Hi
I know that you have 2 stage op amps and thats so you can get a high gain (30 x 30 - or whatever the gain of each op amp is) but why does the gain have to be so high? If you have a comparator comparing these resultant voltage cant it just be compared with another small voltage (from a pic or whatever) and the result be obtained to give a view of distance.
I know its a such a noob question but i dont see why? I dont know what kind of decisions have to be made and why when choosing the gain of the op amp in the ultrasound circuit?
Thanks for any help.
I know that you have 2 stage op amps and thats so you can get a high gain (30 x 30 - or whatever the gain of each op amp is) but why does the gain have to be so high? If you have a comparator comparing these resultant voltage cant it just be compared with another small voltage (from a pic or whatever) and the result be obtained to give a view of distance.
I know its a such a noob question but i dont see why? I dont know what kind of decisions have to be made and why when choosing the gain of the op amp in the ultrasound circuit?
Thanks for any help.