SU1241150A1 - Device for converting resistance of two-terminal network to voltage - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the components of the impedance of a grounded two-terminal network. The purpose of the shadow is to expand the frequency range of the device in the direction of high frequencies. The device contains a generator 1, an amplifier 4, an exemplary resistor and a measurable two-port 3. The introduction of a transformer 2 with a transformation ratio of 1, and to ensure a transformation ratio of 1, at higher frequencies both windings of the transformer 2 must be wound bifil It is also possible to have the same number of turns, the use of a buffer amplifier with a unit transmission coefficient as amplifier 2 and the formation of new connections between the elements of the device allows one to achieve this goal. 1 il. (L -ffi

Description

The invention relates to a measurement technique and can be used in the measurement of the constituent impedance of a grounded bifurcate.

The aim of the invention is to extend the frequency range of the device in the direction of high frequencies.

The drawing shows a structural diagram of the proposed device.

The device contains an alternating voltage generator 1, a transformer 2 with a transformation ratio of 1, a measured two-port 3, a buffer amplifier 4 with a unit transfer coefficient, o6pa3itoBb resistor 5, input terminals 6 and 7. devices for connecting a two-pole measured 2-pole, output 8 devices

The two terminals of the primary winding of the transformer 2 are connected respectively to the output of the generator 1 and the output of the amplifier 4. Two terminals of the secondary winding of the transformer 2 are connected respectively to terminal 6 and the input of the amplifier 4, the output 8 of the device and the first terminal of the reference resistor 5, the second terminal of which is connected to the common by bus.

The device works in the following way.

Due to the positive current feedback on the reference resistor 5 (RO), a current generator mode is formed, while the measured two-terminal 3 is in the voltage generator mode.

In this case, the voltage at terminal 6

and., and,.

where and is the signal amplitude

generator 1 and output voltage 8

and and.

R

about z

From (1) and (2) it follows that the measurement of the measured two-field

is defined as

I

Ur

.

Uo

 R.

UD

From (3) it follows that for a fixed value of the output voltage

VNIIPI Order 3483G39 Circulation 728

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241150

generator 1, the resistance of the measured two-terminal 3 functionally depends on the voltage at output 8. The same-named terminals of the primary and 5 secondary windings are equipotential, which leads to the neutralization of the pass-through capacitance of the transformer 2 and, as a result, to the avoidance of the double-pole 3 and an exemplary resistor of resistor 5 with a throughput capacity of transformer 2, which contributes to increasing the upper operating frequency of the device.

 5 To provide a transformation ratio of 1, at higher frequencies, both windings of transformer 2 must be wound bifilternally and have the same number of turns20

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Forms of purchasing

A device for converting a two-pole impedance into a voltage containing an alternating voltage generator, one output of which is connected to a common bus, an exemplary resistor, the first output of which is connected to the amplifier's input, and two input terminals of the device for connecting the measured two-terminal, the first of which Connected to a common bus, characterized in that, with

In order to expand the frequency range of the device in the direction of higher frequencies, a transformer with a coefficient of transformation is introduced equal to 1, and a buffer amplifier with a coefficient of transfer equal to 1 is used as an amplifier, and two terminals of the primary winding of the transformer are connected respectively to the second alternator of the alternator

the voltage and the output of the buffer amplifier, and the two terminals of the transformer secondary winding, respectively, are connected to the second input terminal of the device for connecting the measured two-pole and to the input of the buffer amplifier, which is also connected to the output of the device, the second output of the reference resistor is connected to the common bus.

Subscription

Claims (1)

A device for converting ²⁵ resistance of a two-terminal network to a voltage containing an alternating voltage generator, one output of which is connected to a common bus, a model resistor, the first output of which is connected to an amplifier input, and two input terminals of a device for connecting a measured two-terminal terminal, the first of which is connected to a common bus, distinguishing with me in that, with 35 in order to expand the frequency range of the device’s operation towards higher frequencies, a transformer with a transformation coefficient equal to 1 was introduced, and a buffer amplifier with a transmission coefficient equal to 1 was used as an amplifier, two of which. the output of the primary winding of the transformer are connected respectively to the second output of the alternator 45 'of voltage and the output of the buffer amplifier, and the two terminals of the secondary winding of the transformer are respectively connected to the second input terminal of the device for connecting the measured two-terminal device and to the input of the buffer amplifier, which is also connected to the output of the device, the second output of the reference resistor is connected to a common bus.