SU1711334A1 - Device for converting unipolar pulses to bipolar pulses - Google Patents

Description

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The invention relates to a pulse technique and can be used in digital communication systems, for example, to control modulators.

The purpose of the invention is to increase the speed of the device.

Figures 1 and 2 show, respectively, a functional diagram of the device and timing diagrams of its input and output signals.

The device contains a level 1 (signal) converter, made on diode 2, capacitor 3, resistors A-9 and transistors 10-12, buses 13 and 1A of negative potential and positive potential of a bipolar power source, switch 15 made on transistors 16 and 17, the first and second key elements 18 and 19i are each made on a resistor 20, a capacitor 21 and a transistor 22, the first and second rectifying elements are diodes 23 and 2k, a load element (resistor) 25 and a zero potential bus 26.

The device works as follows

In the initial state, when there is no signal at the device input, the zero level of this signal passes through the accelerating chain (capacitor 3 and resistor k, limiting resistors 5 and 6) and goes to the bases of transistors 10 and 12. At the same time, transistors 10, 12 and 17 are in the open state, and the transistors 11 and 16 are in the closed state. The current from the positive bus 1 of the power supply passes through the open transistor 1 of the transistor 22 of the element 19, the diode 2 and the resistor 25 to the zero potential bus 26. device is set-permanent positive voltage level equal to the voltage on the positive bus M of the power supply (figure 2).

When a positive polarity pulse arrives at the input of the device, transistors 10, 12, and 17 close, and transistors 11 and 16 open. The current from the zero potential bus 26 passes through a resistor 25, a diode 23, an open transistor 22 of the element 18, and a transistor 16 to the negative bus 13 of the power supply. At the output of the device, a constant negative voltage level is set equal to the voltage across

negative bus 13 power supply (figure 2). At the end of the input pulse, the device enters the initial state.

Key elements 18 and 19 are made on transistors 22, included in the scheme with a common base. Acceleration circuit (resistor 20 and capacitor 2.1) provide undistorted transmission of the front and rear edges of the pulse when operating on a low-impedance load. Dio 2 serves to accelerate the switching process of transistors 10 and 11.

The device can be performed on transistors 2T360A, 2T36AV, 2T629AM, 2T388A, 2T384AM-2, 2T625M, diodes, NR918B and microcircuits -.533LAZ, 530LAZ. I

The experiment, in which low-resistance p-i-n diodes, 2A5.22A with a resistance of 3-5 ohms, was used as a load, showed that the range of duration of the formation of output signals lies in the range of 10 n and, practically, to infinity.

Claims (1)

Invention Formula A device for converting unipolar pulses to bipolar pulses, comprising a level converter, whose information input is an input of the device, first and second key elements, first and second rectifying elements, negative potential and positive potential of the power source, and that, in order to increase the speed of the device, a switch and a load element are inserted into it, the output of the level converter is connected to the control input of the switch, The first and second information inputs of which are combined with the same power inputs of the damage converter and connected respectively to the buses of the negative and positive potentials of the power source, the switch output is connected to the inputs of the first and second key elements, the outputs of which are connected to the inputs of the first and second rectifier elements respectively The outputs of which are combined with the first output of the load element and are the output of the device, the second output of the load element is connected to the bus zero of potential + willows + Un Oh -ALAS b Rig. 2