Contents
What is resonant frequency in amplifier?
It selects the frequency. A tuned circuit is capable of amplifying a signal over a narrow band of frequencies that are centered at resonant frequency. When the reactance of the inductor balances the reactance of the capacitor, in the tuned circuit at some frequency, such a frequency can be called as resonant frequency.
What do you mean by resonance frequency?
The resonant frequency can also be defined as the natural frequency of an object where it tends to vibrate at a higher amplitude. For example, you could feel a bridge “shake” if the collective oscillation force from vehicles caused it to vibrate at its frequency.
Which is the maximum gain of a tuned amplifier?
The value of Z C depends upon the frequency of the tuned amplifier. As Z C is maximum at resonant frequency, the gain of the amplifier is maximum at this resonant frequency. The range of frequencies at which the voltage gain of the tuned amplifier falls to 70.7% of the maximum gain is called its Bandwidth.
What is the gain of an op amp?
The frequency at which the op-amp’s gain reaches 0 dB is called the unity-gain frequency (denoted by f t f t). This value tells us the frequency at which the op-amp stops functioning as an amplifier, and it also gives us a convenient way to calculate the op-amp’s open-loop gain at a given frequency.
How to calculate the frequency response of an amplifier?
The most common tool used to represent the frequency response of any system is the Bode plot. It consists of the normalized gain A V (dB) as a function of the frequency in log scale. A simplified Bode graph of an amplifier is shown in the Figure 1 below :
What is the normalized gain of a mid amplifier?
Therefore, when A V =A V,mid, the normalized gain (written indifferently A V) is A V (dB)=0. This sets a 0 dB reference when the gain is maximum. It is important to note that when the power is divided by two, we observe that AP(dB)=10log (0.5)=-3 dB.