SU1453480A1 - Attenuator - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase speed. The attenuator contains segments 1, 2 and 3 of the transmission line, control voltage source 4, two-pole switch 5, power sources 6 and 7, pin diodes 8 and 9, semiconductor diode 10, capacitors 12 and 13, accelerating circuit, from potentiometer 14 and capacitor 11, inductance 15 and 16, power supply filters 17 and capacitive stubs 18. By unlocking pin diodes 9 at the moment of supplying a control pulse, a high attenuation rate is introduced when locking the attenuator. 1 cl.

Description

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This invention relates to radio engineering and can be used in radio transmitters and radio receivers.

The purpose of the invention is to increase speed.

The drawing depicts a flax principle attenuator circuit.

The attenuator contains the first, second and third sections 1-3 of the junction line, the source 4 of the control voltage, the double-pole switch 5, the first and second sources 6 and 7 of the power supply, the first and second pin diodes 8 and 9, the semiconductor diode 10 The first, second and third capacitors 11-13, the accelerating circuit, which is made. in the form of a parallel connection of the potentiometer 14 and the first capacitor 11, the first and second inductances 15 and 16, the power supply filters 17, the capacitive stubs 18.

The first source 6 is filled with positive polarity, and the second source 7 is negative, the first source 6 is connected to the control input of the two-key switch 5, the third segments 3 are identical with a length equal to a quarter of the wavelength, one of their ends is short-circuited.

The device works as follows.

In the absence of a control pulse from source 4, a bipolar switch 5 connects an accelerating kntsuk chain to the second source 7. The first pin diodes 8 are open, the first capacitor 11 accumulates charge, the second pin dyrds 9 are closed and do not shunt the first segment 1 Low resistance. The first p1p diodes 8 are transformed through the second segments 2, the length of which is chosen close to a quarter of the wavelength, into a large resistance and also do not shunt the first segment 1. The attenuator introduces a small attenuation.

When a control pulse is applied from source 4, a two-pole switch 5 connects the accelerating circuit to the first source 6. A voltage equal to the sum of the voltage of the first source 6 and the voltage on the first capacitor 11 is applied to the first pin-diodes 8 this voltage, the passage through the second capacitors 12, creates a trigger bias on the second

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pin diodes 9, which openly shunt segment 1. The inductance of the second pin diodes 9 is compensated for by the capacity of the third capacitor 13. The voltage applied to the first pin diode 8 ,. leads to the absorption of the charge accumulated in their bases. After locking the first pin diodes 8, further discharge of the first capacitor 11 occurs through a chain of series-connected semiconductor diode 10 and first inductance 15. The large resistance of the locked first pin diodes 8 is transformed by the second segments 2 to the first segment 1, providing a mode close to clamping. . The minimum value of the resistance transformed to the first segment 1 is both baked by selecting the length of the capacitive stubs 18. After the charge time of the second capacitors 12 has expired, the voltage applied to the second pin diodes 9 decreases to zero until the next accelerator circuit is connected to the first one source 6 they remain closed. The self-induction EMF 16 arising in the second inductance accelerates the dissipation of the accumulated charge in the second pin diodes 9. Unlocking the second pin diodes 9 at the moment of supplying the control pulse provides a high rate of attenuation when the attenuator is locked.

Claims (1)

At the end of the control pulse, the bipolar key 5 switches again and pushes the accelerating filter to the second source 7. Claims of the invention The attenuator contains the first and second segments of the transmission line, with one end of the first segment of the transmission line being the input and the other the output of the attenuator, the control voltage source, a two-pole switch, the first and second power sources, the first of which is made and the second is with negative polarity, a semiconductor diode, the first pin diodes, the first capacitor, an accelerating circuit, which is made in the form of a parallel connection of a potentiometer and the first capacitor, first and second. inductance, power filters, the control signal source being connected to the control input of a two-pole switch that is connected to the first and second power source, to the input and output of the attenuator are connected at one end to the chain, including the second section of the transmission line and the second a capacitor, to the other ends of which are connected the cathodes of the first pin diodes. and one of the terminals of the power filter, the anodes of the first pin diodes are connected to a common bus, the other terminals of the power filters are connected to the end of One to the terminals of the first inductance, and the other end to the accelerator with the knight. the circuit is connected to the output of a two-pole key; another output of the first inductance is connected to the cathode of an H-conductor diode, the anode of the capacitor connected to the first power source, characterized in that, in order to improve speed, the second pin diodes are additionally introduced, third capacitors, one outputs of which are connected to the common bus, and third transmission lines, which are made identical with a length equal to a quarter wavelengths short-circuited at one end, with the anodes of the second pin diodes connected to the input and output of the attenuator. Accordingly, their cathodes are connected to other ends of the third segments of the transmission line and other terminals of the third capacitors, respectively, and the second inductance is connected between the first segment of the transmission line and the common bus.