SU1578804A1 - Phase inverter - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to increase the linearity of the dependence of the phase shift on the angle of rotation of the average terminals of variable resistors. The phase shifter contains phase splitter 1 at 90 °, wideband transformers (PCS) 2 and 3, variable resistors 4, 5 and 6, converters 7, 8 and 9 negative resistance, containing operational amplifier 10 and resistors 11, 12 and 13. Introduction of converter 9, resistor 6 with resistance R 3 - 0.43R, PCS 3 with transformation ratio N = 2.077 with equal resistance of resistors 11, 12 and 13, converters 7, 8 and 9 and equality of resistance R of resistors 4 and 5 to value R 1 = 1.3R allows to reduce the nonlinearity of the dependence of the phase of the output voltage on the angle of rotation of the average output Single variable resistors up to ± 1 ° with nonlinearity of the output voltage amplitude ± 2% in the range of variation of the mutual phase shift from 0 to 360 °. 1 il.

Description

Fig 1.

The invention relates to a measurement technique and can be used in precision devices for adjusting the phase of a signal.

The purpose of the invention is to increase the linearity of the dependence of the phase shift on the angle of rotation of the average outputs of variable resistors,

Fig. 1 shows the basic electrical circuit of the proposed phase shifter; Fig. 2 and 3 are graphs of the dependence of the phase shift and the amplitudes of the output voltages on the angle of rotation of the average outputs of the variable

ZISTOROVO

The phase shifter contains the phase splitter 1 at 90 °, the first and second wideband transformers 2 and 3, the first, second and third variable resistors 2 4-6, the first, second and third converters 7-9 of negative resistance, each of which contains an operational amplifier 10 and the first, second and third resistors 11-13. 2

Phaser works as follows

A harmonic signal is fed to the input of the phase shifter, which through the third variable resistor 6 from its 3 middle pins, to which is connected the first output of the third negative resistance converter 9, made according to the non-inverting amplifier circuit on the operational amplifier 10 with positive feedback through resistor 11 and resistors 12 and 13, is fed to the input of the phase gap 1 at 90 ° C From the first exit of the phase separator 1 at 90 °, the voltage with a phase shift equal to zero goes to the primary 067 hank of the first broadband trans of the formator 2 and then through its secondary winding to the first and second variable resistors 4 and 5 o C connected to the secondary winding by the extreme leads of the second output of the phase 10–1 chip 90 °, the voltage with a phase shift of 90 ° goes to the primary winding of the second broadband transformer 3 and further from its secondary winding through the first and second converters 7 and 8 of negative resistance, made in a similar way as the third converter 9 of negative resistance, goes to the middle terminals of the But the first and second variable resistors 4 and 5, and the average conclusions of the first, second

RI

R

AT

The third variable resistors are meanically combined on the same axis.

The output voltages of the phase shifter are taken from the middle pins of the first second variable resistors 4 and 5 described by one expression

sp 2eM + jeKl-.QnA U t-ei (1- “0A

.one

1- (1-2cOrot- 0.5-0.5Sign (Q, 5-cO:} B

(D

de oЈ is a coefficient proportional to the angle of rotation of the middle pins of the first, second, and third variable resistors and varying from 0 to 1; n - transformation ratio

the second broadband transformer 3;

a coefficient equal to the ratio of the resistance of the first or second variable resistors 4 and 5 and the resistance of the resistors 11-13 of the first and second converters 7 and 8 of the negative resistance; a coefficient equal to the ratio of the resistance of the third variable resistor 6 and the resistance of the resistors 11-13 of the third converter 9 negative resistance. Expression (1) implies that the output voltage modulus is described by the expression

if cC-O TJZMl-oQ n A 1-oC (1-ct) A

 1- (1-2o0 d, 5-0,5Sign (0,5-cOQ} B

and the phase of the output voltage is described by the expression

/, ot (1-oi) nA lf (et) - arctg. 2o, -1

The nonlinearity of the dependence of the phase of the output voltage on the angle of rotation of the average outputs of the first, second and third variable resistors 4-6 1p (oO is determined by the difference uCf (oO is 180 volts and reaches a minimum value of + 1 ° for a value of pА 2.7 Output voltage module K 1 at about 0 and about Ј 1 o At, 5 and A 2.7 output voltage module K 1 at A 1.3 and coefficient E R

51578804

in the transformation of the second wide-cross-transformer transformer p 2,077,

The non-linearity of the dependence of the output voltage module on the rotation angle of the first, second, and second variable terminals of the resistors K (oL.) Is limited by the difference and K K (oO -1 reaches its minimum value, good j-0.02 at В = 0.43 YU

So the introduction of the third

and the second first terminal is connected to the phase transformers by first phase converters, the corresponding converters connecting the line to the phase line from the angle of the variables p the broadband converter from one to the third; Secondly, the third input is connected mechanically with the middle of the splitter resistor of the third cone-saprotic connection of the subcircuit and secondary terminals to the second by 90 ° and a converter, the first and second are equal to one, the third

converter; negative resistance, third variable resistor with resistance, 43R, second wideband transformer with a transformation ratio, 077, with equal resistance R of the first, second and third resistors 11-13 of the first, second and third converters 7-9 and equality of the resistance of the first and second variable resistors, the value of R {1, 3R, allows to reduce the nonlinearity of the dependence of the phase of the output voltage on the angle of rotation of the average terminals of the variable resistors to +1 while the amplitude of the output April voltage + 2% in the range varying mutual phase shift from 0 to 360 ° "

Claims (1)

Invention Formula A phase shifter containing a 90 ° phase splitter, to the first output of which is connected the first output of the primary winding of the first broadband transformer, the second output of which and the average output of the secondary winding of the first broadband transformer YU five 20 five 0 five The extreme terminals of the first and second variable resistors, the middle terminals of which are mechanically combined on the same axis and are the outputs of the phase shifter, to which the first terminals of the first and second negative resistance converters are connected, respectively, the second terminals of which are interconnected, characterized in that In order to increase the linearity of the dependence of the phase shift on the angle of rotation of the average terminals of variable resistors, a second wideband transformer, a third negative resistance converter and Tille variable resistors, per- vy; the second outputs and the third branch of which are interconnected and are the input of the phase shifter, and the middle terminal of the third variable resistor is mechanically connected on the same axis with the middle terminal of the first variable resistor and connected to the phase splitter input by 90 ° and to the first terminal of the third negative resistance converter The second terminal of which is connected to the busbar, to which the first terminals of the primary and secondary windings of the second broadband transformer are connected, the second terminals of which are connected respectively but to the second output of the phase coupler by 90 ° and to the second output of the first negative resistance converter, the resistance value of the first and second variable resistors being 1.3 R, and the resistance value of the third variable resistor pa connected to a common bus, parallel -.- equal to 0.43 R, where R is the value of co „ but the secondary winding of the first broadband transformer is connected resistive resistance converter resistors resistive resistance converter resistors FIG. 2 Fig.z