App note: Noise sources in low dropout (LDO) regulators

Posted on Sunday, February 12th, 2012 in app notes by DP

Looking for a clean power supply for a sensitive analog circuit? Analog Devices describes the sources of noise in LDO voltage regulators, and provides some examples to limit and combat the noise.

In general, LDO noise comprises two components: intrinsic, or internally generated noise, and extrinsic, or externally generated noise.

  • Thermal and 1/f noise are the main contributors to internally generated noise and are a function of the design and semi-conductor technology of the LDO.
  • Extrinsic noise has many sources, but the most common is the noise on the input power supply to the LDO.
This entry was posted on Sunday, February 12th, 2012 at 11:00 am and is filed under app notes. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

One Response to “App note: Noise sources in low dropout (LDO) regulators”

  1. willemite says:

    I’ve been looking for ways to get rid of ripple on the LDO output. Been thinking about:

    the latter has all sorts of funky circuits I want to build elsewhere on their site.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!
  • Max: Seems like an unexpectedly violent way to remove the chip indeed. A hot air station should of course do the job just fine, but in...
  • jose: Part removal described here is pure butchery, the cheapest hot air station will do a fast and clean job removing the QFP, heat air to...
  • Cody: Yes please