SU824352A1 - Device for connecting active elements with loads - Google Patents

Description

The invention relates to radio engineering and can be used in amplifiers and generators for various purposes of the decimeter and centimeter wave ranges made on semiconductor diodes and transistors.

A device for coupling active elements with a load is known, comprising: a three-wire transmission line, which is connected to the electrodes of the active elements of the same name by the input ends of the first and second conductors symmetrically located relative to the third conductor [1] '.

However, the known device has an insufficiently wide range of operating frequencies.

The purpose of the invention is the expansion of operating frequencies. 2

This goal is achieved by the fact that, in a device for communication of active elements with a load containing a three-wire transmission line, which is connected to the electrodes of the active elements with the same ends as the input ends of the first and second * conductors symmetrically relative to the third conductor, the third conductor of the three-wire transmission line in its middle the parts are equipped with an additional outlet for connection with the corresponding electrodes of the active elements, and to the output ends of the First and second conductors ruzka.

In addition, the linear resistance of the third conductor exceeds the linear resistance of the first and second conductors of the three-wire transmission line.

The drawing schematically shows the proposed device.

The device for communicating the active elements with the load comprises a three-wire transmission line 1, a first conductor 2, a second conductor 3, a third conductor 4, active elements 5, an additional tap 6, a load 7.

The device operates as follows.

The resistance possessed by the segment of the three-wire transmission line 1 from the input side for vibrations with even symmetry is equal to the sum of the input resistance of the equivalent two-wire transmission line, plus the active and inductive resistance of the portion of the third conductor 4 located between the beginning of the segment of the three-wire line 1 and additional tap b. The above section of the third conductor 4 performs the functions of a ballast resistor. In addition, the third conductor 4 performs functions leading to the absence of resonant frequencies of the resistance of the device from the input side for vibrations with even symmetry. Indeed, the equivalent line for vibrations with odd symmetry in the proposed device is a lossless line, but the equivalent for oscillations with even symmetry a two-wire transmission line is a loss line, and the input impedance of such a line is e * x-yo '^^ al.' ' where W = 7 (L-jR / m "/ C ')

L, R, C - linear inductance, resistance and capacitance of a two-wire transmission line;

W is the frequency;

1 ’is the reflection coefficient at the end of the two-wire line;

d - and - attenuation coefficient and phase constant of wave propagation;

- the length of the line segment.

If R «u) L, then W has an active character, and cCu p> are independent of frequency. Then, when choosing a suitable length of the segment in, such that 24®> 1, ^W ' ^{, e} · the input impedance is almost active and weakly dependent on the oscillation frequency (starting from a certain low frequency and up to an arbitrarily high frequency). The inductive component of the resistance of the third conductor 4 of the three-wire transmission line 1 is made small by increasing the width of the third conductor 4 (with the same width of the first and second conductors 2,3). In general, the input impedance of the device, when correctly performed, is active and weakly depends on the frequency in the frequency range that is practically unlimited from above. This property makes it possible to suppress spurious oscillations in a wide frequency range. Since potential oscillation sources are connected to both the input and output of the segment of the three-wire transmission line 1, a similar consideration can also be made for the output terminals of the three-wire line 1. The segment of the three-wire transmission line 1 for working vibrations with odd symmetry serves as a matching circuit. For this reason, W cannot be arbitrary, and most often W is very small. Such a small value of Zg _x and W may not be enough to introduce effective losses in the chain of spurious oscillations. When performing the third conductor 4 of the line with an additional tap 6, it becomes possible to modify spurious oscillations introduced into the circuit over a wide range, which leads to the absence of resonant frequencies in an even type of oscillation.

The technical and economic effect of the application of the proposed device for coupling active elements with a load is to suppress spurious oscillations with it in a wide frequency range, and the device also performs the functions of balancing and matching circuits.

Claims (2)

cut three-wire line 1 and additional 1lm branch b. The above portion of the third conductor 4 functions as a ballast resistor. In addition, the third conductor 4 performs functions leading to the absence of resonant resistance frequencies of the device from its input side for oscillations with even symmetry. Indeed, the equivalent line for oscillations with odd symmetry in the proposed device is represented by a lossless line, but equivalent to oscillations with even symmetry, two-pin on the transmission line is a lossy line, and the input resistance of such a line. “-I ± i: i ±“ 8k 1-gyo-alGyo 2lve-where W 7 (L-jR / M)) / C) L, R, C - linear inductance resistance and capacitance of the two-wire transmission line; (d is frequency; G is the reflection coefficient at the end of the two-wire line; d- and P (is the attenuation coefficient and phase constant of wave propagation; 6 is the length of the line segment. If R "., then W has an active character, and does not depend on the frequency. Then, when choosing a suitable length of segment 6, such that ftx, i.e., the input resistance is almost active and weakly dependent on the oscillation frequency (starting from a certain lower frequency and up to an arbitrarily high frequency). The third impedance of the third conductor 4 of the three-wire transmission line 1 is made by increasing the width of the third conductor 4 (with the same width of the first and second conductors 2, 3). In general, the input impedance of the device, when correctly performed, is active and weakly dependent on the frequency in the practically unlimited frequency range. This property allows suppress spurious oscillations in a wide frequency range. Since potential oscillation sources are connected to both the input and the output of a three-wire transmission line segment 1, a similar consideration can also be carried out for one clamps of three-wire lines 1. A three-wire transmission line 1 for operating oscillations with odd symmetry performs the functions of a matching circuit. For this reason, W cannot be arbitrary, and most often V7 is very small. Such a small value of Zg W may not be enough to introduce effective losses in the parasitic oscillation circuit. With the execution of the third conductor 4 line with an additional tap 6, it becomes possible to vary the parasitic oscillations introduced into the circuit within wide limits, which leads to the absence of resonant frequencies on the even type of oscillations. The technical and economic effect from the application of the proposed communication device of active elements with a load consists in suppressing parasitic oscillations with it in a wide frequency range, and the device also performs the functions of balancing and matching circuits. Claims. / 1. A device for the connection of active elements with a load, containing a three-wire transmission line, which is connected to the same electrodes of the active elements by the input ends of the first and second conductors symmetrically relative to the third conductor. the fact that, in order to expand the operating frequency range, the third conductor of the three-wire transmission line in its middle part is provided with an additional tap to connect with the corresponding electrodes of the active elements, and to the output ends of the first and second conductors connected load. 2. The device according to claim 2, about t l and that the linear resistance of the third conductor exceeds the linear resistance of the first and second conductors of the three-backflow transmission line. Sources of information taken into account in the examination 1. Patent СЫА № 4056784, cl. H 03 R 3 / .10, 1976 (prototype). J