Hey guys,
Over the past couple of years I have been developing misc. consumer electronics - usually consisting of a microcontroller, some sensors, integrated circuits & daughter boards, and a dc power supply to power everything.
I generally have multiple power rails, for example a 12vdc power adaptor, a 5V and a 3.3V voltage regulator. I have been using the "RECOM R-78E5.0-0.5" a lot, as well as the MCP1700. I also always put decoupling capacitors near the power of each integrated circuit or daughter board (1uF or 0.1uF)
Different device under different circumstances have a different amount of noise on the power rails - sometimes its pretty significant, other times it doesn't matter. I've noticed that this noise still makes it through to a lot of the integrated circuits, sensors, etc. and sometimes causes problems.
What is the correct way to remove this noise so integrated circuits, sensors, etc. operate properly? It seems that decoupling capacitors sometimes are not enough.
I'm confused on if you would build some kind of a filter to go in front of every single integrated circuit/sensor? Can this be done once at the DC power in of the circuit?
How do you decide if it should be a RC filter, LC filter, or something else? I thought these styles of filters were more for signal conditioning and less for actual power conditioning? Is this because a general RC or LC filter is intended for a small amount of current?
Any advice to clear this up would be much appreciated, thanks again!
Over the past couple of years I have been developing misc. consumer electronics - usually consisting of a microcontroller, some sensors, integrated circuits & daughter boards, and a dc power supply to power everything.
I generally have multiple power rails, for example a 12vdc power adaptor, a 5V and a 3.3V voltage regulator. I have been using the "RECOM R-78E5.0-0.5" a lot, as well as the MCP1700. I also always put decoupling capacitors near the power of each integrated circuit or daughter board (1uF or 0.1uF)
Different device under different circumstances have a different amount of noise on the power rails - sometimes its pretty significant, other times it doesn't matter. I've noticed that this noise still makes it through to a lot of the integrated circuits, sensors, etc. and sometimes causes problems.
What is the correct way to remove this noise so integrated circuits, sensors, etc. operate properly? It seems that decoupling capacitors sometimes are not enough.
I'm confused on if you would build some kind of a filter to go in front of every single integrated circuit/sensor? Can this be done once at the DC power in of the circuit?
How do you decide if it should be a RC filter, LC filter, or something else? I thought these styles of filters were more for signal conditioning and less for actual power conditioning? Is this because a general RC or LC filter is intended for a small amount of current?
Any advice to clear this up would be much appreciated, thanks again!