Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

ultra low power accelerometer

Status
Not open for further replies.

yazou35

Junior Member level 1
Joined
Apr 23, 2006
Messages
18
Helped
6
Reputation
12
Reaction score
1
Trophy points
1,283
Activity points
1,533
Hi,
I want to design an acceleration measurement circuit that draws less than one microampere. I will use a capacitive piezo sensor and a FET buffer (Figure 40 in this document ) :

**broken link removed**

I'm looking for a FET to use as buffer that draws about 200 nA. Does a such FET exist ?

My second idea to make an ultra low power is to work in a duty cycle mode . But I want to filter (RC low pass filter) the accelerometer output around 5 Hz and sample with Fs= 20 Hz. The LPF settling time is 200 ms which is greater than the sampling period (50 ms) which make power cycling impossible. Any idea to use power cyclying in the case of LPF?

Sincereley
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top