// multi-utility computation suite · offline · instant · precise
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sci.noise-figure-cascaded Calculator
Calculates the total noise figure of a cascaded amplifier chain using the Friis formula: NF_total = NF₁ + (NF₂−1)/G₁ + (NF₃−1)/(G₁G₂) + ... The first stage dominates overall noise figure — placing the lowest-NF amplifier first is critical in RF receiver design.
Inputs
Nf1 Db
Age in completed years. Many health and fitness formulas adjust for age.
Gain1 Db
Age in completed years. Many health and fitness formulas adjust for age.
Nf2 Db
Age in completed years. Many health and fitness formulas adjust for age.
Gain2 Db
Age in completed years. Many health and fitness formulas adjust for age.
Nf3 Db
Age in completed years. Many health and fitness formulas adjust for age.
Results
cascaded noise figure NF (dB)
Random or irrelevant variation in the measurement.
NF as factor
A dimensionless multiplier applied in the calculation.
stage 2 contribution (linear)
The phase or stage in the progression determined by the computed value.
stage 3 contribution (linear)
The phase or stage in the progression determined by the computed value.
Friis: NF_total = F₁+(F₂-1)/G₁+...
The combined total across all inputs and components.