Hello...
Am undergraduate EE, and am working on my final year project which is the development of prosthetic arm which will work on signal from muscles taken from surface myoelectric sensors.
First of all i will explain about circuits i want to build, and i wish i will have comments which will help me to complete my project successfully.
My first goal is to take the EMG signals from muscles and make an amplification and filter circuit. So i did some research and designed this circuit, using instrumentation amplifier, and TLC2274 for filtering circuits and second stage amplifier.
I attached the circuit in the PDF file. I have some questions concerning the circuit i attached:
1- I put the V+, and V- pins in AD620 to +-5 respectively, and the reference pin to 0v, and i made the gain of this stage to 5. So am not sure if the reference pin should be connected to 0v or to any other voltage?!
2-After i have designed the low pass(450HZ cut off frequency) and high pass filter(20HZ cut off frequency) using butterworth and sallen key, i added a second stage amplifier with gain 200, so i will have a total gain 5*200=1000. Also i make an offset of 2.5 v at this stage in order to allow this signal to enter the Analog to Digital Converter which am planing to use(ADS8325).. Is there any problem in my desing and do i have to take any other things into consideration for this circuit?
After this circuit works am planning to enter the data to a DSP, but still have low information about what DSP i have to use for such application, Please any help concerning the DSP type and DSP tutorials.
Thank you very much. Hisham
