  Wireless all-analog biosensor design for concurrent microfluidic and
physiological signal monitoring is presented in this work. The key component is
an all-analog circuit capable of compressing two analog sources into one analog
signal by Analog Joint Source-Channel Coding (AJSCC). Two circuit designs are
discussed, including the stacked-Voltage Controlled Voltage Source (VCVS)
design with the fixed number of levels, and an improved design, which supports
a flexible number of AJSCC levels. Experimental results are presented on the
wireless biosensor prototype, composed of Printed Circuit Board (PCB)
realizations of the stacked-VCVS design. Furthermore, circuit simulation and
wireless link simulation results are presented on the improved design. Results
indicate that the proposed wireless biosensor is well suited for sensing two
biological signals simultaneously with high accuracy, and can be applied to a
wide variety of low-power and low-cost wireless continuous health monitoring
applications.
