Low-Noise and High Linearity Potentiostat for Implantable Rumen pH Sensor Using Current Mirror Combined with Chopper Technique

This work presents a low-noise and high linearity potentiostat design used for biomedical implantable rumen pH sensor applications by using current mirror combined with chopper technique. The potentiostat is designed to regulates the potential thought the negative feedback loop. In the design, a folded cascode control amplifier was realized a PMOS-input single stage single-ended op-amp. The control amplifier provided a DC gain over 42.89 dB. The chopper technique was also employed to reduce low-frequency noise and increase system stability. The proposed potentiostat was designed on a standard 0.13 um CMOS process. The was simulated results showed that the potentiometer power consumption less was than 78 μW and generated a sensor current in the range of 44.58-361.82 nA with the varied impedance Z
WE
. These results indicate that this topology is a promising candidate for a low-power implantable biomedical application.