With the 723, you can make the reference noise as low as you want, by heavy RC filtering. This applies whether you use its own reference or a better external reference. The 723 also seems to work quite happily with a feedback capacitor from the output to the inverting input, reducing the AC gain to unity. The output noise will then just be the buffer amplifier's input noise voltage, ~5-6nV/rtHz. This is about 20dB better than most modern 'low-noise' LDOs will do. (I can't remember what the amplifier's noise was like at very low frequencies - it was many years ago at a different company, and I don't have the results any more.) Garry Pascall Electronics Ltd - Registered in England No: 1316674 VAT Registration No: GB 448705134 Registered Office: Brunswick Road, Cobbs Wood, Ashford, Kent, TN23 1EH
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