time from the time ti and t2 and the time from t4 to ta are strictly equal to each other and this ensures equality of the duration 5 of the output pulse Lt and the duration of the input pulse UBx, but the phase of the output the impulse is shifted by a given angle, determined by the voltage applied to the bus 10. An additional advantage of the proposed Phasi-biasing device is that the impulse supplied to the bus 1. can be of any duration, and at the same time Sawtooth generators 7 and 8 should only be equal to the maximum phase angle, regardless of the duration of the input pulse.

In those cases when the UBx pulses are variable in frequency and a constant phase shift is required, independent of the frequency of the input pulses, a peak detector 17 and a controlled voltage divider 16 are used.

In this case, the input pulses must be of type square wave. The output voltage from the peak detector is proved inversely proportional to the frequency of the input pulses, and as a result, the voltage on the control bus, i.e. if, for example, the frequency of the input pulses has doubled, then the output voltage on the Yuumechiits bus is doubled, i.e. at a shorter time, the comparators 6 and 9 will operate, and the phase shift angle relative to the input frequency will tend to remain constant.

Claims (3)

Claim 1. Phase-shifting device containing input bus, output bus, two keys, outputs of which are connected to common bus, input of the first key is connected to the first input of the first comparator and output of the first saw-tooth generator, second input Sawtooth generator, characterized in that. in order to expand the frequency range of the input signals, a second comparator, a phase shift control bus, an inverter, an OR element, a Ban element and an AND element are entered into it, the input bus connected to the first input of the OR element. with the input of the first sawtooth generator and via the inverter with the input of the second sawtooth generator, the output of which is connected to the first input of the second comparator, the second input of which is connected to the second input of the first comparator and the phase shift control bus, and the output to the first input of the element The prohibition, the second input of which is connected to the output of the first comparator, and the output to the first input of the AND element, the output of which is connected to the output bus and the second input of the OR element, and the second input to the output of the OR element and control inputs of keys that are normally closed. 2. The device pop. 1, characterized by the fact that. In order to ensure the independence of the phase shift from the frequency of the input pulses at a signal of the square wave type, a peak detector and voltage divider are inputted into it, the input of which is connected to the output of the first sawtooth voltage generator through the peak detector and the output to the phase shift control bus. 3. The device according to claim 2, characterized in that, in order to ensure a smooth adjustment of the phase shift, the voltage divider has an electronic control. % ig FIG. 2