DL200 Datasheet, PDF (503/670 Pages) Motorola, Inc – Sensor

Freescale Semiconductor, Inc.
AN1571
The oscillation signal varies from person to person. In
general, it varies from less than 1 mmHg to 3 mmHg. From the
transfer function of MPXV5050GP, this will translate to a
voltage output of 12 mV to 36 mV signal. Since the filter gives
an attenuation of 10 dB to the 1 Hz signal, the oscillation signal
becomes 3.8 mV to 11.4 mV respectively. Experiments
indicate that, the amplification factor of the amplifier is chosen
to be 150 so that the amplified oscillation signal is within the
output limit of the amplifier (5 mV to 3.5 V). Figure 3(a) shows
the output from the pressure sensor and Figure 3(b) shows the
extracted oscillation signal at the output of the amplifier.
3
2.5
2
1.5
1
0.5
0
0
3.5
3
2.5
2
1.5
1
0.5
0
10
Oscillation signal is extracted here
5
10
15
20
25
30
35
40
Time (seconds)
Figure 3. CP signal at the output of the pressure sensor
MAP
SBP
DBP
15
20
25
Time (seconds)
30
35
Figure 3b. Extracted oscillation signal at the output of amplifier
Motorola Sensor Device Data _{For Mor}w_eww_In.m_foot_ro_mro_ala_t.c_ioom_n/s_Oem_nic_To_hnd_isuc_Pto_rr_os _duct,
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