A low power sensor read-out circuit has been implemented in
0.35 µm CMOS technology that
consumes only 400 µW of power
and occupies an area of 0.66 mm2. The circuit is capable of converting the current signal from any generic biosensor into an
amplitude shift keying (ASK) signal. The on-chip potentiostat biases the chemical sensor
electrodes to create the sensor current which is then integrated and buffered to generate a
square wave with a frequency proportional to the sensor current level. A programmable
frequency divider is incorporated to fix the ASK envelope frequency to be inbetween
20 Hz and 20 kHz, which is within the audible range of human hearing. The entire
transmitter block operates with a supply voltage as low as 1.5 V, and it can be
easily powered up by an external RF source. Test results emulate the simulation
results with good agreement and corroborate the efficacy of the designed system.
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