The essential components of a feedback LC oscillator include an inductor (L) and a capacitor (C) connected in a feedback loop, a gain element such as a transistor or amplifier to compensate for energy losses, and a feedback network to sustain oscillations by providing positive feedback. The LC tank circuit stores and exchanges energy between the inductor and capacitor to generate an oscillating signal at the resonant frequency of the tank circuit.
Self-tuning feedback
You can create an oscillator without using LC components by using an operational amplifier (op-amp) configured as an astable multivibrator. The op-amp can generate a square wave output using resistors and capacitors to create the necessary feedback loop for oscillation. This circuit can provide a stable frequency output without the need for inductors or capacitors.
LC oscillators use inductors and capacitors to generate a frequency, while crystal controlled oscillators use a quartz crystal to establish the frequency. LC oscillators can be less stable and accurate compared to crystal controlled oscillators, which offer better precision and stability. Crystal controlled oscillators are commonly used in applications where precise frequency control is essential.
There are two differences: a) the amount of feedback you allow b) whether you wire a frequency-determining device into the circuit First things first: ANY amplifier circuit that uses feedback, which these days is most of 'em because feedback improves the quality of an amp's output, will oscillate if there's enough feedback. This poses a real problem because the more feedback you use, the better the amp sounds. Your challenge, therefore, is to make an amp that uses not quite enough feedback to oscillate. The other is equally critical. If you want oscillation you usually want it on a specific frequency. You can build an LC tank or a crystal into the circuit to determine the output frequency if you're building an oscillator; if you're building an amp you wouldn't do this.
An oscillator works in different ways in different electronic equipment. For example, there is a quartz oscillator in a quartz watch that can keep track of the time. A pendulum of a clock is an oscillator that goes back and forth using potential and kinetic energy.
Self-tuning feedback
1.CE amplifier circuit 2.LC oscillator circuit
A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~ A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~
You can create an oscillator without using LC components by using an operational amplifier (op-amp) configured as an astable multivibrator. The op-amp can generate a square wave output using resistors and capacitors to create the necessary feedback loop for oscillation. This circuit can provide a stable frequency output without the need for inductors or capacitors.
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
DISADVANTAGES OF RC PHASE SHIFT OSCILLATOR.1. The output is small due to smaller feedback. 2. It is difficult for the Circuit to start oscillations.3. The Frequency stability is not so Good.4. It requires high Vcc. For large feedback.
depends on the oscillator and its purpose
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
The difference between an RC and LC is that the frequency - determining device in the RC oscillator is not a tank circuit. LC can operate with A or C biasing, while RC can only operate with A.
A: actually any active components will oscillate with positive feedback A transistor can be used as an amplifier along with an LC tank circuit to form an oscillator; it is an active device (as LIBURNO states) which will amplify the feedback signal coming out of the LC tank circuit. The tank circuit has a natural resonant frequency, meaning the L and C together will try to generate a specific frequency; this is then fed back into the input of the transistor amplifier, and the output is fed to the LC tank circuit exacerbating this oscillation until it reaches its' maximum level. An inverting amplifier can be used similarly; the output is fed to the input; this will cause the output to change as fast as the amplifier can. The frequency of this design is much harder to control, but potentially higher. Also, without the LC tank, the output voltage will remain lower.
Because an RC oscillator is affected by stray capacitance in the active components in the circuit. HF oscillators use an LC tuned circuit to define the frequency.
Four types of LC oscillators include voltage controlled oscillators, drift control oscillators, crystal oscillators, and tuned circuit oscillators. A tuned circuit oscillator is the most common type of oscillator.