SU566313A1 - Pulse generator - Google Patents

Description

(54) PULSE GENERATOR

I

The invention relates to a pulse technique and can be used in subcarrier frequency generators in telemetry and in phase locked loop oscillators in synchronous detectors and filter parax.

A pulse generator is known that contains the first and second equivalents of a two-base diode, between which emitters include a capacitor, the master circuit time, and the second base of the first equivalent two-base diode is connected to the output of the emitter follower through one of the resistors of the voltage divider,

However, this generator does not provide a linear modulation of the frequency of the output pulses by the input voltage.

To enable linear modulation of the frequency of the output pulses by the input voltage in the proposed pulse generator containing the first and second equivalents of a two-base diode, between the emitters of which the capacitor is switched on and the second base of the two-base diode

connected to the output of the emistor repeater through one of the resistors of the voltage divider, the second base of the second equivalent of the two-base diode is connected to the second base of the first equivalent of the two-base diode through a resistive voltage divider connected to the output circuit of the emitter follower connected to the input control terminal with its input tension

The drawing is a diagram of the proposed generator

Claims (3)

It contains an emitter follower on transistor 1, the first equivalent of a two-beam diode on transistors 2 and 3, the second equivalent of a two-base diode on transistors 4 and 5, a timing circuit having a capacitor 6 and a resistor 7, a resistive voltage divider on resistors 8 and 9, resistors 10-15 and terminal 16 of the input control voltage, with terminal 16 connected to the base of transistor 1. The collector of transistor 1 is connected to a positive power source. The emitter is connected to its negative bus through series-connected resistors 8 and 9. The common point of resistors 8 and 9 is connected through resistor 10 to collector of transistor 2 and base of transistor 3, and through resistor 1 to collector of transistor 4 and base of transistor 5. Transistor 5 emitter is connected via a resistor 7 connected in series and a capacitor with the emitter of transistor 3 connected to the collector of transistor 1 through resistor 12. The collector of transistor 1 is connected through resistor 13 with the emitter of transistor 5. The collector of transistor 5 connects ene trsh ican to the base 4, four transistor emitter connected to the negative power supply bus directly and base - via a resistor 15, .tranzistora collector 3 is connected to the base of transistor 2, bonded through a resistor; 14 with the emitters of transistors 2 and 4, the generator operates as follows. When the power is turned on, one of the transistors, for example, transistor 3, turns off and its collector current opens the transistor 2. Begin the lagain-shaped process of transition of the transistors 2 and 3 in saturation. At the same time, the charging current of the capacitor 6 flows across the resistors 7 and 13, creating a blocking potential j on the emitter of transistor 5. During the charging process of the capacitor 6, this potential is reduced. When the output voltage of the divider is reached on resistors 8 and 9, the transistors 4 and 5 open and the generator goes into the second steady state. The capacitor 6 through the resistors 4 and 5 is recharged. Transistors 2 and 3 are closed, then the process; repeats. The dependence of the frequency f of the output impulses of the generator on the output voltage of the resistive divider U, has the form. - Z17gn --v where E - power supply voltage UQ - threshold voltage unlock transistors 3, and 5, Г С (К,) ССК, -Л rn - Kj (R + T) R ,, / (), C is the capacitance of the capacitor 6, the resistance of the resistors is 7, 12 hours, 13 The modulation characteristic of the generator is linear if the voltage O V satisfies the equation) -m According to this equation, a coil is selected on the resistors 8 and 9. The invention The pulse generator containing the first and the second equivalents of the two-base diode, between the emitters of which the capacitor is switched on the time of the driving circuit, and the second base of the first equivalent a two-base diode is connected to the emitter output by means of one of the resistors of the resistive voltage divider, about TJ, and so that, in order to ensure that the output voltage of the output voltage is linearly modulated, The second base of the second equivalent of a two-base diode is connected to the second base of the first equivalent of a two-base diode through a resistor voltage divider, which is connected to the output circuit of an emitter follower connected by its input to an input control terminal stress. Sources of information taken into account during the examination: 1, Vazhenina 3. P., Pudrikov E.V. Transistor-pulse generators of millisecond range. .Sov. Radio, 1974, p. 100. -