Oscillators
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The document discusses the Colpitts oscillator, an electronic oscillator circuit that uses an LC circuit in its feedback loop. The Colpitts oscillator was designed by Edwin Colpitts in 1918 to generate high-frequency sinusoidal oscillations for radio applications between 10 kHz to 300 MHz. It produces stable, undamped oscillations using a feedback network of two tapped capacitors and an inductor. Key advantages are good wave purity and stability at high frequencies, though it can be difficult to design. Common uses include radio communications and applications requiring continuous, undamped oscillations over a wide frequency range.
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Different types of oscillator & it's application
The document discusses different types of oscillators. Oscillators are electronic devices that convert DC to AC and are used in many electronic devices. Some key oscillators mentioned include the Armstrong oscillator which uses an inductor and capacitor to generate oscillations, the Hartley oscillator whose frequency is determined by a tuned circuit consisting of a capacitor and inductor, and the Colpitts oscillator which is a combination of inductors and capacitors using voltage divider feedback. Oscillators find applications in areas like radio transmission, computing clocks, and medical devices and are important for generating alternating current signals.
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This presentation provides an overview of oscillators. It begins with an introduction and classification of oscillators. It then describes several common oscillator circuits including the tuned collector oscillator, Hartley oscillator, Colpitts oscillator, RC phase shift oscillator, and Wein bridge oscillator. Characteristics of each circuit like the feedback mechanism and frequency of oscillation are explained. Applications of oscillators in communication and electronics are mentioned. Key oscillator concepts like gain, feedback, and the Barkhausen criteria for sustained oscillations are also covered.
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1. An oscillator is an electronic device that converts DC power from a supply into AC power in a load without an external input signal.
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An oscillator is an amplifier that uses positive feedback to generate an output waveform without any external input signal. Positive feedback occurs when part of the output is fed back to the input in phase with the original signal. For oscillations to occur, the total phase shift around the feedback loop must be 180 degrees and the product of the open loop gain and feedback must equal unity, as stated by Barkhausen's criterion. The document discusses the basic theory, concept of positive feedback, and conditions for oscillations in an oscillator circuit.
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This document discusses oscillators with RC feedback circuits. It describes the basic concept of an oscillator that generates a periodic waveform without an external signal source. Specifically, it analyzes the operation of RC oscillators, describing the Wien bridge and phase shift oscillator. It provides the objectives, circuit diagrams, equations, examples, and advantages of the phase shift oscillator using an op-amp with a three-section feedback network.
working principle of oscillator and types of oscillatory circuit
Function of oscillator,and types of oscillatory circuit for ganerating different types of oscillations
Oscillators.ppt
1) Oscillators generate oscillating signals and are used to generate carrier signals in transmitters, local oscillator signals in receivers, and clock signals in digital systems.
2) There are several common types of oscillators including Wien bridge oscillators, RC phase-shift oscillators, and LC oscillators.
3) Oscillators work by providing positive feedback through an amplifier and a frequency selective feedback network to sustain oscillations. The frequency is determined by the feedback network to satisfy the Barkhausen criterion for oscillations.
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working principle of oscillator and types of oscillatory circuit
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3:国家专业人才认证中心颁发入库证书
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Oscillators
- 2. CONTENTS Oscillators Types of oscillators Colpitts Oscillators Uses of Colpitts oscillators Advantages and disadvantages
- 3. OSCILLATOR Convert Dc energy to Ac energy at desired (high) frequency. It is an like an amplifier with positive feedback Electronic oscillators are divided into: • Sinusoidal oscillator which produces an output having sine waveform.
- 4. OSCILLATORS • Non-sinusoidal oscillators which produces output having square, rectangular or pulse waveform.
- 6. TYPES OF OSCILLATORS There are two types of oscillators: • LC • RC LC oscillator that generate radio frequency and uses LC tank circuit for feedback • Hartley oscillator
- 7. TYPES OF OSCILLATORS • Crystal oscillator • Colpitts oscillator RC oscillator that generates audio frequency and uses RC tuned circuit in feedback • Phase shift oscillator • Wein bridge oscillator
- 8. COLPITTS OSCILLATOR Colpitts Oscillator designed by and named after an American Engineer Edwin H Colpitts in 1918. The Colpitts oscillator is a type of LC oscillator that uses an LC circuit in the feed-back loop. Colpitts oscillator are designed to generate high (wide ) frequency sinusoidal oscillations with radio frequency (10 KHz – 3ooMHz).
- 9. COLPITTS OSCILLATORS The feedback network in Colpitts oscillator is made up of a pair of tapped capacitors (C1 and C2) and an inductor L to produce a feedback necessary for oscillations. The output voltage is developed across C1. The feedback voltage is developed across C2. It produces stable and un-damped frequency.
- 10. USES OF COLPITTS OSCILLATOR It is used for generation of sinusoidal output signals with very high frequencies. It is used for the development of mobile and radio communications. It is frequently used for the applications in which very wide range of frequencies are involved.
- 11. USES OF COLPITTS OSCILLATOR Used for applications in which un-damped and continuous oscillations are desired for functioning
- 12. Good Wave Purity Fine performer at high frequency Good stability at high frequency Hard to design ADVANTAGES & DISADVANTAGES Advantages Disadvantages
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