IEEE Trans Biomed Circuits Syst. 2011 Jun;5(3):253-61. doi: 10.1109/TBCAS.2010.2104320.
This paper presents a low-noise front-end amplifier with configurable gain, targeting the recording of small signals, such as the electrocardiogram (ECG) or electroneurogram (ENG). The circuit consists of a continuous-time input stage using lateral bipolar transistors realized in complementary metal-oxide semiconductor (CMOS) technology followed by a switched-capacitor integrating stage. The voltage gain is adjustable by varying the phase delay between two system clocks. Simulated and measured results for a chip fabricated in 0.35-μm CMOS technology are reported. The amplifier occupies an active area of 0.064 mm(2), yields a nominal gain of 630 V/V with more than a 50-dB tuning range, less than 16 nVrms/√Hz input noise and a common-mode rejection of more than 97 dB. Its power consumption is 280 μW with a ±1.5-V supply.
本文提出了一种具有可配置增益的低噪声前端放大器，旨在记录小信号，如心电图 (ECG) 或神经电图 (ENG)。该电路由连续时间输入级组成，使用横向双极晶体管在互补金属氧化物半导体 (CMOS) 技术中实现，其后是开关电容积分级。通过改变两个系统时钟之间的相位延迟，可以调节电压增益。报道了采用 0.35μm CMOS 技术制造的芯片的模拟和测量结果。该放大器占用的有效面积为 0.064mm²，在超过 50dB 的调谐范围内提供标称增益为 630V/V，输入噪声小于 16nVrms/√Hz，共模抑制比大于 97dB。其功耗为 280μW，采用 ±1.5V 电源供电。
