This calculator determines the thermal noise power (Pn) in dBm based on system temperature and bandwidth. It helps quantify the unavoidable background noise present in electronic communication systems.
PINCH OFF VOLTAGE – pinch off voltage in jfet
Formula
Pn = 10 * log10( (k * B * T) / (1 mW) )
CMOS PMOS NMOS (nmos pmos and cmos)
Formula Explanation
- k = 1.38064852 × 10⁻²³ (Boltzmann constant)
- B = Bandwidth in Hz
- T = Temperature in Kelvin (K)
- 1 mW = 1 × 10⁻³ W (used for conversion to dBm)
Example
Input: T = 290 K, B = 1 MHz
IS THERE ANY DIFFERENCE BETWEEN PHOTODIODE AND…
Result: Pn ≈ -114 dBm
Who uses it
Helpful for RF and communication engineers to estimate system noise levels and receiver sensitivity.