3.3V for Accelerometers

[cksa]

So I'm designing this portable device that incorporates accelerometers and gyros for inertial measurement purposes. This of course requires a precise and stable voltage supply to these components. However, I am stuck in thinking of how to achieve this whilst not using too many batteries.

For example, I could use one AAA and boost it up to 3.3V, but will this be stable enough? Could I boost it up to say 5V and use a linear regulator to regulate it down to achieve less ripple? Since there are other devices on the 3.3V rail, would it be a good idea to use TWO separate 3.3v regulators, with one directly dedicated to the ADC and the accelerometers and gyro?

I could also use one li-poly, but that requires a buck-boost or sepic DC-DC converter, again, switching regulators, will there be too much vout ripple?

Thanks,

[Mechatrommer]

the is no such thing as accuracy in navigation terminology unless u stick with GPS system... satellites & beacons = man made.... stars & landmarks = god made. i dont see the point of trying harder to design a bulletproof electronics hardware if its for the sake of accuracy, but if its for reliability,durability and quality... then yes! for me... a battery and a bypass caps will just do fine. no offense, but i'm a navigation system designer as well.... not professionally though, just hobby it is for navigation isnt it? or positioning of some sort?

[cksa]

Oh lol. It isn't for outdoor applications, so GPS wouldn't work. It's for a sports application very much indoors

[Mechatrommer]

once you are done with the electronics part, the mechanical aspects will come into your way... then it goes to programming part, or circuit tuning part... and it will go merry go round and round until u satisfy... i think

[marianoapp]

and when you finish and get something like this you know it was worth it

[Mechatrommer]

hell! thats aggressive! last time i dealt with browned out mcu and motor kickback issue, several config of caps will do the trick, other than that, i only accept what gyros gave me. just keep focusing on what voltage level you are referencing at. and if its the voltage accuracy for the gyros you are worrying about, i suggest you wire it directly to the main power supply (with superb noise suppression of course!), with the stepped down/up voltage will feed the rest that dont need the accuracy. just my limited knowledge tells.