论文标题
电容反馈变速器放大器的频率响应分析和设计规则
Frequency Response Analysis and Design Rules for Capacitive Feedback Transimpedance Amplifier
论文作者
论文摘要
精密仪器系统（例如光接收机和其他当前输出测量系统）通常包含变速器放大器（TIA）。常用的电阻反馈TIA（RF-TIA）在其实际实施方面有缺点。系统带宽受到反馈电阻及其在高速应用中的寄生电容的限制。为了克服这一缺点，可以使用电容反馈TIA（CF-TIA）。 CF-TIA的增益和带宽性能在理论上等同于RF-TIA的增益和带宽。尽管在先前的研究中引入了CF-TIA，以减少热噪声并解决与CMOS技术相结合的难度，但过去的分析尚未足够深入。这项研究的最终目标是为该领域的设计师提供有用的设计规则和分析工具。特别是，提出了传输函数模型，关键设计参数和稳定性分析。此外，引入了一种涉及简化集成器DC反馈回路的新的CF-TIA配置，可以将其部署为单个阶段而不是传统的两阶段拓扑。尽管本研究中考虑的应用是具有高输入电容的高速传感器测量和设备，例如激光位置检测器，但此处获得的分析结果也适用于其他多种应用，例如新兴的生物传感器和光学通信系统。
Precision instrumentation systems, such as optical receivers and other current-output measurement systems, often contain a transimpedance amplifier (TIA). The commonly used resistive feedback TIA (RF-TIA) has a drawback in its practical implementation; the system bandwidth is limited by the feedback resistor and its parasitic capacitance in high-speed applications. To overcome this drawback, a capacitive feedback TIA (CF-TIA) can be used. The gain and bandwidth performance of the CF-TIA are theoretically equivalent to those of the RF-TIA. Although CF-TIA has been introduced in previous studies for reducing thermal noise and addressing the difficulty in integrating a high resistance with CMOS technology, past analyses have not been in sufficient depth. The ultimate goal of this study is providing designers in this field with helpful design rules and analytical tools. In particular, a transfer function model, the critical design parameters, and a stability analysis are presented. Furthermore, a new CF-TIA configuration involving a simplified integrator DC feedback loop is introduced, which can be deployed as a single stage rather than the conventional two-stage topology. While the applications considered in this study were high-speed sensor measurements and devices with a high input capacitance, such as a laser position detector, the analytical results obtained herein also applicable to a variety of other applications such as emerging biosensors and optical communication system.
