This work presents a power-efficient and noise-efficient amplifier for ECG recordings. To improve power efficiency, all the transistors in the proposed amplifier is designed in sub-threshold region which gives high g\(_m\)/I\(_D\) ratio. To improve noise efficiency, inverter-based differential input stage is used in this proposed operational transconductance amplifier as it reduces noise by a factor of \(\sqrt{2}\) when compared to it’s non-inverter based counterpart. In order to decrease flicker noise, large transistors are used in the input stage. Class A–B structure is used in the output stage for achieving high g\(_m\)/I\(_D\) ratio and for large output swing range. In 180 nm process the amplifier consumes 477 nW DC power from 1.8 V supply which indicates 7.5% decrease in power consumption when compared to recently reported papers. This amplifier achieves a noise efficiency of 2.68. Common mode rejection ratio and power supply rejection ratio is estimated as 98.5 dB and 104.5 dB respectively.

这项工作提出了一种用于ECG记录的高能效和低噪声放大器。为了提高功率效率，建议的放大器中的所有晶体管均设计在亚阈值区域，该阈值区域具有较高的g \（_ m \） / I \（_ D \）比。为了提高噪声效率，在此拟议的跨导放大器中使用了基于反相器的差分输入级，因为与基于非反相器的差分输入级相比，它可以将噪声降低\（\ sqrt {2} \）。为了减少闪烁噪声，在输入级使用了大型晶体管。输出级使用A–B类结构来实现高g \（_ m \） / I \（_ D \）比率和大的输出摆幅范围。在180 nm工艺中，该放大器从1.8 V电源消耗477 nW直流电源，这表明与最近报道的论文相比，功耗降低了7.5％。该放大器的噪声效率为2.68。共模抑制比和电源抑制比分别估计为98.5 dB和104.5 dB。