I am looking for opinions on grounding techniques, particularly in
automotive circuits. I have designed a circuit that uses both digital and
analogue circuits and I was planning to connect these grounds at a single
point to attempt to keep digital noise away form the analogue section. I am
also using a switch mode power supply operating at 300KHz so I was thinking
of using a common mode choke on the input to help EMC. I was wondering the
best way to connect this, I am a bit confused......
I connect positive and ground to one side of the choke so on the other side
I will have a filtered positive and a filtered ground. Does this then give
me a 3rd ground? I was thinking about connecting the unfiltered ground to
the Chassis and running a ring around the outside of my PCB on both layers.
I was then going to connect the digital ground the filtered output after the
choke and connect the analogue ground like described above Some circuits I
have seen appear to have the ground connected together before and after the
choke so I cant see what the pint is of filtering the ground in the first
place in that example..
I hope I have been clear on what it is that I am trying to do and really
appreciate any feedback
Common Mode choke and grounding ...analogue circuits and I was planning to connect these grounds at a single ... point to attempt to keep digital noise away form the analogue section. ... I connect positive and ground to one side of the choke so on the other side ... choke so I cant see what the pint is of filtering the ground in the first ... (sci.electronics.design)
Re: Common Mode choke and grounding ...analogue circuits and I was planning to connect these grounds at a single ... point to attempt to keep digital noise away form the analogue section. ... of using a common mode choke on the input to help EMC. ... choke so I cant see what the pint is of filtering the ground in the first ... (sci.electronics.design)
Re: Common Mode choke and grounding ... point to attempt to keep digital noise away form the analogue section. ... I connect positive and ground to one side of the choke so on the other side ... I was then going to connect the digital ground the filtered output after the choke and connect the analogue ground like described above Some circuits I have seen appear to have the ground connected together before and after the choke so I cant see what the pint is of filtering the ground in the first place in that example.. ... If the DC currents are significant, or the circuit has large DC sensitivities, include resistance in each connection, so you can think about where the DC drops will be, also. ... (sci.electronics.design)
Re: Common mode chokes and grounding ...filter caps like 0.01uf to each of the electronic sections. ... its impossible to remove the ringing from the analog circuits due to RF from ... Always use a liner for analog if possible. ... > of using a common mode choke on the input to help EMC. ... (sci.electronics)
Re: Lenny Henrys Head next on the block] ...michael adams wrote: ...circuits as it merely involves addition. ... That's an analogue system.... And multiplications are easily performed by addition in binary ... (uk.media.tv.misc)
