[time-nuts] Low noise voltage regulators

Garry Thorp GThorp at pascall.co.uk
Thu Feb 25 13:54:08 UTC 2010

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.)
Pascall Electronics Ltd - Registered in England No: 1316674 VAT Registration No: GB 448705134 Registered Office: Brunswick Road, Cobbs Wood, Ashford, Kent, TN23 1EH

The transfer of any controlled technology contained in or attached to this email is covered by the "Open General Export Licence (Technology for Military Goods)", granted by the United Kingdom Secretary of State.

The information contained in this email is provided as a personal communication of the sender and, as such, is not binding on Pascall Electronics Ltd. unless the intended recipient has been notified by signed postal or fax communication that the sender is authorised to commit Pascall Electronics Ltd. on the subject matter concerned.The contents of this email are confidential to the intended recipient at the email address to which it has been addressed. It may not be disclosed to or used by anyone other than this addressee, nor may it be copied in any way. If received in error, please contact Oli Poole, at opoole at pascall.co.uk, quoting the name of the sender and the addressee and then delete it from your system.

More information about the time-nuts mailing list