SU758497A1 - Variable amplitude pulse shaper - Google Patents

Description

(54) FORMER OF PULSE VARIABLE AMPLITUDE

I

The invention relates to the field of pulsed technology and can be used to generate pulses in various devices of radio electronics, automation and computer technology.

A voltage generator is known that is made on transistors with additional symmetry or on the equivalent of two-base diode 1.

However, this generator is designed either to generate a sawtooth voltage (in standby mode), or to generate single pulses of constant amplitude with a high squabbility (in self-oscillation mode).

A known step voltage generator, made on two transistors with additional symmetry, is included in the diagonal of the bridge, consisting of a resistor divider and a circuit with a series-connected capacitor and a current generator on the transistor, the base of which is connected to the input of the device 2 through a resistor and diode.

This device essentially performs the functions of a pulse former, and the series of input pulses is converted into an output signal having a stepped shape. However, the latter device, as well as the previous one, does not allow to receive at the output individual pulses corresponding to the input, the amplitude of which increases linearly.

The purpose of the present invention is to form rectangular pulses with linearly varying amplitude, i.e., expanding the functionality.

Claims (2)

10 To achieve this goal, a driver formed on two transistors with additional symmetry included in a bridge diagonal consisting of a resistor divider and a circuit with a series-connected capacitor and a current generator on the transistor, the base of which is inserted through a resistor and diode to the output of the device resistors, two additional diodes and two transistors, the base of one of which is connected to the junction of the capacitor and collector of the current generator, the collector of this additional transistor with The emitter is connected to the collector of the second additional transistor through the load resistor, the base of which is connected to the emitter of the same transistor and to the common bus through a resistor through the resistor through two oppositely connected diodes to the connection point The diodes mentioned are connected through a power supply resistor. The drawing is a schematic diagram of the device. The device contains transistors 1 and 2, which are included in the circuit with additional symmetry or, in the so-called equivalent circuit of a two-base diode. The timing driver consists of resistors 3 and 4, a capacitor 5, and a current generator on the transistor 6. Resistors 3 and 4 form a voltage divider to obtain the reference voltage of the bridge. The base of the transistor 6 is connected to the input of the device through a diode 7 and a resistor 8. The base and the emitter of the transistor 6 are connected to a power source, respectively, through resistors 9 and 10. The base of the first additional transistor I1 is connected to the capacitor 5, and the base of the second additional transistor 12 is connected through counter-connected d: iody 13, 14 with the input device. A load resistor 15 is connected between the emitter and the collector of additional transistors. The base of the transistor 12 is connected to the busbar via a resistor 16, and a power source is connected to the connection point of the diodes 13, 14 via a resistor 17. In the initial state, a voltage is applied to the input of the device. In this case, the transistor 6 is closed, the capacitor 5 is discharged / transistors 1, 2 are closed. The diode 14 is closed at this time, and through the resistor 17 and the diode 13 an opening bias is applied to the base of transistor 12. Since the voltage at the base of the transistor 11 is zero, the current through the load 15 does not flow. When there is an input signal, i.e. when the input voltage becomes zero, the transistor 6 opens. At its base, the voltage determined by resistors 8, 9 is set, and the generator current is set by resistor 10. The principle of forming the output signal is illustrated in the drawing. Each input pulse increases the voltage across capacitor 5 in a linear fashion. When there is zero potential at the input, the diode 14 is unlocked and the transistor 12 is closed, and for more reliable locking it, the diode 13 is turned on, compensating for the voltage drop across the diode 14. Thus, during the charging of the capacitor 5, no current flows through the load 15. After the end of the input pulse, when the input voltage is equal to the power source, the transistor 6 is closed and the transistor 12 opens. The voltage from the capacitor 5 is transmitted through the transistor 11 (emitter follower) to the load 15, which at this time is connected through the transistor 12 to the common bus. When the voltage on the capacitor 5 reaches the reference voltage set by the resistors 3, 4, the capacitor is discharged through the transistors I, 2. Then the process of shaping the output pulses with a linearly varying amplitude is repeated. The steepness of the amplitude of the output pulses can be adjusted, for example, with the help of resistor 10, and the number of output pulses in a pack depends on the magnitude of the reference voltage. The invention The variable-amplitude pulse shaper, made on two transistors with additional symmetry, included in the diagonal of the bridge, consisting of a resistor divider and a circuit with a series-connected capacitor and a current generator on the transistor, the base of which through the resistor and diode is connected to the input of the device, differing from that, in order to extend the functionality, resistors, two additional diodes and two transistors are introduced into the device, the base of one of which is connected to the capacitor and the collector of the current generator are connected, the collector of this additional transistor is connected to the power source, and the emitter is connected via a load resistor to the collector of the second additional transistor, the base of which is connected to the emitter of the same transistor and a common bus through a resistor The diode is connected to the base of the last transistor, and the power supply is connected to the connection point of the mentioned diodes through a resistor. Sources of information taken into account in the examination 1. Vazherina 3. P. and others. Transistor pulse generators of a millisecond range. M., “Soviet Radio, 1974, p. 108, fig. 3-8. 2.International Journal of Electronics, sir. I, vol. 33 No. 1, 1974 (prototype).