标题: | 一个10 Gbps,高动态范围之CMOS光通讯接收机 A 10 Gbps, Wide Dynamic Range CMOS Optical Receiver |
作者: | 赖圣华 Lai, Sheng-Hua 陈巍仁 Chen, Wei-Zen 电子工程学系 电子研究所 |
关键字: | 光纤通讯;optical communication |
公开日期: | 2014 |
摘要: | 本论文提出一个使用联电(UMC)四十奈米CMOS制程实现之光通讯接收机。其具备每秒一百亿位元(10Gb/s)的资料传输速度及15 dB之接收信号动态范围, 且具备低功率消耗之优点,为现有文献及技术报告中最佳者。 本晶片中整合了一个前端的转阻放大器(Transimpedance Amplifier, TIA)、后级限幅放大器(Post-limiting amplifier)及自动增益控制(Auto gain control, AGC)电路。典型之转阻放大器采用并联回授式架构,其在接收端输入大光电流的条件下,将造成输出信号之饱和失真。此一问题虽可藉由降低回授电阻值来解决,然而其往往造成系统之开回路主极点上升,导致相位边限之劣化并产生稳定度之问题。 为克服上述困难,本设计利用自动增益控制器动态调整转阻放大器之回授电阻值及核心电压放大器之增益,使接收机前级电路在不同增益模态下达到稳定之开回路增益及相位边限,进而达到宽动态范围操作并提升系统之稳定度。 本电路操作于 1.2伏特电压之下,资料传输之能源效益达到 3.6 pJ/bit。在误码率(BER)皆小于〖10〗^(-12) 之条件下,接收机之灵敏度达到 -15 dBm。 晶片面积为0.334平方毫米。 This thesis describes the design of a 10 Gbps, 15 dB dynamic range optical receiver in UMC 40 nm CMOS process. It also has the advantage of low power consumption, and has the best performance in terms of dynamic range at 10 Gbps operation. The optical receiver consists of a transimpedance amplifier, a post limiting amplifier and an automatic gain controlled circuit. Typically, a shunt-shunt feedback amplifier is utilized in transimpedance amplifier (TIA) design. However, under the circumstance of large input photo current, it may result in output signal distortion. Although this problem can be circumvented by reducing the feedback resistor of TIA, it may induce a higher open loop dominant pole of TIA. Thus the phase margin will be degraded and may cause stability issue. To overcome the aforementioned problem, an automatic gain controlled circuit which dynamically adjusts the feedback resistor and voltage gain of TIA core amplifier is adopted in this design. It stabilizes the open loop gain of TIA and phase margin, so as to improve system stability under wide dynamic range operation. The experimental prototype is operated under 1.2 V supply, and achieves an energy efficiency of 3.6 pJ/bit. For bit error rate of less than 10-12, the input sensitivity is -15 dB. Chip size is 0.334 mm2. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070150258 http://hdl.handle.net/11536/125566 |
显示于类别: | Thesis |