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Noise Power & Voltage

NoisecomNoisewaveNoise power is based on the thermal noise power at the input of the system, along with system gain and noise figure:

PThermalNoise  = k * T * B [Watts], where RF Cafe - Noise power equation formula

 
Multiply by 1000 to obtain milliwatts and then convert to dBm units or convert to dBW units and add 30 dB:

PThermalNoise [dBm] = 10 * log10 (1000 * k * T * B)

or

PThermalNoise [dBm] = 10 * log10 (k * T * B) + 30


Now that we have the thermal noise at the input, add the system gain and the additional noise added by the system (the NF) to get the noise power at the output:

 PNoise@Output [dBm] = PNoise@Input + GainSystem + NFSystem



VThermalNoise  = Sqrt (4 * k * T * B)  [Volts]


Thermal Noise Voltage as a Function of Resistance and Bandwidth - RF Cafe


Related Pages on RF Cafe
- Noise Figure <--> Noise Temperature Calculator
- Noise Power and Voltage
- Cascaded Noise Figure
- Noise Figure Meters & Noise Generators
- Noise Sources


"Noise and Interference" - WebEE Tutorial

RF Cafe Software

RF Cascade Workbook
 RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio
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