SU1095102A1 - Device for measuring parameters of four-terminal network u-conductance matrix - Google Patents

Abstract

A DEVICE FOR MEASURING THE PARAMETERS OF THE Y-CONDUCTIVITY MATTER FOR 4 FOUR-METAL, containing a quadrupole holder, a signal generator and an impedance meter, characterized in that, in order to improve the measurement accuracy at ultrahigh frequency, two calibrated variable impedance resistors, a power indicator and four switches are introduced into it, and four switches, four switches, four switches, four switches, and four switches. the first stationary contact of the first switch is connected to the output of the signal generator, the second stationary contact of the first KONwyTaTopa is calibrated through the first The variable variable impedance is connected to the common bus of the device, the moving contact of the first switch is connected to the first fixed contacts of the second and third switches, the second fixed contact of the latter is connected to the second 4 fixed contact of the second switch and moving contact of the fourth switch, the moving contact of the second switch connects to the first terminal the quadrupole holder, the second terminal of which is connected to the moving contact of the third switch, the third and fourth to emmy holder through the second quadrupole calibrated variable impedance connected to a common bus of the device, the first fixed contact of the fourth switch is connected to the input of the power indicator and the second fixed contact - to the input of the meter polnk resistances.

Description

2, A device for measuring the parameters of the matrix Y of the Conductivity of a four-way network pop. 1, characterized by the fact that the calibrated variable impedance

Made in the form of an adjustable pass phase shifter, between the output terminals of which an adjustable resistance is connected.

The invention relates to a measurement technique and can be used to measure the parameters of the conductivity matrix of both passive and active two-port networks, including bipolar and field-effect transistors on microwave,

A device is known for measuring the parameters of the y-conduction matrix of a quadrupole comprising a voltmeter and an ammeter ij.

A disadvantage of this device is the impossibility of measuring currents and voltages at ultrahigh frequencies.

The closest technical solution to the proposed is a device for measuring the parameters of the conduction matrix of the quadrupole, consisting of a quadrupole holder, a signal generator and a full resistance meter 2.

The disadvantage of this device is the large measurement error due to the inability to create high-quality idle or short-circuit conditions due to the influence of inductances of the leads. Thus, the measurement error at a frequency of 60 MHz — the actual conductivity component is t20%, and the measurement error of the reactive component conductivity is 50%. With increasing frequency, measurement errors increase.

The purpose of the invention is to improve the accuracy of measurements at microwave frequencies.

The goal is achieved by the fact that two calibrated variables are introduced into the device for measuring the parameters of the y-conductivity matrix of the quadrupole containing the quadrupole holder, the signal generator and the impedance meter.

complex resistance, power indicator and switch cell; the first stationary contact of the first switch is connected to the output of the signal generator, the second stationary contact of the first switch is connected to the common bus of the device through the first calibrated variable impedance of the first switch, and the first stationary contacts of the second and the third switch, the second fixed contact of the latter is connected to the second fixed contact of the second switch and Vision contact of the fourth switch, the movable contact of the second switch is connected to the first terminal of the quadrupole holder, the second terminal of which is connected to the moving contact of the third switch, the third and fourth terminals of the four-pole holder are connected to the common bus of the device, the first fixed contact of the fourth switch is connected with the input of the power indicator, and the second fixed contact - with the input of the impedance meter.

At the same time, the calibrated variable impedance is implemented in the form of an adjustable pass-through phase shifter, between the output terminals of which an adjustable resistance is connected.

Figure 1 shows the block diagram of the device; Fig. 2 is a schematic diagram of the implementation of a calibrated variable impedance; FIG. 3 shows the dependence of the input conductance of the four-pole network on the load conductance; figure 4 - the dependence of the output conductivity of four-port from the reactive conductivity of the generator. The device consists (1) of a four-pole holder 1, a signal generator 2, an impedance meter 3 and a common bus 4. It includes two calibrated variable impedances 1 and 5 and 6, a power indicator 7 and four switches 8-11, and The first fixed contact 12 of the first switch 8 is connected to the generator 2, the second fixed contact 13 via the first calibrated variable-complex resistance 5 to the common bus 4, and the moving contact 14 to the first fixed contact 15 of the second switch 9 and to the first fixed contact 15 The second contact 16 of the third switch 10, the second fixed contact 17 of the second switch 9 is connected to the second fixed contact 18 of the third switch 10 and the moving contact 19 of the fourth switch 11, the second switch 9 of the second switch 9 is connected to the first terminal 21 of the two terminal, the movable contact 2 of the third switch 10 - with the second terminal 23 of the holder 1 quadrupole, the third 24 and fourth 25 terminals of the holder 1 quadrupole are connected together and through the second calibrated impedance 6 - with the common bus 4, the first a movable contact 26 of the fourth switch 11 is connected to the input power yn cators 7, and its second fixed contact 27 - meter 3 with the input impedance. As a calibrated variable impedance 5 and 6, the impedance between the output terminals of the variable pass phase shifter 28 is used, to the input terminals of which the adjustable resistance 29 is connected. The device is based on the properties of the quadrupole, according to which input Jay and output) 1d (, the conductivity from reactive conductivity, respectively, of the load and the generator are circles (Fig. 3) with radii 024 ". UiV-2Pe: 22 p | -. 2 (Re, 2, j + Re :,) „: JBbrx 2 Re -s coordinates of the centers xo« r «4v2i) (.-.- Зп, 2h), .11. .x ,, () (where S, 22 2-t are the specific parameters of the four-port conduction matrix; Re is the load conductivity component that is active. Solving the system of equations (1-7) allows finding the parameters of the four-port and 22 1 known center coordinates and radii circles (RehP x); 61 J..R aj / PBbix i 1 -o.5 | pi, - (fe, Rev2pB ,, xRe Bxo / Peb, cfi ° ijp 2 fTTgy kea PL - (P8X 22-2POVYH / PBb , xf Secondly, if two terminals of a four-port network are connected together (a three-terminal circuit is connected) and the integrated busbar Z2 is connected between them with a common bus, then elements of the susceptibility matrix of the newly formed three-terminal network in mc equal to 2 V.. 11 Voo + Zo -a Y. 22, 5: vf, Y -JlllEfl il: i Y gc i + z,: - / 22-i2 2 If the total resistance of the common wire Z is chosen so so that the equality Zj-z; fulfills the equality, then the extrusion (14) takes the form Xy-O, and the input conductance of the inner part of the formed quadrupole becomes equal YY-Xl-Xil-v 8X-11 -It If the complex resistance in the common wire Z is chosen so that when equality holds, (f8) then expression (15) takes vi -O, and the output conductivity of the bp formed by a quadrupole becomes equal to y {191 UbiJ (Bz e (12) to (13) g 22 2 and knowing from the experiment -f, 221 ip o ° find the definition YV -VV ay 11 bx 22 7 V - ZY 2 vX 2 OUT substituted the value of which in (1 and (18) , we find the conductivity of the direct and reverse transfer of the fourfold pole. The device works as follows. In the holder 1, the fourpole is measured so that the four terminals of the four-pole network are connected to the terminals 21 and 25 of the holder 1, and the output terminals of the four-pole network are connected to the terminals 23 and 24 of the four-pole holder. In the first switch 8, pins 13 and 14 are connected, in the second switch 9, 15 and 20, in the third switch 10, 22 and 18, in the fourth switch 11, 19 and 2 7. The value of the second calibrated variable impedance ™ is set to zero . The magnitude of the first calibrated variable impedance 5 is set to purely reactive, ReZlj 0, and the output conductance is measured even at the terminals of cells and 24 using a 3 impedance meter. Then, the impedance value of 5 is 3.21 and the output conductivity of the quadrupole is measured again. Then a third arbitrary value of the complex resistance 5 Z j3 Zjj is set and the output conductance of the quadrupole is measured again. By three values of the measured output conductivity of the quadrupole on the complex plane, the circumference of its output conductivity is constructed depending on the reactance of the generator. From the graph (Fig. 4), the coordinates of the center and the output radius of the circumference of the circle y are determined (these values can also be obtained analytically from the measurement results). Then contacts 17 and 20 are connected in the second switch 9, and 22 and 16 are connected in the third switch 10. As a result, the first calibrated variable impedance 5 is connected in parallel with the output of the quadrupole, and the meter 3 of the impedances is connected to the input of the quadrupole. In this mode, given by three different reactive values D ZJ,,. The first calibrated variable complex impedance 5 measures the input conductance of the quadrupole and, based on the measured values on the complex plane, a circle defines the dependence of the input conductance on the four-pole actuator on the variation of the load's reactive conductivity. In the absence of active losses in it, Re 2 0 (Fig. 3). From the graph (Fig. 3), the coordinates of the center ReYex are determined. the radius of the circle f ex. Then the first calibrated variable complex resistance 5. is modified so that it possesses the active conductivity and changes the reactive component of this conductivity, three values of the four-pole input conductance are measured and a circle is defined, which determines the dependence of the input conductivity over the four pole from changes in the reactive conductivity of the generator with a known ReY, active conductivity of the generator (Fig. 3). From this graph, the radius of the circle p is determined. Then, contact 12 and bus 4 are connected in the first switch 8, and con- on the fourth switch 11. cycles 19 and 26. As a result, the signal of generator 2 is applied to the output of a quadrupole, and power indicator 7 is connected to its input. In this mode, the value of the second calibrated variable impedance 6 is changed to b. If the readings of the power indicator 7 are zero, this indicates that the reverse conduction of the newly formed quadrupole is zero (At this value of Zj of complex resistance 6 in the fourth switch 11, contacts 19 and 27 are connected, and then the input conductance is measured by means of the 3 impedance meter quadrupole Y, Then contacts 12 and 14 are connected in the first switch 8, in the second switch 9 - 18 and 22, in the fourth switch 11 - 19 and 26. In this mode, the second calibrated resistance 6 changes to The values of Zj at which the readings of the power indicator 7 are equal to zero, indicating that the conductivity of the direct transmission of the newly formed quadrupole is zero (v 0). If Z is the impedance 6, contacts 19 and 27 are connected in the fourth switch 11 and then measured using the 3 impedance meter, the output conductivity of the newly formed four-pole network .. According to the measurement results of the input Yg and output Ygjji conductivities of the four-pole network, determine the radius of the Pwx Pryh Pc and the coordinates of the centers. , VB of conduction circles, as well as the resistance values of the calibrated loads and b, and using formulas (8-11), (16) and (18), calculate the parameters of the full conductivity matrix of the four-pole network. To create a calibrated variable impedance, an adjustable pass phase shifter 28 is used, the output of which includes adjustable resistance 29. The phase length 28 (where / L, / is the wavelength) of the transmission line from adjustable resistance 29 to output terminals of the phase shifter, the resistance between them depends on the value of R resistance 29 and the electrical length of the phase shifter, in accordance with the known expression p jzptg / Zi.ro Zo + jRt; j (b8 where Zp - wave resistance of the phase shifter. The advantage of such a calibrated variable resistance is the possibility of setting any impedance on the complex plane. The measurement errors of the y-parameters of both standard transmission lines and the active quadrupole do not exceed 5.8%.

FIG. 2

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Claims (2)

DEVICE FOR MEASURING THE FOUR-POLE MATRIX MATRIX PARAMETERS, comprising a four-terminal holder, a signal generator and an impedance meter, characterized in that, in order to increase the accuracy of measurements at ultrahigh frequencies, two calibrated complex resistance variables, an indicator of power and four switches, the first fixed contact of the first switch connected to the output of the signal generator, the second fixed contact of the first switch through the first gauge a variable alternating complex resistance is connected to the common bus of the device, the movable contact of the first switch is connected to the first fixed contacts of the second and third switches, the second fixed contact of the last is connected to the second fixed contact of the second switch and to the moving contact of the fourth switch, the movable contact of the second switch is connected to the first terminal the holder of a four-terminal device, the second terminal of which is connected to the movable contact of the third switch, the third and fourth terminals de through the second calibrated variable complex resistance, they are connected to the device common bus, the first fixed contact of the fourth switch is connected to the input of the power indicator, and the second fixed contact to the input of the impedance meter. Phi .1 2. The device for measuring the parameters of the matrix of the y-conductivity of the four-terminal network according to claim 1, characterized in that the calibrated variable complex resistance is made in the form of an adjustable pass-through phase shifter, between the output terminals of which an adjustable active resistance is connected.