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Opamp Noise Figure | ||||||
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These equations calculate the noise figure of an opamp using parameters provided by vendors at the operating frequency and gain configurations. Be sure to note units both for the input parameters and for the equations, or you will end up with really bad results. Approximation Formula VNOISE = Noise voltage density, i.e. nV/sqrt(Hz) INOISE = Noise current density, i.e. pA/sqrt(Hz) RS = Source resistance, i.e. 50 Ω k = Boltzmann's Constant = 1.380 662 x 10-23 J/K T = Ambient temperature in Kelvin  Complete Non-Inverting Opamp Noise Figure Formula (for RS = RT)  Complete Inverting Opamp Noise Figure Formula (for RS = RT)   ENI = Input noise voltage IBN = Non-inverting input noise current IBI = Inverting noise current RS = Source resistor RT = Termination resistor RF = Feedback resistor RG = Gain setting resistor
Related Pages on RF Cafe
- Amplifier Design Resources - Opamp Noise Figure - Operational Amplifiers (Opamps) - Amplifier Vendors - RF / Operational / Log Video - Amplifier Vendors - Tubes, Vacuum, Klystron, TWT - Amplifier Vendors - Discretes - RF & Analog Amplifier Vendors - Packaged & MMIC - Amplifier Design Books - NEETS - Introduction to Amplifiers - Power Amplifier Linearization Using Diode On Voltage - GSM Handset Power Amplifier Control Loop Design | ||||||
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