Zaaappp
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[semi-n00b question here, so pls be nice ]
Consider a simple, audio-effects box used in a professional recording studio:
The circuit will have several controllers and processors running clocks at MHz speeds. (Assume I do all the correct things in layout, e.g. ground plane between noisy clocks, supplies buffered, etc.)
Is there any reason to keep the signals balanced on the pcb traces themselves?
Meaning differential, two signal traces referenced to circuit gnd per signal (versus just one signal line referenced to gnd).
What I'm unclear about is if things like, say, the common-mode rejection effect would even be a factor when things like micro-strip cross talk and injected noise (from adjacent circuits) could be a bigger issue? … said another way, would I be shooting myself in the foot to use balanced signals on the board when unbalanced (but clean) signals would work just as well?
- My (overly-optimistic?) Ideal specs :laugh:
Thanks for the assistance!
- Howard in Florida
{edaboard rocks, the others merely flubber}
______________________________________
References:
https://en.wikipedia.org/wiki/Microstrip
https://www.skottanselektronik.com
Consider a simple, audio-effects box used in a professional recording studio:
- An audio in, two-layer pcb's doing both analog and digital processing, then audio out.
- Both in and out are balanced, line-levels, commonly used in sound gear.
- The audio must be the highest possible quality.
The circuit will have several controllers and processors running clocks at MHz speeds. (Assume I do all the correct things in layout, e.g. ground plane between noisy clocks, supplies buffered, etc.)
Is there any reason to keep the signals balanced on the pcb traces themselves?
Meaning differential, two signal traces referenced to circuit gnd per signal (versus just one signal line referenced to gnd).
What I'm unclear about is if things like, say, the common-mode rejection effect would even be a factor when things like micro-strip cross talk and injected noise (from adjacent circuits) could be a bigger issue? … said another way, would I be shooting myself in the foot to use balanced signals on the board when unbalanced (but clean) signals would work just as well?
- My (overly-optimistic?) Ideal specs :laugh:
- SNR (Signal to Noise Ratio): -70 dB (Audio Level) to -75 dB(AL) … that's around a 24-bit master.
- Headroom: about 10 dB(AL) max
- Frequency response: 10Hz to 25kHz
Thanks for the assistance!
- Howard in Florida
{edaboard rocks, the others merely flubber}
______________________________________
References:
https://en.wikipedia.org/wiki/Microstrip
https://www.skottanselektronik.com
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