SU930592A1 - Relaxation generator - Google Patents

Description

(Sk RELAXATION GENERATOR

one

The invention relates to a pulse technique and can be used to produce a frequency controlled pulse sequence.

A known generator containing a series-connected capacitor and a source of controlled current on a transistor with an emitter current-stabilizing resistor, regenerative to / LC on two transistors connected according to the equivalent circuit of a two-base diode (EDD), in which the input is connected to the capacitor plate and the output through a ytabilitron is source transistor emitter.

A disadvantage of the known generator is the contact utilization ratio of the power supply due to the additional voltage drop across the emitter toco-stabilizing resistor.

Also known is a relaxation generator with electrically controlled frequency, containing a controlled current source at the transistor, the base of which is connected to the input terminal, and the collector is connected via a diode to the first capacitor terminal, the second output of which is connected to the common bus, and two transistors made according to the EDD scheme, a resistive divider connected by the output of the regenerative key and the power supply bus, and a key on two transistors, the input of which is connected to the midpoint of the resistive Elena, and the output - collector of transistor is15 source of current 23.

The disadvantage of this generator is the reduced utilization of the supply voltage for

20 due to the additional voltage drop across the diode, q also the complexity of the device, the need to use two power sources.

The aim of the invention is to increase the utilization rate of the supply voltage.

The goal is achieved by the fact that in a relaxation generator containing a controlled current source on a transistor, a capacitor connected between a common bus and an input of a regenerative key on two transistors, made according to the EDD scheme, a resistive voltage divider connected between the output of a regenerative key and a common bus and the key on the transistor, the base of which is connected to the midpoint of the resistive divider, the collector of the key transistor is connected to the base of the transistor of the current source through a resistor, and the emitter to the input glue mine, said current source transistor collector is connected directly to the input of a regenerative switch.

The drawing shows a diagram of the device.

The device contains a current generator on transistor 1, an integrating capacitor 2, a regenerative switch on transistors 3 and and a resistor 5, resistors 6 and 7 of a voltage divider, a transistor switch on transistor 8, a limiting resistor 9, a resistor 10.

The generator works as follows.

In the initial state, the voltage across the capacitor is zero, and the output voltage of the regenerative switch is determined by the ratio of the resistors. The regenerative key is kept closed. The voltage at the emitter of the transistor sets the charge current of the capacitor 2.

When the voltage on the capacitor 3 in magnitude exceeds the voltage at the base of transistor 3, transistors 3 and i open, capacitor 1 is quickly discharged. In the course of this discharge, the transistor 8 is closed, since the voltage on its emitter is in absolute magnitude greater than the voltage on the base. Transistor 1 is also locked and does not affect the discharge process of capacitor 2. At the end of the discharge of the capacitor, the regenerative key is locked, transistors 8 and 1 are opened, and the pulse shaping process is repeated.

The invention allows to realize the maximum possible voltage utilization ratio, where and is the saturation voltage of transistor 1, and at the same time provides stable generation in a wide frequency range.

Claims (2)

1. USSR author's certificate number 10533, cl. H 03 K 3/02, 19b9. 2. USSR author's certificate No. 6S0216, cl. H 03 K 3/02, OB.OV .. fi ten €) -L / F I League BUT( l (