Noise circuit diagram of processing feeble signal

Published:2011/6/16 23:59:00 Author:Sophia | Keyword: Noise circuit, Processing feeble signal | From:SeekIC

When designing the circuit of processing feeble AC signal, the key proplem of restricting performance is noise. The noise can be classified as three types: th ermal noise from signal source, the noise from the interior and exterior of electrical device. External noise has a transmission line noise, electrostatic noise coupling, electromagnetic coupling noise, radio noise and radiation, physical vibration, heat, light and other form of noise. Thermal noise is formed from the irregular movement of free electrons inside conductor. Thermal noise voltage Vn = 4KTRB, among which, K is Boltzmann constant (1.38x1O-23JK), T is thermodynamic temperature (K), R is the resistance value (Ω), B is the bandwidth product (HZ). From the above equation, thermal noise and the thermodynamic temperature, resistance, and bandwidth is proportional to the square root of the product. Thermodynamic temperature is calculated at T = 300. .



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