Which of the following noise becomes significant at high frequencies?

Various types of internal noise are:

- Shot Noise:

- These Noises are generally arising in the active devices due to the random behaviour of Charge particles or carries

- In the case of the electron tube, shot Noise is produced due to the random emission of electron form cathodes

- Partition Noise:

- When a circuit is to divide in between two or more paths then the noise generated is known as Partition noise

- The reason for the generation is random fluctuation in the division

- Low- Frequency Noise:

- They are also known as FLICKER NOISE

- These types of noise are generally observed at a frequency range below few kHz

- Power spectral density of these noise increases with the decrease in frequency

- That's why the name is given Low- Frequency Noise

- High- Frequency Noise:

- These noises are also known as TRANSIT- TIME Noise

- They are observed in the semiconductor devices when the transit time of a charge carrier while crossing a junction is compared with the time period of that signal

- Thermal Noise:

- Thermal Noise is random and often referred to as White Noise or Johnson Noise

- Thermal noise is generally observed in the resistor or the sensitive resistive components of a complex impedance due to the random and rapid movement of molecules or atoms or electrons