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The thermal noise increases with a larger resistance value while the current noise decreases. The thermal noise of a resistor is modeled as a rms voltage source in series with its resistance as illustrated in figure 1. Thermal Noise From Capacitor Circuit Analysis Physics Noise In Audio Amplifiers Introduction To Thermal Noise Any circuit element that is above absolute zero will produce thermal noise also called johnson noise. Resistor thermal noise calculator . What this means is that a simple resistor can produce white noise in any amplifier circuit. Thermal noise calculation calculator white johnson noise voltage level nyquist signal to noise noise from measuring data ratio sn temperature bandwidth noise figure eberhard sengpiel sengpielaudio. Otherwise you will not be able to take advantage of low noise performance of active components. Th...