CAN Bus — CANH & CANL Noise Simulation
Data bits
Randomize
Noise type
Gaussian
Spike / EMI
Common-mode
No noise
Amplitude
0.30 V
Show layers
Raw CANH/CANL
Differential
Ideal (clean)
Threshold
CANH (noisy)
CANL (noisy)
Differential (CANH−CANL)
Ideal clean
0.9 V threshold
How CAN rejects noise:
The receiver subtracts CANL from CANH. Common-mode noise appears identically on both wires and cancels out. Only a differential above ~0.9 V is read as dominant (bit 0).