SU1478280A1

SU1478280A1 - Crystal oscillator

Info

Publication number: SU1478280A1
Application number: SU864145862A
Authority: SU
Inventors: Василий Куприянович Моисеев; Николай Николаевич Егоров
Original assignee: Предприятие П/Я Г-4152
Priority date: 1986-11-10
Filing date: 1986-11-10
Publication date: 1989-05-07

Abstract

Изобретение относитс к области радиотехники и может быть использовано в качестве источника стабильных электрических колебаний. Цель изобретени - повышение надежности запуска без снижени кратковременной стабильности частоты генерируемых колебаний. Генератор содержит четыре транзистора 1-4, п ть конд-ров 5-9, восемь резисторов 10-17, кварцевый резонатор 18, фильтр 19 нижних частот, зар дный резистор 20, интегрирующий кондр-р 21, катушку 22 индуктивности, диод 24. Дл достижени цели введен дроссель 23, включенный между коллектором транзистора 2 и выходом фильтра 19. Напр жение, пропорциональное напр жению на конд-ре 21, через резистор 15 поступает на входы транзисторов 1,2, обеспечива оптимальный режим их работы, при котором достигаетс максимально возможна долговременна стабильность генерируемых колебаний. Резисторы 10-14, 17 обеспечивают режим кварцевого г-ра по посто нному току. 1 ил.The invention relates to the field of radio engineering and can be used as a source of stable electrical oscillations. The purpose of the invention is to increase the reliability of the launch without reducing the short-term frequency stability of the generated oscillations. The generator contains four transistors 1–4, five conductors 5–9, eight resistors 10–17, a quartz resonator 18, a low pass filter 19, a charging resistor 20, an integrating condr – r 21, an inductance coil 22, a diode 24. To achieve the goal, a choke 23 is inserted between the collector of transistor 2 and the output of filter 19. A voltage proportional to the voltage on the conductor 21, through a resistor 15, is fed to the inputs of transistors 1.2, ensuring the optimum mode of operation, which maximizes possible long-term stability of generated fluctuations. Resistors 10-14, 17 provide a constant current quartz g-mode. 1 il.

Description

той резистор 15 поступают на базу пер-45 поступает на входы первого и второгоthe resistor 15 is fed to the base of the per-45 is fed to the inputs of the first and second

вого транзистора 1, который подобно второму транзистору 2 находитс в линейном режиме. Четвертый резистор 13 разв зывает цепь запуска от интегрирующего конденсатора 21.transistor 1, which, like the second transistor 2, is in linear mode. The fourth resistor 13 drives the trigger circuit from the integrating capacitor 21.

Емкость четвертого конденсатора 8 выбираетс таким образом, чтобы исключить шунтирование базовой цепи первого транзистора 1 на частоте напр жени пульсаций.The capacitance of the fourth capacitor 8 is chosen in such a way as to prevent shunting of the base circuit of the first transistor 1 at the frequency of the ripple voltage.

Напр жение пульсаций усиливаетс с помощью первого транзистора 1 и возбуждает колебани в параллельном LC-контуре 25, образованном катушкойThe ripple voltage is amplified by the first transistor 1 and excites oscillations in a parallel LC circuit 25 formed by a coil.

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транзистора 1 и 2, обеспечива оптимальный режим их работы, при котором достигаетс максимально возможна долговременна стабильность генерируемых колебаний.transistors 1 and 2, providing the optimum mode of operation, at which the maximum possible long-term stability of the generated oscillations is achieved.

Резисторы 10-14 и 17 обеспечивают режим кварцевого генератора по посто нному току.Resistors 10-14 and 17 provide a constant current quartz oscillator mode.

Claims

Invention Formula

A quartz oscillator containing the first and second transistors, the emitters of which, respectively, through the first

enters the inputs of the first and second

transistors 1 and 2, providing the optimum mode of operation, at which the maximum possible long-term stability of the generated oscillations is achieved.

Resistors 10-14 and 17 provide a constant current quartz oscillator mode.

Invention Formula

and the second resistors are connected to a common bus, a low-pass filter whose input is connected to the power bus, an inductor that is connected between the collector of the first transistor and the output of the low-pass filter, the first capacitor, the first output of which is connected to the output of the low-pass filter, the second capacitor which is connected between the collector of the first transistor and the base of the second transistor, the third resistor whose first output is connected to the base of the first transistor, the third transistor, the fourth, fifth and sixth resistors, the first e pins which are connected respectively to the base, collector and emitter of the third transistor, the third capacitor and the seventh resistor, the first pins of which are combined and connected to the collector of the second transistor, a charging resistor, an integrating capacitor that is connected between the first output of the charging resistor and the common bus, the fourth capacitor, which is connected between the base of the first transistor and the common bus; the fifth capacitor, the first terminal of which is connected to the collector of the third transistor, the eighth resistor, the first terminal to orogo connected to a common bus, quartz

a resonator, the first terminal of which is connected to the emitter of the second transistor, the fourth transistor and a diode, characterized in that, in order to increase the reliability of the start without reducing the short-term frequency stability of the generated oscillations, a choke is inserted that is connected between the collector of the second transistor and the low-pass filter output, the second terminals of the fifth resistor, the fifth capacitor and the charging resistor are connected to the power bus, the second terminals of the first capacitor and the third resistor are connected to the base of the second trap the second terminal of the quartz resonator is connected to the emitter of the first transistor, the diode is connected between the emitter of the fourth transistor and the common bus, the second terminals of the third capacitor and the seventh resistor are combined and connected to the emitter of the fourth transistor, the first output of the charging resistor is connected to the collector of the fourth transistor and the second terminal the fourth resistor, the second output of the sixth resistor is connected to the base of the first transistor and the second output of the eighth resistor, the base of the fourth transistor is connected to bschey bus.