SU1431048A2 - Variable sawtooth voltage generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in sweep generators. The purpose of the invention is to expand the functionality of the generator r by providing additional self-oscillating cutting of its work. The mode of operation of the external synchronization of the generator is maintained when the sync signal is applied to the control bus. The generator is co7 (in addition to the standard circuit elements shown in the drawing, a constant-current source 2, differential amplifier 4. Condenser 1 is charged from source 2 and when reaching a value equal to the voltage applied to the input of amplifier 4, at its output a voltage is formed, charging the capacitors 7 and 8. Under the influence of the voltage on the capacitor 8, the key transistor 8 opens, which causes the capacitor 1 to discharge. In this case, the charge of the capacitor 7 keeps the transistor 3 open to full ASP capacitor 1. Then tranz.istor 3 is closed and the process of forming the sawtooth starts anew. 1 yl. Btf / XO O G e (k

Description

dxaff tjnjyyff / f. 99

4 WITH

B5

Fire stress

at

14)

The invention relates to a pulse technique and can be used, for example, in sweep generators.

The aim of the invention is to expand the functionality of the device by providing an additional self-oscillating mode of its operation. The operation mode of the external synchronization of the device is retained when the clock signal is fed to the control bus. : In the drawing is electric

is a block diagram of the device.

The controlled sawtooth generator contains a capacitor 1, a direct current source 2, a switching transistor 3, a differential amplifier 4, an inverting input, which is connected to the bus 5 of the voltage source, an inverting input to the potential capacitor plate 1 i, and the output through a resistor 6 is connected to the base of the key transistor 3, the additional first 7 and second 8 capacitors, with an additional first capacitor 7 connected between the output of the differential amplifier 4 and the device common bus, will add flax second capacitor 8 - between the base of transistor 3 and common bus device. Bus 9 is given a start signal when operating in external synchronization mode.

The device works as follows.

When the supply voltage is applied The charge of the forming capacitor 1 from the source 2 of direct current and the voltage on this capacitor, which is the output voltage of the device, linearly increase. At that moment, when the voltage on the forming capacitor 1 is reached by A. Gorbachev, Editor, E. KopchaTehred, L.Oliynyk, Corrector M.Demchik

Order 5351/55

Circulation 929

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

the magnitudes of the reference voltage applied to the inverting input of the differential amplifier 4 flash, and the voltage appears at the output of the latter, under the action of which the capacitors 7 and 8 begin to charge. At the same time, the charging time of the capacitor 8 due to the presence of the resistor 6 is longer than the charging time of the capacitor 7, therefore at the moment when; and the voltage on the capacitor 8 reaches a value sufficient to unlock the key transistor 3, the voltage on the capacitor 7 is close to the output voltage of the differential amplifier 4. Under the action of the voltage on the capacitor 8 the key transistor 3 opens, which causes - a world capacitor 1. In this case, the discharge of the capacitor 7 keeps the key transistor 3 in the open state until the full discharge of the forming capacitor 1. Then the key transistor 3 is closed and the process of forming The sawtooth voltage begins anew.

20

Claims (1)

30 claims Controlled sawtooth generator by aut. St. No. 442570, characterized in that, in order to extend the functionality by providing a self-oscillating mode of operation, the first and second additional capacitors are inserted in it, the first additional capacitor being connected between the output of the differential amplifier and the common bus of the generator, and the second additional capacitor - do the base of the key trap of the stator and common tire of the generator. Subscription