SU902221A2

SU902221A2 - Multivibrator

Info

Publication number: SU902221A2
Application number: SU792804296A
Authority: SU
Inventors: Владислав Сергеевич Голуб
Original assignee: Предприятие П/Я А-7358
Priority date: 1979-08-03
Filing date: 1979-08-03
Publication date: 1982-01-30

Description

(54) МУЛЬТИВИБРАТОР(54) MULTI-VIBRATOR

1one

Изобретение относитс к радиоэлектронике и может быть использовано дл генерировани колебаний несинусоидальной формы .The invention relates to electronics and can be used to generate non-sinusoidal oscillations.

По основному авт. св. № 393802 известен мультивибратор, содержащий три операционных дифференциальных усилител , выход первого усилител через резисторы соединен с инвертирую1ци1Ли входами второго .и третьего усилителей, выход второго усилител соединен с неинвертирующим входом первого усилител и через конденсатор со своим инвертирующим входом, выход третьего усилител соединен с инвертирующим входом первого усилител и через резистор со своим инвертирующим входом 1 .According to the main author. St. No. 393802 a multivibrator is known that contains three operational differential amplifiers, the output of the first amplifier is connected via inverters to the inputs of the second and third amplifiers, the output of the second amplifier is connected to the non-inverting input of the first amplifier, and through the third amplifier is connected to an inverting input the first amplifier and through a resistor with its inverting input 1.

Недостатком известного устройства вл етс изменение напр жени смещени нул первого усилител , привод щее к ухудщению стабильности частоты и скважности генерируемых мультивибратором импульсов.A disadvantage of the known device is a change in the bias voltage of the first amplifier, leading to a deterioration in the frequency stability and duty cycle of the pulses generated by the multivibrator.

Цель изобретени - повыщение стабильности частоты и скважности генерируемых импульсов.The purpose of the invention is to increase the stability of the frequency and duty cycle of the generated pulses.

Поставленна цель достигаетс тем, что в мультивибратор, содержащий три дифференциальных операционных усилител , выход первого из которых через резисторы соединен с инвертирующими входами второго и третьего, выход второго усилител соединен с неинвертирующим входом первого и черезThe goal is achieved by the fact that in a multivibrator containing three differential operational amplifiers, the output of the first of which is connected via resistors to the inverting inputs of the second and third, the output of the second amplifier is connected to the non-inverting input of the first and

5 конденсатор со своим инвертирующим входом , а выход третьего усилител соединен с инвертирующим входом первого и через резистор со своим инвертирующим входом, дополнительно введен резистор, соедин юJQ щий выход второго усилител с инвертирующим входом третьего усилител .5 a capacitor with its inverting input, and the output of the third amplifier is connected to the inverting input of the first and through a resistor with its inverting input, a resistor is additionally added, connecting the second output of the second amplifier to the inverting input of the third amplifier.

На чертеже приведена принципиальна схема мультивибратора.The drawing is a schematic diagram of the multivibrator.

Claims

The multivibrator contains a differential operational amplifier 1, the output of which is connected through resistors 2 and 3 to the inverting inputs of differential operational amplifiers 4 and 5, the output of amplifier 4 is connected to the non-inverting input of amplifier 1, through a resistor 6 to the inverting input of amplifier 5 and through a capacitor 7 to its inverting m entrance. The output of the amplifier 5 is connected to the inverting input of the amplifier 1 and through a resistor 8 with its own inverting input. The non-inverting inputs of amplifiers 4 and 5 can be used to control the frequency of the multivibrator or can be connected to a common thickness. At the inputs of the amplifier 1, the output voltages of the amplifiers 4 and 5 are subtracted. In the case of equality of the differential voltage, the threshold of operation of the amplifier 1 switches. The output voltage of the amplifier 4 is a symmetrical sawtooth voltage, and the output voltage of the amplifier 5 is the sum of the sawtooth voltage and square voltage. Due to the presence of a saw-tooth component in the output voltage of amplifier 5, the difference in voltage across the inputs of amplifier 1 increases, which in turn reduces the effect of bias voltage, zero of amplifier 1 on the frequency and duty cycle stability of the generated pulses of the multivibrator. The introduction of an additional resistor into the multivibrator circuit allows us to significantly increase the frequency stability and duty cycle of the generated pulses. The invention formula Multivibrator auth. St. No. 393802, characterized in that, in order to increase the frequency stability and duty cycle of the generated pulses, the output of the first additional operational amplifier is connected via an additionally introduced resistor to the input of the second additional operational amplifier and the output of the resistive divider. Information sources taken into account during the examination 1. USSR author's certificate No. 393802, cl. H 03 K 1/00, 08.26.71.