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Title Temperature-insensitive Pseudo-resistor
Authors (Jong Pal Kim)
Page pp.47-51
ISSN 1598-1657
Keywords Pseudo-resistor; temperature; sensitivity; compensation; amplifier
Abstract A novel pseudo-resistor insensitive to temperature change is proposed. In order for the pseudo-resistor implemented in the previous capacitively coupled instrumentation amplifier (CCIA) or transimpedance amplifier (TIA) to be used in the industrial temperature range (-40 ℃ to 85 ℃), it is necessary to develop a pseudo resistor insensitive to temperature change. The new pseudo-resistor can adjust the resistance value and the temperature sensitivity can be tuned. The pseudo-resistor is implemented using two PMOSs connected in series and a gate bias control block. A current proportional to the absolute temperature is used to control the magnitude of the pseudo-resistance and its temperature sensitivity. It was designed and laid out based on the 0.18 μm CMOS process, and as a result of simulation, it was possible to adjust the resistance value between 1.7 GΩ and 10.4 GΩ. The temperature sensitivity of the pseudo-resistor was able to obtain a minimum value of 91 ppm/℃ in the range of -40 ℃ to 85 ℃.