A low power, low noise neural amplifier, using bulk-driven cascode current mirror load

Multi-channel neural recording amplification and receiving systems are an inseparable component in the treatment and investigation process of human nervous system. Due to the low amplitude of neural signal range and high number of neural recording channels, these systems should have low noise and low power consumption. In this work, a new telescopic transconductance operational amplifier is presented using the current source launched via the body (bulk-driven cascade current mirror (BDCCM)). The output swing of this amplifier has a considerable increase compared to the other telescopic transconductance amplifiers. The neural amplifier designed by the proposed transconductance amplifier has a high output swing as well as low noise efficiency factor, noise, and power consumption. The proposed amplifier has a power consumption of 6.9 μw, effective input noise of 2.45 μV/√hz, noise efficiency factor of 2.2, and gain of 38.9 dB in bandwidth of 0.089Hz-7kHz. This amplifier is simulated in the 180 nm MOSFET process; its output swing and power supply voltages are 0.7v and ±0.9v, respectively.