Hi all!
I'm designing a basic op-amp circuit and am trying to be really careful with noise. I'm not sure if I went too crazy with decoupling networks though.
I've attached the circuit diagram I whipped up in LTspice. I haven't calculated any of values yet, but I thought I would post the big picture to see if I'm getting the idea right in terms of decoupling the supply from the circuit, the circuit from the output etc. Hopefully I'm attenuating any parasitic inductance/capacitance in my circuit. Or maybe I mucked something up. That's why I'm posting!
I've also been following this guide on decoupling: http://www.designers-guide.org/Design/bypassing.pdf
The general specs are as follows:
It's going to end up being a PCB
Frequency range: 9 kHz-50 MHz
Power supply for op-amp: 5V
Signal to be amplified: approx 70.7uV
Minimum gain needed: 3.3 or about 5.18 dB
Not sure if I can get away with a single bypass ceramic cap of .1 uF and have the damping circuit reduce any ringing. Or I could perhaps use a 22 uF electrolytic in parallel with a .1 uF ceramic. Might be interesting to do both and compare.
Any feedback would be great! Thanks so much!
I'm designing a basic op-amp circuit and am trying to be really careful with noise. I'm not sure if I went too crazy with decoupling networks though.
I've attached the circuit diagram I whipped up in LTspice. I haven't calculated any of values yet, but I thought I would post the big picture to see if I'm getting the idea right in terms of decoupling the supply from the circuit, the circuit from the output etc. Hopefully I'm attenuating any parasitic inductance/capacitance in my circuit. Or maybe I mucked something up. That's why I'm posting!
I've also been following this guide on decoupling: http://www.designers-guide.org/Design/bypassing.pdf
The general specs are as follows:
It's going to end up being a PCB
Frequency range: 9 kHz-50 MHz
Power supply for op-amp: 5V
Signal to be amplified: approx 70.7uV
Minimum gain needed: 3.3 or about 5.18 dB
Not sure if I can get away with a single bypass ceramic cap of .1 uF and have the damping circuit reduce any ringing. Or I could perhaps use a 22 uF electrolytic in parallel with a .1 uF ceramic. Might be interesting to do both and compare.
Any feedback would be great! Thanks so much!
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