ABSTRACT
A low power reconfigurable sensing amplifier for biomedical applications is proposed. Two cascode voltages in a telescopic amplifier are provided by using only one floating gate and a symmetrically cross self-biasing scheme. Complementary differential pairs and floating-gate techniques are employed to attain low electronic noise and bandwidth reconfigurability with low power consumption. To improve linearity in low frequency operation, gate-balanced pseudo resistors are adopted as feedback resistors. The power efficiency is optimised using a 1.8 V supply voltage with 30 nA current consumption in a 100 Hz bandwidth setting. The measured noise efficiency factor (NEF) is 1.88 with integrated input-referred noise. The dynamic range is above 61.7 dB.
Acknowledgements
This work was supported by the Ministry of Science and Technology in Taiwan under the project numbers of MOST 103-2221-E-011-174- and MOST 104-2221-E-011-118. The fabrication support provided by National Chip Implementation Center, Taiwan, and the Taiwan Semiconductor Manufacturing Company, Taiwan.
Disclosure statement
No potential conflict of interest was reported by the authors.