What is the impact on gain when frequencies increases in active differentiator?
For an ideal differentiator, the gain increases as frequency increases. Thus, at some higher frequencies, the differentiator may become unstable and cause oscillations which results in noise.
Which factor makes the differentiator circuit unstable at high frequencies?
4. which factor makes the differentiator circuit unstable? Explanation: The gain of the differentiator circuit (RF / XC1) increases with increase in frequency at a rate of 20dB/decade. This makes the circuit unstable.
What makes a differentiator and stable?
Explanation: The value of internal resistor and capacitor and feedback resistor and capacitor of the differentiator values should be selected such that fa < fb < fc to make the circuit more stable.
What happens to the accuracy of differentiation as the input frequency is decreased?
1: Accuracy and Usefulness of Differentiation. Note that as the frequency decreases, X_C grows, thus reducing the gain. Conversely, as the input frequency is raised, X_C falls in value, causing the gain to rise. This rise will continue until it intersects the open-loop response of the op amp.
What are the conditions for good differentiator?
In order to achieve a good differentiation, the following two conditions should be satisfied.
- the time constant RC of the circuit should be smaller than the time period of the input signal.
- the value of a capacitive reactance Xc should be 10 or.
Why integrator is preferred over differentiator?
Integrators are more linear than the differentiators and the integrators reduce the power consumption than the high pass filter. Integrators provide linear signal than the differentiators & also reduces power consumption than the high pass filter.
What happens to the accuracy of integration as the input frequency is increased?
This results in the gain of (R2 / R1). As the input signal frequency increases, the feedback capacitor gets charged and acts almost like short-circuit, bypassing the feedback resistor R2. This results in the gain, decreasing linearly at a rate of 20 dB per decade.