SU758484A1

SU758484A1 - Controllable blocking-oscillator

Info

Publication number: SU758484A1
Application number: SU782618190A
Authority: SU
Inventors: Олег Михайлович Ежов; Василий Ильич Киндяков; Владимир Михайлович Скачков
Original assignee: Предприятие П/Я В-8337
Priority date: 1978-05-19
Filing date: 1978-05-19
Publication date: 1980-08-23

Description

(54) УПРАВЛЯЕМЫЙ БЛОКИНГ-ГЕНЕРАТОР(54) CONTROLLED BLOCKING GENERATOR

1one

Изобретение относитс к импульсной технике и может быть использовано в радиоэлектронных устройствах дл генерировани импульсов инфранизких частот, где необходима широка регулировка частоты в пределах одного диапазона. Конкретно устройство может быть использовано, например , в качестве генератора тактовых импульсов цифровых устройств.The invention relates to a pulse technique and can be used in electronic devices for generating pulses of infra-low frequencies, where a wide adjustment of the frequency within one band is necessary. Specifically, the device can be used, for example, as a generator of clock pulses of digital devices.

Известен управл емый блокинг-генератор , работающий в области инфранизких частот и позвол ющий получить щирокую регулировку частоты 1.A controlled blocking oscillator is known that operates in the field of infra-low frequencies and allows for a wide frequency adjustment 1.

Существенным признаком известного блокинг-генератора вл етс врем задающа цепь, выполненна в виде интегратора на операционном усилителе. Однако с выхода генератора снимаютс пр моугольные импульсы малой мощности с посто нной скважностью. Дл по |учени коротких импульсов в известном блокинг-генераторе необходимо применение дополнительного формировател , что усложн ет схему и увеличивает потребление энергии от источника питани .The essential feature of the known blocking oscillator is the time master circuit, made in the form of an integrator on the operational amplifier. However, low-power rectangular pulses with a constant duty cycle are removed from the generator output. To obtain short pulses in a known blocking generator, it is necessary to use an additional shaper, which complicates the circuit and increases the power consumption from the power source.

Известен другой управл емый блокинггенератор , содержащий п-р-п транзистор.Another controlled blocking generator is known, comprising an npp transistor.

трансформатор с первичной, вторичной и выходной обмотками, операционный усилитель , переменный и посто нные резисторы, конденсатор и диод, причем первична обмотка трансформатора соелтинена с коллектором транзистора и положительным полюсом источника питани , а вторична обмотка между его базой и общей щиной 2.a transformer with primary, secondary and output windings, an operational amplifier, alternating and permanent resistors, a capacitor and a diode, the transformer primary winding being connected to the transistor collector and the positive pole of the power supply, and the secondary winding between its base and the total thickness 2.

Недостатком этого блокинг-генератора вл етс недостаточный динамический диаШ пазон генерации импульсов, это объ сн етс тем, что простое увеличение хронирующей емкости дл работы в области инфранизких частот не всегда возможно, так как за врем короткого блокинг-процесса емкость не успевает зар дитьс до напр жени , обеспечивающего необходимый режим работы, что приводит к срыву генерации. Увеличение сопротивлени хронирующего резистора измен ет режим работы транзи(;:тора, что также приводит к срыву генерации и делаетThe disadvantage of this blocking generator is the insufficient dynamic pulse generation, which is explained by the fact that it is not always possible to simply increase the timing capacity to work in the region of low frequencies, because the capacity does not have time to charge for a short blocking process. providing the necessary mode of operation, which leads to a breakdown of generation. An increase in the resistance of the timing resistor changes the mode of operation of the transition (;: torus, which also leads to the generation failure

20 невозможным щирокую регулировку частоты следовани импульсов.20 impossible wide adjustment of the pulse frequency.

Claims

The purpose of the present invention is to expand the dynamic range of pulse generation. This goal is achieved due to the fact that in a well-known controlled blocking generator, which contains a pnp transistor, a transformer with primary, secondary and output windings, an operational amplifier, a variable and a constant resistor, a capacitor and a diode, the primary winding of the transformer is connected to the collector of the transistor and the positive pole of the power source, and the secondary winding between its base and the common ground. The output of the operational amplifier is connected to the emitter of the pnp transformer through the first resneter and through a capacitor with its inverting input and anode of a diode, the cathode of which is connected to the non-inverting input of the operational amplifier, while the inverting input of the operational amplifier is connected to the secondary output of the variable resistor through the second resistor , one of the conclusions of which is coi / inen with the positive pole of the power source, and the second through the third resistor is connected to the non-inverting input of the operational amplifier. The attached drawing is a circuit diagram of a controlled blocking generator. The controlled blocking generator contains a pn-transistor 1, a transformer 2 with primary, secondary and output windings, an operational amplifier 3, a variable 4 and a constant 5, 6 and 7 resistors, a capacitor 8 and a diode 9, and the primary winding of the transformer 2 is connected to the transistor 1 and the positive pole of the power supply, and the secondary winding is between its base and the common length. The output of the operational amplifier 3 through the first resistor 5 is connected to the emitter of the transistor I and through the capacitor 8 with its inverting input and anode of the diode 9, the cathode of which is connected to the non-inverting input of the operational amplifier 3, while the inverting input of the operational amplifier 3 is connected to the middle resistor 6 the output of the variable resistor 4, one of the conclusions of which is connected to positive. the source of the power source, and the second through the third resistor 7 is connected to the non-inverting input of the operational amplifier 3. The controlled locking oscillator operates as follows. At the initial moment of time, the timing capacitor 8 is charged in such a way that a positive potential is applied to the emitter of transistor 1, which keeps it in the locked state. The positive voltage removed from the potentiometer 4 is fed to the inverting input of the operational amplifier 3, so the capacitor 8 starts to discharge and the output voltage of the amplifier 3 (emitter of transistor 1) appears. When this voltage reaches a certain negative level, transistor 1 opens, a blocking process of forming a short pulse occurs. In this case, the capacitor 8 is charged from the power source + E through the primary winding of the transformer 2, the transistor 1 and the diode 9. The time constant of the charging circuit of the capacitor 8 is small, therefore, during a short pulse, it has time to charge to the initial voltage. The process then repeats. The rate of change of the linearly falling voltage and the frequency of output pulses determined by it depends on the size of the timing elements (capacitor 8, resistors 5 and 6) and the voltage taken from the middle output of potentiometer 4. In this generator, the frequency control range is determined by the depth of change of voltage by potentiometer 4. The use of a controlled blocking generator makes it possible to obtain excellent load capacity, with a small value of the timing capacity and to ensure the operation of the generator in infrared frequencies, to obtain a smooth tuning of the pulse frequency in the range of more than 50 dB. Claims of the invention A controlled blocking generator comprising a pnp transistor, a transformer with primary, secondary and output windings, an operational amplifier, a variable and a fixed resistor, a capacitor and a diode, the primary winding of the transformer connected to the collector of the transistor and the positive pole of the source power supply, and the secondary winding between its base and the total length, characterized in that, in order to expand the dynamic range of pulse generation, the output of the operational amplifier is connected through the first resistor with a pnp transistor emitter and through a capacitor with its own inverting input and anode of a diode whose cathode is connected to a non-inverting input of an operational amplifier, while the inverting input of an operational amplifier is connected via a second resistor to an average output of a variable resistor, one of which is connected to the positive pole of the power source, and the second through the third resistor is connected to the inverting input of the operational amplifier. Sources of information taken into consideration in the examination 1. US patent number 3842371, cl. 331-143, published. 15.10.74.

2. US patent number 3668557, cl. 331-112, published. 06.06.72.