News:

Welcome to the Australianelectronicgoldprospectingforum founded in July 2010, an add free totally independent forum with over 70 boards and paid for and managed by the Admin.Topics:10,008  Total forum Posts:48,405 Members:1003 Total page views19,225,100: Guests can only see a limited number of boards at present. .Registration of new members must be approved by admin.
Please note that some adult topics and themes may be discussed on this  forum
 All  original Photos and posts and  original materials displayed on this site are COPYRIGHTED and remain the property of the poster and the  Australian electronicgoldprospectingforum.com. All messages on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner and neither SMF or the forum software developers or the forum host shall be held responsible for the content of any message. Admin reserves the right to remove any offensive or objectionable posts. No defamatory material or politics/religion or issues of race will be permitted.Registered members may post links and use the forums pm immediately without having to make 10 posts. The forum is add free and is hosted in Australia.
Guest posting is permitted . Guest posts are moderated and will not appear until approved  by  admin.This forum also has 2 moderators as well as admin so in my absence any objectionable posts/links can be removed.
For any issues /complaints  about any  about posts here post as a guest on the guest posting  board. and admin will see them.

Main Menu

Chopper Amplifiers Achieving Precision

Started by Doug, Tuesday July 13 2010 11:46:57 AEST AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

Doug

Chopper Amplifiers
A chopper amplifier is a type of amplifier that exhibits precise outputs and low noise.
Also called Auto-Zero, Auto-Null,Ping-Pong, Stabilized and Commutated Amplifier.
A chopper amplifier is often a compound amplifier
http://www.national.com/onlineseminar/2004/chopperamps/Achieving%20Precision.pdf
doug :)
Doug, information  provider extraordinaire!
This forum does not endorse or recommend any modifications  carried out by Woody.
Woody is not a member of this forum and  never will be.
For modifications we recommend detectronicsaustralia at Dunolly,Vic
 https://www.detectronicsaustralia.com/mods

Davor

I think this is the one you were referring to: http://www.bioee.ee.columbia.edu/courses/upload/Bibliography/enz_procieee_1996.pdf

I concluded that practically all new builds can benefit from chopper approach to gain blocks. PI and VLF CW alike. point is that the targets' response falls around ~10Hz range, right in a middle of a 1/f region of the vast majority of gain devices. My point here is that by avoiding low pass filtering/integration right after the sampling stage(s) and instead amplifying the signal in it's chopped form, you effectively avoid 1/f noise altogether. MD-s gain blocks accept a chopped signal of various kinds anyway, so speaking of choppers' limitations is completely misleading here - you reap only it's benefits.

In short, early integration prior to amplification is just plain wrong. By replacing gain and integration sequence you in effect obtain a chopper configuration with all it's benefits, and without using any expensive super sexy chopper stabilised chips.
The laws of physics actually work – even in Nature...

Quick Reply

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Note: this post will not display until it has been approved by a moderator.

Name:
Email:
Shortcuts: ALT+S post or ALT+P preview

SMF spam blocked by CleanTalk