Regardless of the option, input referred noise also impacts overall angle accuracy. As the input SNR ratio
varies, the resulting peak noise induced angle error approximately follows the trend in
. For any sensor used, the required input signal can be calculated based on the angle accuracy
requirement.
SNR (dB)
A
ngle E
rror (d
eg)
8
14
20
26
32
38
44
50
56
62
68 72
0.02
0.03
0.05
0.1
0.2
0.3
0.5
1
2
3
5
10
20
30
50
100
180
Figure 2-19. Noise Induced Angle Error
2.3.6 Layout for Sensor Location
One important factor when designing an angle encoder using these devices is the actual sensor location on the
PCB. The sensor placement in the package may result with unintentional placement errors in any of the 3 axes.
Figure 2-20. TIDA-060040 Sensor Placement
System Overview
14
Absolute Angle Encoder Reference Design With Hall-Effect Sensors for
Precise Motor Position Control
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