SignalsAmplifiersVoltage AmplifiersTransconductance AmplifiersCurrent AmplifiersTransimpedance AmplifiersNegative FeedbackNominal Signal LevelsGain StructuresAmplification Then AttenuationAttenuation Then AmplificationRaising the Input Signal to the Nominal LevelActive Gain ControlsNoiseJohnson NoiseShot Noise1/f Noise (Flicker Noise)Popcorn NoiseSumming Noise SourcesNoise in AmplifiersNoise in Bipolar TransistorsBipolar Transistor Voltage NoiseBipolar Transistor Current NoiseNoise in JFETsNoise in Op-AmpsLow-Noise Op-Amp CircuitryNoise MeasurementsHow to Attenuate QuietlyHow to Amplify QuietlyHow to Invert QuietlyHow to Balance QuietlyUltra-Low-Noise Design with Multipath AmplifiersUltra-Low-Noise Voltage BuffersUltra-Low-Noise AmplifiersReferences