A low power readout circuit approach for uncooled resistive microbolometer FPAs
2008
This paper presents a new, low power readout circuit approach for uncooled resistive microbolometer FPAs. The
readout circuits of the microbolometer detectors contain parallel readout channels whose outputs are driven and
multiplexed on large bus capacitances in order to form the output of the readout circuit. High number of opamps used in
the readout channel array and large output capacitances that these opamps should drive necessitates the use of high
output current capacity structures, which results in large power dissipation. This paper proposes two new methods in
order to decrease the power dissipation of the readout circuits for uncooled thermal FPAs. The first method is called the
readout channel group concept, where the readout channel array is separated into groups in order to decrease the load
capacitance seen by the readout channel output. The second method utilizes a special opamp architecture where the
output current driving capacity can be digitally controlled. This method enables efficient use of power by activating the
high output current driving capacity only during the output multiplexing. The simulations show that using these
methods results in a power dissipation reduction of 80% and 91% for the readout channels optimized for a single output
384x288 FPA operating at 25 fps and for a two-output 640x480 FPA operating at 30 fps, respectively.
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