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binsad
Joined: 15 Dec 2008
Posts: 8
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 02 Jul 2009 16:32 ultra sound range meter |
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Hi,
I was about to start a project "UltraSound Range Meter".
In the receiver section, i was seen that there are 2 stages of amplifiers in order to amplify the received signal to 1000 times. Can i use a single stage amplifier instead of 2 stages????
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02 Jul 2009 16:32 Ads |
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alberto1683
Joined: 13 Jul 2007
Posts: 19
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02 Jul 2009 18:27 ultrasound range meter |
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Hi ..
one year ago, I made that project,
I used two OP. I have found resistance values for cascade amplifiers
configuration.
The first circuit had 10 of gain, then there were a filter and finally the second amplifier (100).
The cascade configuration avoid noise between stages.
Regards,
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malik_123
Joined: 14 May 2007
Posts: 44
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02 Jul 2009 19:34 meter ultrasound range |
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use the instumentation amplifier Ad620
it has a gain of 1000 and is a 8 pin IC
though it is costly
Added after 21 minutes:
this IC have the Max gain of 1000 , which is adjustable with only one resistor
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FvM
Joined: 22 Jan 2008
Posts: 5154
Helped: 766
Location: Bochum, Germany
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02 Jul 2009 20:09 ad620 ultrasonic |
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A good suggestion at the wrong place. AD620 has a signal bandwidth of about 10 kHz at G=1000, not particularly suited for ultrasonic, I think. You actually need an amplifier with a higher gain bandwith product to realize G=1000 for e.g. 40 kHz. Using a two stage amplifier is the most simple solution if you depend on easily available standard parts.
Furthermore, there is no use for a differential amplifier in a simple single ended application. An one OP inverted or non-inverted amplifier's gain is also adjustable with only one resistor, by the way.
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hugo
Joined: 01 Jan 1970
Posts: 286
Helped: 27
Location: canada
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02 Jul 2009 22:56 Re: UltraSound Range Meter |
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| binsad wrote: |
Hi,
I was about to start a project "UltraSound Range Meter".
In the receiver section, i was seen that there are 2 stages of amplifiers in order to amplify the received signal to 1000 times. Can i use a single stage amplifier instead of 2 stages???? |
Check this out, it's very simple :
http://www.micro-examples.com/public/microex-navig/doc/090-ultrasonic-ranger.html
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