Transcription of AN159 - analog.com
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AN159 - analog.com
Application Note 159AN159-1an159faFebruary, 2016 MEASURING OUTPUT VOLTAGE NOISEB eing Quiet is Nothing NewThe subject of noise has been broached before. Linear Technology Application Note 83, Performance Verifica-tion of Low Noise, Low Dropout Regulators, published in March of 2000, describes in detail a method for mea-suring output voltage noise of regulators down as low as 4 VRMS with confidence. The amplifier circuit and filters in the Application Note gave 60dB of gain across a 10Hz to 100kHz bandwidth. This is a good starting point to determine confidence in measurement of noise linear regulators such as the LT3042 are now in production with much lower output voltage noise levels. While the family of regulators released around the publi-cation of Application Note 83 operate with approximately 20 VRMS noise in the 10Hz to 100kHz band, the LT3042 is now available with noise levels as low as VRMS across the same frequency band.
A N 159 AN159-3 an159fa with AV = 20. This is followed by a 10Hz second-order Sallen-Key filter and one last stage of gain at AV = 20 bringing net gain to 10,000, or 80dB.
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