SU830637A1

SU830637A1 - Pulse generator

Info

Publication number: SU830637A1
Application number: SU792799345A
Authority: SU
Inventors: Виктор Семенович Доценко
Original assignee: Предприятие П/Я Р-6916
Priority date: 1979-06-27
Filing date: 1979-06-27
Publication date: 1981-05-15

Description

(54) ГЕНЕРАТОР ПРЯМОУГОЛЬНЫХ ИМПУЛЬСОВ(54) GENERATOR OF RECTANGULAR PULSES

1one

Изобретение относитс к импульсной технике и может быть использовано в качестве задающего генератора в цифровых и аналого-цифровых устройствах.The invention relates to a pulse technique and can be used as a master oscillator in digital and analog-digital devices.

Известен мультивибратор, содержащий два последовательно включенных триггера, два диода, аноды которых подключены к входам первого триггера, к выводам врем задающего конденсатора и через резисторы к источнику управл ющего напр жени , а катоды диодов соединены с выходами второго триггера 1.A multivibrator is known that contains two series-connected flip-flops, two diodes, the anodes of which are connected to the inputs of the first flip-flop, the time of the driving capacitor and via resistors to the control voltage source, and the cathodes of the diodes 1 are connected.

Недостатком этого устройства вл етс узкий диапазон рабочих частот.A disadvantage of this device is the narrow operating frequency range.

Наиболее близким по технической сущности к изобретению вл етс генератор пр моугольных импульсов, который содержит два последовательно включенных RSтриггера , два диода, аноды которых подключены к выводам врем задающего конденсатора и через резисторы - к источнику управл ющего напр жени , а катоды соединены с выходами первого RS-триггера, два полевых транзистора с р-п-переходами, затворы которых подключены к выводам врем задающего конденсатора и к анодам двух диодов, истоки соединены с входамиThe closest to the technical essence of the invention is a generator of rectangular pulses, which contains two series-connected RS triggers, two diodes, the anodes of which are connected to the terminals of the time of the driving capacitor and through resistors to the source of control voltage, and the cathodes are connected to the outputs of the first RS -trigger, two field-effect transistors with pn-junctions, the gates of which are connected to the terminals of the time of the driving capacitor and to the anodes of two diodes, the sources are connected to the inputs

второго RS-триггера, а стоки подключены к общей щине 2.second RS-flip-flop, and drains are connected to a common bus 2.

Недостатком этого устройства вл етс снижение надежности работы при уменьшении частоты генерации из-за пр мого смещени затворов полевых транзисторов при переключении первого RS-триггера.A disadvantage of this device is a decrease in the reliability of operation with a decrease in the generation frequency due to the forward bias of the gates of the field effect transistors when switching the first RS flip-flop.

Цель изобретени - повыщение надежности работы генератора пр моугольных импульсов во всем рабочем диапазоне частот. Доставленна цель достигаетс тем, чтоThe purpose of the invention is to increase the reliability of the generator of rectangular pulses in the entire operating frequency range. Delivered goal is achieved by the fact that

в генераторе пр моугольных импульсов, содержащем два диода, два RS-триггера и два полевых транзистора, стоки которых соединены с общей щиной, затворы с обкладками врем задающего конденсатора и через резисторы с шиной управл ющегоin a square pulse generator containing two diodes, two RS flip-flops and two field-effect transistors, the drains of which are connected to the common length, the gates with plates, the time of the driving capacitor, and through the resistors with the control bus

напр жени , исток первого полевого транзистора соединен с S-входом первого RSтриггера , а исток второго полевого транзистора - с R-входом первого RS-триггера, пр мой выход которого соединен с S-входомvoltage, the source of the first field-effect transistor is connected to the S input of the first RS trigger, and the source of the second Field Effect Transistor is connected to the R input of the first RS flip-flop, the direct output of which is connected to the S input

Claims

the second RS flip-flop and the inverse output with the R-input of the second RS flip-flop, the diodes are turned on so that the direct output of the second RS flip-flop is connected to the anode of the first diode, the cathode of which is connected to the gate of the second field-effect transistor transistor - with the cathode of the second diode, the anode of which is connected to the inverse output of the second RS-flip-flop. The drawing is a schematic diagram of a generator of rectangular pulses. The square pulse generator contains an RS-flip-flop 1, the direct output of which is connected to the S-input of the RS-flip-flop 2, and the inverse output is connected to the R-input of the RS-flip-flop 2, to the inverse output of which is connected the anode of the diode 3, and to the direct the output is the anode of diode 4, the cathodes of both diodes are connected to the plates of the timing capacitor 5, while the cathode of diode 3 is connected through a resistor 6 to the control voltage, and the cathode to diode 4 is connected to a control voltage through a resistor 7, and two field-effect transistors, the drains of which are connected to the common ground, the source of the floor transistor 8 is connected to the S-input of the RS flip-flop 1, and the gate is connected to the cathode of diode 3, the source of the field-effect transistor 9 is connected to the R-input of the RS flip-flop 1, and the gate to the cathode of the diode 4, the direct and inverse outputs of the RS- trigger 2 is connected to the outputs of the device. The square pulse generator operates as follows. At the considered moment of time, at the direct output of trigger 2, the logic level is high, and at the inverse output, it is low. Both channels of transistors 8 and 9 are locked, the capacitor 5, previously charged (plus at the output of capacitor 5 connected to resistor 6, and minus at the output connected to resistor 7), is recharged through resistor 6, the source 10 is controlled voltage, diode 4, and direct output of trigger 2. At the direct output of trigger 1, there is a low logic level, and inverse output of the trigger 1, respectively, a high logic level. When the capacitor is recharged, the locking voltage on the gate of the transistor 8 decreases, when it becomes equal to the response threshold, the triggers 1 and 2 are set to opposite states. In this case, the diode 3, previously locked, opens, and the diode 4 is locked and the capacitor 5 is recharged in the opposite direction through the resistor 7, the source {O of the control voltage, the diode 3 and the inverse output of the trigger 2. the cycle decreases the gate voltage at the gate of the transistor 9 and when it becomes equal to the trigger threshold (generally different from the trigger threshold for transistor 9), the triggers 1 and 2 are set to the opposite state. Further, the processes in the circuit are repeated. The voltage of the control voltage source 10 in the general case can be both negative and positive (in the latter case, it should not exceed the threshold of the transistor and the trigger). It is practically convenient to connect the common point of resistors 6 and 7 with a common length. At the same time, the voltage at the gates of the transistors at the initial moment of capacitor recharge turns out to be equal to the sum of the potential of the logical unit of the trigger 2 and the voltage to which the capacitor is charged in the previous cycle, and at small levels, the threshold can be almost twice as high as the logical unit. The use of the proposed square pulse generator as compared with the known one allows for a longer pulse duration and increases the reliability of the device. DETAILED DESCRIPTION OF THE INVENTION Rectangular pulse generator comprising a diode, two RS flip-flops and two field-effect transistors, the drains of which are connected to a common power, the gates with plates, the time of the driving capacitor, and through resistors with a control voltage, are connected to the source of the first field-effect transistor. - the input of the first RS trigger, and the source of the second field-effect transistor - with the R input of the first RS flip-flop, the direct output of which is connected to the S input of the second RS-trcgger, and the inverse output with the R input of the second RS flip-flop, which differs in what with the purpose ovyscheni reliability, a direct output of the second RS-trigger is connected to the anode of the first diode, the cathode of which is connected to the gate of the second field effect transistor, and the gate of the first field effect transistor is connected to the cathode of the second diode, the anode of which is connected to the inverted output of the second RS-trigger. Sources of information taken into account in the examination 1. “Radio, Fernsehen, Electronic, 1976, 25, H7, p. 217, p. 14.

2. USSR author's certificate number 646424, cl. H 03 K 3/02, 10/17/77 (prototype).

vx

Ultrasound

T J-OV

ten