SU1406519A1 - Input resistance active component transducer - Google Patents

Abstract

The invention is intended for use in radio engineering devices for various purposes. The purpose of the invention is to increase the range of measured resistances, the device contains two capacitive dividers 1.5, transformer 2 current, detectors 3,4, block 7 subtraction. In order to increase the range of measured resistances, a current transducer 6, a detector 8, a coincidence circuit 9, a HE 10 circuit, a comparator 11, a differential amplifier 12 are entered into the device. 1 il.

Description

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The invention is intended for use in radio engineering devices for various purposes, in particular for tuning automatic matching devices.

The input component impedance active component serves to indicate deviations of the input impedance active component from the matching device from the impedance of the feeder connecting the input matching device to the output of the power amplifier of the radio transmitter. At the same time, its zero readings correspond to the p & speed of the active component of the input resistance of the matching device and the wave resistance of the feeder. : The aim of the invention is to increase the range of measured resistances.

: The drawing shows the electrical circuit of the proposed sensor of the active component of the input resistance.

The sensor of the active component of the input- | ioro resistance contains the first pulsed divider 1, the first transformer ifiaTop 2 current, the first detector 3, second | Detector 4, second capacitive div 5, second current transformer 6, lock 7 subtraction, third detector 8, coincidence circuit 9, NOT 10 circuit, com II, differential amplifier 12.

I The active input-resistance component sensor operates as follows 4frame.

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When a high-frequency signal appears from the voltage of the first capacitive divider J., it is proportional to His voltage on the feeder, to the voltage Uft, proportional to the Conical current S feeder removed from the first trans-3 (on the armature 2. Received the difference is detected by the first detector 3 and is fed to the first input of block 7.

At the same time, the voltage proportional to the voltage in the feeder is removed from the second capacitive division. T1el 5 is detected by the second detector. p: ohm A and is applied in a phase-phase manner to the second input of unit 7.

In case j is active, the component of resistance of the feeder load is equal to the resistance for which the sensor is calculated (for example, 50 Ohm), for example

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The output of block 7 is zero. The voltage proportional to the current in the feeder is removed from the second transformer 6, detected by the third detector 8 and through the comparator 11 enters the input of the NOT JO circuit, from the output of which the logical zero voltage goes to the first input of the coincidence circuit 9, to the second input of which is supplied From the second detector 4. The voltage of the logical zero from the output of the circuit 9 coincidence is fed to the output device, hence at the output of the differential amplifier J2. - the voltage will be zero, which means that the active component of the load of the feeder is equal to its characteristic impedance.

If the active component of the feeder load is greater than the feeder resistance (for example, idle speed, in which there is no current in the feeder and the voltages on the first and second transformers 2 and 6 are equal to zero, and the voltages on the first and second capacitive dividers J and 5 are maximum and equal, then the voltage at the output of block 7 will be zero. The voltage taken from the second transformer 6 is also zero. Therefore, the output of the NOT JO circuit will have a voltage of logical unit that goes to the first input of the 9 match,the second of which is supplied with voltage from the output of the second detector 4. From the output of circuit 9, the voltage of the logical unit is fed to the inverse of the differential amplifier J2, to another non-inverse input of which a voltage equal to zero is applied from the output of unit 7. The output dif - the fermentation amplifier J2 will have a voltage greater than zero, which indicates that the adtizg component of the load resistance is greater than the feeder resistance.

If the component load resistance is less than the feeder resistance (for example, a short circuit at which the voltage on the feeder is zero and the voltage on the first and second transformers 2 and 6 are equal), then the voltage at the output of unit 7 will be less zero The voltage taken from the second transformer 6, through the third detector 8,

comparator 11 enters the circuit NOT JO. From the output of the NOT 10 circuit, the logical zero voltage is fed to the first input of the 9 coincidence circuit, to the second input of which voltage is supplied from the second detector A. From the output of the 9 coincidence circuit, the logical voltage, zero is fed to the inverse input of the differential amplifier 12 , the second Q input of which receives a negative voltage from the output of block 7, therefore the output is differential; The amplifier 12 will have a voltage less than zero, which means that the load resistance component is less than the feeder resistance.

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Claims (1)

Invention Formula The sensor of the active component - the input resistance, containing a segment of the feeder line, two capacitive the divider, the midpoint of the first capacitive divider through the first current transformer connected in series and the first detector are connected to the first input of the subtractor,. and the middle point of the second capacitive divider is connected via the second detector to the second input of the subtraction unit, which is because in order to increase the range of measured resistances, the second current transformer, the third detector, comparator, circuit NOT, circuit a differential amplifier; a differential amplifier; one output of the second current transformer is grounded; the second input of the coincidence circuit is connected to the output of the second detector; the second input of the differential signal is connected to the output of the unit; no.