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首页> 外文期刊>Biomedical Circuits and Systems, IEEE Transactions on >CMOS Optoelectronic Lock-In Amplifier With Integrated Phototransistor Array
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CMOS Optoelectronic Lock-In Amplifier With Integrated Phototransistor Array

机译：具有集成光电晶体管阵列的CMOS光电锁定放大器

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摘要

We describe the design and development of an optoelectronic lock-in amplifier (LIA) for optical sensing and spectroscopy applications. The prototype amplifier is fabricated using Taiwan Semiconductor Manufacturing Co. complementary metal–oxide semiconductor 0.35-$mu$ m technology and uses a phototransistor array (total active area is 400 $mu{hbox {m}}times {hbox {640}} mu$m) to convert the incident optical signals into electrical currents. The photocurrents are then converted into voltage signals using a transimpedance amplifier for subsequent convenient signal processing by the LIA circuitry. The LIA is optimized to be operational at 20-kHz modulation frequency but is operational in the frequency range from 13 kHz to 25 kHz. The system is tested with a light-emitting diode (LED) as the light source. The noise and signal distortions are suppressed with filters and a phase-locked loop (PLL) implemented in the LIA. The output dc voltage of the LIA is proportional to the incident optical power. The minimum measured dynamic reserve and sensitivity are 1.31 dB and 34 ${hbox {mV}}/mu{hbox {W}}$, respectively. The output versus input relationship has shown good linearity. The LIA consumes an average power of 12.79 mW with a 3.3-V dc power supply.
机译：我们描述了用于光学传感和光谱学应用的光电锁定放大器（LIA）的设计和开发。原型放大器使用台湾半导体制造公司的互补金属氧化物半导体0.35- $ mu $ m技术制造，并使用光电晶体管阵列（总有效面积为400 $ mu {hbox {m}}倍{hbox {640}} mu $ m）将入射的光信号转换成电流。然后，使用跨阻放大器将光电流转换为电压信号，以便随后通过LIA电路方便地进行信号处理。 LIA已优化为可在20 kHz调制频率下运行，但可在13 kHz至25 kHz的频率范围内运行。该系统使用发光二极管（LED）作为光源进行了测试。 LIA中实现的滤波器和锁相环（PLL）抑制了噪声和信号失真。 LIA的输出直流电压与入射光功率成正比。最小测得的动态储备和灵敏度分别为1.31 dB和34 $ {hbox {mV}} / mu {hbox {W}} $。输出与输入的关系显示出良好的线性。 LIA使用3.3V直流电源时，平均功耗为12.79 mW。

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