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shinekhari
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Join Date: Mar 2009
Posts: 3

Programmable Gain Amplifier (PGA) Software

03/30/2009 7:59 AM

Hi,

I would like to amplify my 0.65 volt sine wave and square wave output from AD9833 to 10 Volts. I need to control the amplitude using software. The bandwidth of the signal is from DC to 2 Mhz. It should amplify atleast signals from DC to 2 Mhz. Could you please help me finding such an amplifier. The amplitude should be controlled in discrete steps. Pls help me

regards

Shine
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Mikerho
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Hobbies - Musician - Engineering Fields - Chemical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jan 2007
Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis)
Posts: 4216
Good Answers: 194
#1

Re: Pls help me finding programmable gain amplifier ( PGA)

03/30/2009 8:35 AM

You are already using an Analog Devices product. They also have PGAs. Check out their website. Check here:

http://www.analog.com/en/amplifiers-and-comparators/variable-gain-amplifiers/products/index.html

Mike

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cnpower
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#2

Re: Programmable Gain Amplifier (PGA) Software

03/30/2009 9:18 PM

How much is steps do you hope to amplify it? you can build it by yourself susing a N to 1 selector with some resistors net.

Your amplification coefficient is only about 12. Its easy for you to select IC. Im afraid LM 358 enough.
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Mikerho
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Hobbies - Musician - Engineering Fields - Chemical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Instrumentation Engineering - New Member

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Good Answers: 194
#3
In reply to #2

Re: Programmable Gain Amplifier (PGA) Software

03/30/2009 9:48 PM

You're right cnpower, this is a fairly low gain - a standard and cheap op-amp will do. If he uses simple digital switching with resistors, he can get several levels of amplification. If he has a uCtrlr however, there are many PGAs that accept digital input for defining the gain. I LOVE THIS STUFF! I should have gone for an EE instead of ChE!

Mike

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shinekhari
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Join Date: Mar 2009
Posts: 3
#4
In reply to #2

Re: Programmable Gain Amplifier (PGA) Software

04/01/2009 12:54 AM

Hi

Thankyou., We decided to use a programmable resistor and suitable OPAMP with 30 GBW..I will let you know if its works..

regards

shine
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