Can capacitors and inductors be used in amplifiers? How about considering and describing the noise of these two components? 2

However, capacitors and inductors themselves also introduce some noise. The main sources of noise in capacitors are dielectric losses and resistance. The loss of dielectric can cause thermal noise inside capacitors, while resistors can introduce internal noise sources into capacitors. The main sources of noise in inductors are coil resistance and eddy current losses. The resistance of the coil will introduce internal noise of the inductor, while eddy current losses will cause magnetic field noise to be generated inside the inductor.  diode

To quantify the noise of capacitors and inductors, noise indicators are often used to describe them. Common noise indicators include noise coefficient, noise voltage, and noise power. The noise figure is the ratio of the noise voltage to the signal voltage, used to describe the degree to which the input signal is covered by the noise voltage. Noise voltage is the amplitude of the noise signal generated by capacitors or inductors, used to represent the magnitude of the noise level. Noise power is the ratio of the square of the noise voltage to the resistance, used to represent the power level of noise.  diode

To reduce the noise of capacitors and inductors, the following measures can be taken:

1. Choose low-noise capacitors and inductors. The noise characteristics of capacitors and inductors from different models and manufacturers may vary, and the noise level can be reduced by selecting low-noise components.  diode