SU894599A1 - Phase shifter - Google Patents

Description

(54) PHASE EXPANDER

I

The invention relates to a measurement technique and can be used for phase calibrators or, two-phase square voltage generators.

A known frequency multiplier with combinational logic, which operates on the principle of phase rotation, consisting of two waiting multivibrators, an integrating chain, a voltage-to-current converter, a sawtooth voltage generator, a divider, a voltage, and a comparator P.

The disadvantages of this phase shifters are the need to ensure high linearity of voltage-to-current conversion in a wide range of input frequencies, as well as the accuracy of the comparator response. .

The closest in technical essence to the present invention is a phase shifter comprising a sawtooth generator, a controlled voltage divider, a comparator and a trigger, the device inputs being connected to the inputs of the saw voltage generator and voltage divider, the outputs of which are connected to the comparator inputs the output of which is connected to the input of trigger 2.

The disadvantage of this phase shifter is that the accuracy

ten . The phase shift depends on the temperature stability of the sawtooth generator and on the stability of the comparator threshold.

15

The purpose of the invention is to increase the accuracy of setting the phase shift.

Claims (2)

The goal is achieved by the fact that the phase shifter containing a voltage divider, a sawtooth image generator 20. voltage, the input of which is connected to the input of the device, and the output to one of the inputs of the comparator, the output of which is connected to the C input of the trigger, is entered by three integrators and an element AND, the input of the first integrator is connected to the input of the device, and the output the output of which is connected to the summing input of the second integrator, the output of which is connected to the second input of the comparator, the D input of the trigger is connected to the input of the device and to one of the inputs of the element I, the second input of which is connected to the inverse output t iggera and the trick input of the third integrator, the output of which is connected to a subtractor WMOs row of the second integrator, the output-OPERATION Arrange connected to the forward output trig ger. The drawing shows the functional diagram of the phase shifter. The phase shifter consists of integrator 1, voltage divider 2, integrator 3, sawtooth generator 4, comparator 5, trigger 6, element 7 and integrator 8. The phase shifter works as follows. A unitary square voltage of a square wave type is applied to the input of the device. This voltage is integrated by the integrator 1 and through the divider 2 the voltage is applied to the summing input of the integrator 3 o, ib, where and t is the amplitude of the input signal; u is the pulse duration; T is the period of input voltage; k is the division factor of the divider. The sawtooth generator 4 forms a two-pole for each half-period of the input voltage. A voltage that supplies from the input of the comparator 5, to the second input of which the output voltage of the integrator 3 is applied. The output of the comparator 3 is connected to the C input of trigger 6, to the D input of which input voltage is applied. From the direct output of the trigger 6, the output voltage is removed with the specified phase shift, and the inverse output is connected to the element 7. At the output of the element 7, a pulse is generated, the duration of which in the established mode is equal to the phase shift specified by the divider 2 voltage sAl The output from the output of the AND 7 is integrated by the integrator 8 and fed to the subtracting input of the integrator 3. and i-Negative feedback aligns the voltage at the inputs of the integrator 3 and + - and r.K T Therefore, the proposed device can work out any phase shift specified by the coefficient K within the duration of the input pulse t. At the input voltage of the type meander, i.e. when-pr-0.5, the phase shift of the LCh 180 is possible. The accuracy of setting the phase shift in the proposed phase shifter is not affected by the linearity and stability of the sawtooth voltage and the accuracy of the comparator. The device allows automatic control of the phase shift setting, and the frequency range is limited only by the speed of the comparator. Claims of invention; the inverter comprising a voltage divider, a sawtooth generator, the input of which is connected to the input of the device, and the output with one of the inputs of the comparator, whose input is connected to the C input of the trigger, the direct output of which is connected to the output of the device characterized in that, in order to increase the accuracy of setting the phase shift, it is equipped with three integrators and an element, and the device input is connected to the D input of a trigger, with one of the inputs of the element And, and with the input of the first integrator, whose output is Without a voltage divider connected to the summing input of the second, igo integrator connected to the second input of the comparator with its output, the inverse output of the trigger is connected to the second input of the element I, the output of which is connected to the subtracting input of the second integrator through the third integrator. .Sources of information taken into account in the examination 1. Electronics, 1978, K 6, p. 67. 2. Electronics, 1976, No. 21, p.59. C T)