Biomedical Engineering Reference
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Fig. 21 Die photo of the transmitter, receiver, and ADC
is captured by an oscilloscope in place of an ADC and processed by the baseband
algorithm in matlab. The measured receiver sensitivity is
88 dBm, which matches
with theoretical value derived from the noise figure measurement.
In second measurement, as in Fig. 22 , the RF FE is evaluated with a 499.2 MHz
dual ADC and the DBB mapped on FPGA. Due to the digital implementation loss,
the receiver sensitivity is reduced to
82 dBm. Giving the transmitter output power
of
82 dBm sensitivity enables a link
budget of 69 dB. In free space, a wireless link of 16 m can be achieved in principle.
The measurement carried out in the lab shows a link distance of 12 m, which is
approaching the calculated value. With a more complete clock system in the RF FE,
the coherent detection can help to double the link distance to around 30 m.
The overall performance is summarized in Fig. 23 . The proposed IR-UWB system
is 15.4a standard-compliant and is also easy to adapt to other standards. The complete
link works within 6-9 GHz band, and supports a wireless link upto 15 m with
13 dBm and the non-coherent detection, the
13
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