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Thread: Voltage Amplifier
face picon face BY : Olin Lathrop email (remove spam text)

> I want to use an amplifier for my ultrasonic receiver. the output of my
> ultrasonic receiver is very small (few mV) at 40 kHz that i want to
> the signal to around 2-5 Volts. I have tried using simple design of
> operational amplifier, the inverting and non-inverting op-amp, but i could
> not get the output.

So you want a gain of about 1000 starting at a few millivolts with around
100KHz bandwidth.  By the way, a few mV is not very small.  It is well large
enough to allow such amplification without introducing much noise.
Microphones often put out in the microvolts range.

A gain of 1000 if a bit much for a single stage.  I would use two stages
each with a gain around 30.  That means you need amps with gain*bandwidth of
somewhat over 3M, which isn't that hard to find.  Two stages also allows for
high pass filtering between the stages to eliminate DC offsets from the
first stage.

Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olinspamembedinc.com, http://www.embedinc.com

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