Functions and indicators of LNANoise figure of two-port networkBipolar LNAMOS LNANon-quasi-static (NQS) model and gate-induced noiseCMOSMinimum noise figure and best noise matchingReferencesFunctions and indicators of LNA• The first-stage active circuit, its noise, nonlinearity, matching and other performance are crucial to the entire receiver• Main indicators – Noise figure (NF) depends on system requirements and can range from less than 1 dB to several dB. NF is related to the operating point – Gain (S21) Larger gain helps to reduce the impact of noise in the subsequent circuit, but it will cause linearity degradation – Input and output matching (S11, S22) determines the frequency response of the RF filter at the input and output – Reverse isolation (S12) – Linearity (IIP3, P1dB)Interference signals that are not filtered out can reduce the reception quality through intermodulation and other means
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