0
500
1000
1500
2000
2500
3000
3500
-6
-4
.2
-2
.4
-0
.6
1
.2
3
4
.8
6
.6
8
.4
1
0
.2
1
2
Occu
rr
e
n
ce
s
Input-Referred Noise (µV)
C006
VDDIO = 3.3 V
-15
-10
-5
0
5
10
15
0
1
2
3
4
5
6
7
8
9
10
In
p
u
t-
Ref
e
rr
e
d
Noise
(
µ
V
)
Time (s)
C004
VDDIO = 3.3 V
www.ti.com
Test Data and Simulation Results
6
Test Data and Simulation Results
6.1
Antenna Simulations
The following data was simulated using the High-Frequency Structural Simulator (HFSS) from ANSYS
(
www.ansys.com
).
The goal of the antenna simulations was to validate that the 2.45-GHz antenna performed as expected.
Figure 29. Antenna Simulation
6.2
Noise Test Results
Figure 30
and
Figure 31
show the input referred noise of the AFE.
Figure 30. Input-Referred Noise
Figure 31. Noise Histogram
23
TIDU195A – January 2014 – Revised July 2014
Wireless Heart Rate Monitor Reference Design
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