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Classification of oscillators?
Phase-shift oscillator Armstrong oscillator Cross-coupled LC oscillator RC oscillator
Why RC oscillators are not suitable for high frequency generation?
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.
Increasing the capacitance of the coupling capicitor in an RC coupled amplifier has what effect?
the circuit will pass waves of a lower frequency
How do you calculate RC phase shift oscillators gain?
29
What are the applications of RC phase shift oscillator?
RC phase shift oscillators are used for musical instruments, oscillators, voice synthesis, and GPS units. They work at all audio frequencies.
Why RC oscillators are not used for high frequencies?
The "C" in RC is capacitance, and at high frequencies, the C will shunt the signal more than at lower frequencies. The loss through the cap will climb right along with frequency. And as the cap's performance goes down, so, too, does the circuit performance. RC oscillator performance is far from linear at the top of the frequency range.
Frequency response curve of RC coupled amplifier?
at low frequency less than 50hz the voltage gain decreases with decreasing frequency and at mid frequency{50hz to 20khz} the voltage gain is uniform because resistor value are independent of frequency change and at the high frequency votage gain falls.
Why you need RC coupled amplifier?
Rc coupled amplifier is used where good frequency response required. in case of multistage amplification system,To prevent resistance of one stage to come in parallel with next stage, it is used. we use capacitor as a coupling element between two consecutive stages.
Why frequency is assumed to be high while calculating stray capacitance of a single stage RC coupled amplifier?
A: Think about it if there is no frequency there is no problem. The problems becomes apparent as the frequency increases because adjacent proximity now becomes capacitors to influence the circuitry
Circuit diagram of RC coupled amplifier?
One of the several uses of an RC coupled amplifier is to amplify the given input signal. It makes use of a sinusoidal input signal.
Why phase shift oscillator uses three RC pairs?
The frequency stability of oscillators depend on the rate of change of phase with frequency. RC sections help improve the frequency stability. The net phase shift introduced by the RC feedback network is 180 degrees ,which contains n sections.Thus each RC section introduces 180/n degree phase shift. When 2 RC sections are cascaded due to low phase change rate the frequency stability is low. For 3 sections cascaded the phase change rate is high and hence there is improved frequency stability. However for 4 RC sections there is an excellent phase change rate resulting in the most stable oscillator configuration. But 4 RC sections increases cost and makes circuit bulky. Hence phase shift oscillators make use of 3 RC sections in which each section provides a phase shift of 60 degree. The latter is generally used in high precision applications where cost is not much regarded and only accuracy plays a major role.
What are merits and demerits of RC coupled amplifier?
Merit: RC-coupled amplifiers are simple and inexpensive to design and construct, providing good frequency response over a wide range of frequencies. Demerit: They have limited low-frequency response due to the capacitive coupling, which can result in signal attenuation at lower frequencies. Additionally, they may suffer from coupling capacitor leakage, affecting the overall performance of the amplifier.
