Post History
I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors a...
#4: Post edited
by
Lorenzo Donati
·
2023-08-10T12:13:25Z (over 1 year ago)
Retagged.
#3: Post edited
by
Olin Lathrop
·
2020-08-21T23:06:13Z (over 4 years ago)
- I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors among other things. The digital side does not have high-frequency communications - PWM at 25kHz, and a Two-Wire bus at a couple of hundreds of kHzs.
- Here is my stackup:
- 1 - Signal
- 2 - GND
- 3 - PWR
- 4 - Signal
What is best practice when routing a design like this? Right now I am routing traces from both the analog and digital components on the top layer and moving to the bottom only when I run out of room. Is this correct, or should I use the top layer for analog only and the bottom for digital only, or vice versa?Thanks.
- I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors among other things. The digital side does not have high-frequency communications - PWM at 25kHz, and a Two-Wire bus at a couple of hundreds of kHzs.
- Here is my stackup:
- 1 - Signal
- 2 - GND
- 3 - PWR
- 4 - Signal
- What is best practice when routing a design like this? Right now I am routing traces from both the analog and digital components on the top layer and moving to the bottom only when I run out of room. Is this correct, or should I use the top layer for analog only and the bottom for digital only, or vice versa?
#2: Post edited
by
Olin Lathrop
·
2020-08-21T22:37:50Z (over 4 years ago)
Deleted greeting. This isn't a kafeeklatsch.
Hello, all!- I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors among other things. The digital side does not have high-frequency communications - PWM at 25kHz, and a Two-Wire bus at a couple of hundreds of kHzs.
- Here is my stackup:
- 1 - Signal
- 2 - GND
- 3 - PWR
- 4 - Signal
- What is best practice when routing a design like this? Right now I am routing traces from both the analog and digital components on the top layer and moving to the bottom only when I run out of room. Is this correct, or should I use the top layer for analog only and the bottom for digital only, or vice versa?
- Thanks.
- I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors among other things. The digital side does not have high-frequency communications - PWM at 25kHz, and a Two-Wire bus at a couple of hundreds of kHzs.
- Here is my stackup:
- 1 - Signal
- 2 - GND
- 3 - PWR
- 4 - Signal
- What is best practice when routing a design like this? Right now I am routing traces from both the analog and digital components on the top layer and moving to the bottom only when I run out of room. Is this correct, or should I use the top layer for analog only and the bottom for digital only, or vice versa?
- Thanks.
#1: Initial revision
by
jm567
·
2020-08-21T19:45:58Z (over 4 years ago)
4-Layer PCB Routing Question
Hello, all! I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors among other things. The digital side does not have high-frequency communications - PWM at 25kHz, and a Two-Wire bus at a couple of hundreds of kHzs. Here is my stackup: 1 - Signal 2 - GND 3 - PWR 4 - Signal What is best practice when routing a design like this? Right now I am routing traces from both the analog and digital components on the top layer and moving to the bottom only when I run out of room. Is this correct, or should I use the top layer for analog only and the bottom for digital only, or vice versa? Thanks.