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my estimation that with op07 you can get 20-30 nA resolution
I made simulation with op07 model it gave something like 15 nA current
noise floor, but it is 'ideal" condition...
Op07 much-much better then LM324 but still....
When you begin to build this circuit beware about very low noise Vcc...
transimpedance amplifier with lm324
With LM324 you never can not get output swing close to your VCC
It is "strong" not rail-to-rail.
If you can not obtain any rail-to-rail amplifier - the only way is or add negative supply or try to add push-pull transistor stage to output amp in the schematic...
For > 2.5G BGA is the only conventional solution.
Pins of any kind of SMT package is too long, and internal
wirebonding make a lot of problems too.
BGA give the shortest way from silicon to PCB line
photodiode preamplifier
BTW
A short calculation (see page 11 of datasheet) show,
that your design target not achievable even with this OA
Maximum 0.75 Mohm for 2MHz band
And most critical parameter will be photodiode capacitance
and layout parasitic of course ....
So try to think about...
photo diode preamplifier circuit
No one of "standard" OA not applicable for your design
you never get 2 M band with 2 Meg resistor (your parasitic capacitance
must be not more then 3*10^ -14 = 30 femtofarade !!!)
The only solution is - to use "RF" OA with very high bandwidth product, like...
motor spikes
As a rule you receive spikes via your ground line
Optocoupler will not help if you have the same gnd
for power driver and your control unit
Try to use optocouplers for in/out + floating power supply placed close to uC
it will work for sure.
try to connect two gnd's via 0.1u...
1. Attached pdf will explain all about dB
2. Take in account that for acoustic measurements you must to use
weight filter (A- curve, for example) that have frequency response
inverse to human ear
2. Log calculation may be too heavy for small processor,
so better to use hardware conversion - log...
Re: do you know a mosfet with smaller than 0,05Ohm resistanc
1. If your apllication is "cost sensitive" - think about 2-4 parallel cheapest
mosfets, it is not so elegant, but work.
2. If you have such option, try to use bootstraping (Vgate>>Vdrain)
it will help for sure.
Re: What is Transponder?
**broken link removed**
http://www.digitalangelcorp.com/
http://www.righttag.com/products.html
http://www.rfidjournal.com/article/articleview/208#Anchor-9024
Transponder: A radio transmitter-receiver that is activated
when it receives a predetermined signal. RFID...
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