Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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.

Register Log in

Filter for Sigma Delta ADC (Gm-c or Mosfet-c or Ladder)

Status
Not open for further replies.

abhishek_angadi

Newbie level 4
Joined
Jul 29, 2010
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
Lubbock
Activity points
1,321
Hi all,
I am new to IC design. I am designing a sigma delta modulator for a very low frequency application of 20 Hz(its a bio sensor so it needs to be low power also). Which is the best continuous time filter to use. ( ladder type, Gm-C or Mosfet-C ) or just a general amplifier with C in feedback.

Thanks in advance..

Abhishek
 

ic98

Member level 4
Joined
Oct 1, 2010
Messages
76
Helped
14
Reputation
30
Reaction score
14
Trophy points
1,288
Activity points
1,696
Is your modulator continuous?
Sharper the filter, more the consuming power!! You should specify your filter order (sharpness) according to your system specifications.
Anyway see this filter design book:
1999 - Deliyannis - Continuous Time Active Filter Design
 

abhishek_angadi

Newbie level 4
Joined
Jul 29, 2010
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
Lubbock
Activity points
1,321
Hi,
It is continuous and second order. Prof has asked me to get the best SNR and accuracy of 12 bits to start with.
Thanks
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top