A 790 nWLow-Noise Amplifier for Low Power Biopotentioal Signal Recording Systems

In this paper an ultra-low-power amplifier for biomedical signal recording systems, especially for portable applications such as portable electrocardiogram (ECG) recording systems is presented. In this amplifier current reuse topology is used to achieve a lower input-referred voltage noise power density compared to a normal single-ended amplifier. Supply voltages are ±0.6 V, and the bias currents are 260 nA and 400 nA in the first and the second stages, respectively for reducing the power consumption. the proposed amplifier is simulated using Hspice and 0.18 μm TSMC CMOS technology. It is shown that the power consumotion of the proposed amplifieris as low as 790 nW. This amplifier has an open loop gain of about 100 dB and the total input-referred noise of 5.45μVrms in 7.1 KHz bandwidth and 3.7 μVrms in 200 Hz bandwidth for ECG recording.

Keywords:

Biomedical amplifier , current reusetechnique , low power , low noise