1Gb/s CMOS调节型共源共栅光接收机

基于特许0.35μm EEPROM CMOS标准工艺设计了一种单片集成光接收机芯片,集成了双光电探测器(DPD)、调节型共源共栅(RGC)跨阻前置放大器(TIA)、三级限幅放大器(LA,limiting amplifier)和输出电路,其中RGCTIA能够隔离光电二极管的电容影响,并可以有效地扩展光接收机的带宽。测试结果表明,光接收机的3dB带宽为821MHz,在误码率为10-9、灵敏度为-11dBm的条件下,光接收机的数据传输速率达到了1Gb/s;在3.3V电压下工作,芯片的功耗为54mW。     

A 3.125-Gb/s inductroless transimpedance amplifier for optical communication in 0.35μm CMOS Xu Hui(徐晖), Feng Jun(冯军), Liu Quan(刘全), Li Wei(李伟)

采用0.35μm CMOS工艺设计了一种适用于光通信的低功耗前置放大器,芯片最高工作速率可达3.125Gb/s。该前置放大器采用RGC (Regulated Cascode)结构作为输入级,同时引入消直流电路来稳定电路的直流工作点。在片测试结果表明,前置放大器的跨阻增益为54.2dBΩ,-3dB带宽为2.31GHz,平均等效输入噪声电流谱密度为18.8pA/?Hz;输入为2.5Gb/s和3.125Gb/s信号时均可获得清晰眼图;3.3V单电源供电时,功耗仅为58.08mW,其中20mW来自输出缓冲。芯片面积为465μm435μm。     

0.35μm CMOS 2.5Gb/s宽动态范围前置放大器设计

采用Chartered 0.35μm CMOS工艺设计了一种适用于光纤传输系统STM-16(2.5Gb/s)速率级的低功耗、宽动态范围的前置放大器.该前置放大器采用RGC(Regulated Cascode)结构作为输入级,同时引入消直流电路来提高光电流的过载能力.仿真结果表明,前置放大器的跨阻增益为57.0dBΩ,-3dB带宽为2.003GHz;当误码率BER为10~(-12)时,输入灵敏度为-23.0dBm,过载光电流达到800 μ A.3.3V单电源供电时,功耗仅为59.43mW.芯片面积为465 μm × 435 μm.     

10Gb/s0.18μm CMOS光接收机前置放大器

采用TSMC0．18μm CMOS工艺,设计应用于SDH系统STM-64速率级（10 Gbit／s）光接收机前置放大器,该前置放大器采用具有低输入阻抗、宽带宽特点的RGC形式的跨阻放大器实现,同时在电路中引入有源电感实现并联峰化技术,以拓展前置放大器的带宽。整个电路采用1．8V单电压源供电。仿真结果表明：中频互阻增益为59.2dBΩ,-3dB带宽为9．08GHz．     

A 3.125-Gb/s inductorless transimpedance amplifier for optical communication in 0.35μm CMOS

A 3.125-Gb/s transimpedance amplifier(TIA) for an optical communication system is realized in 0.35μm CMOS technology.The proposed TIA employs a regulated cascode configuration as the input stage, and adopts DC-cancellation techniques to stabilize the DC operating point.In addition,noise optimization is processed. The on-wafer measurement results show the transimpedance gain of 54.2 dBΩand -3 dB bandwidth of 2.31 GHz.The measured average input referred noise current spectral density is about 18.8 pA/(?).The measured eye diagram is clear and symmetrical for 2.5-Gb/s and 3.125-Gb/s PRBS.Under a single 3.3-V supply voltage,the TIA consumes only 58.08 mW,including 20 mW from the output buffer.The whole die area is 465×435μm~2.     

用于平衡探测器的5Gb/s前置放大器设计

相干光通信的平衡探测器采用双端差分结构,能够有效地提高光通信灵敏度。前置放大器作为光接收器的前端,其性能高低直接影响到整个光接收系统的工作性能,是光接收器的重要组成部分。文章采用SMIC 0.13μm CMOS工艺,实现了一种应用于5Gb/s平衡探测器的接收机前置放大器。前置放大器采用具有低输入阻抗特点的RGC结构作输入级,同时输出级采用两级结构,在保证带宽的前提下能够提供足够大的电流驱动50Ω负载。仿真结果表明,该前置放大器带宽能达到要求的5.12GHz,灵敏度达到-18.4dBm,眼图张开度良好,能够满足系统对噪声抑制的要求。     

一种锁相环中高性能电荷泵电路

设计了一种新型电荷泵电路.该电荷泵电路采用可调节共源共栅结构增大输出阻抗,具有结构简单、速度快、充放电电流匹配性好、抑制了电荷注入等特点.采用0.18μmCMOS工艺模型以及Hspice仿真工具的仿真结果显示,输出电压在0.4~1.3V之间变化时,电荷泵的充放电电流处处相等.     

一种跨阻放大器的设计

文章提出了一种基于调节型共源共栅电路结构（RGC）的跨阻放大器,采用0.5μm的标准互补型金属氧化物半导体（CMOS）工艺进行设计,仿真。测试结果表明,该电路具有69.93dB的跨阻增益,830MHz的-3dB带宽。在输入电流为1μA时,其输出电压的动态摆幅达到4.5mV,在5V电源电压下功耗仅为63.16mW。     

Photoelectrochemical TiO2-Au-Nanowire-Based Motor for Precise Modulation of Single-Neuron Activities

Micro/nanomotors are revolutionary miniaturized robotic systems capable of converting diverse energy sources, including light, ultrasound, and thermal heat, into mechanical motion. This fascinating research area is emerging and developing at a rapid pace, demonstrating potential in multiple fields. While their locomotion and momentum capabilities have been explored in medical treatments, including microsurgery and diagnosis, the aspect of converting their intrinsic energies into usable forms remains unexplored. Here, we proposed a novel motor based on composite TiO₂-Au nanowires (NWs), powered by a local electric field generated from ultra-low ultraviolet (UV) irradiation, to serve as an interactive bioelectric interface with a neural cell. Under a light field, the NW motor achieved highly controllable motion in biological environments and reached the targeted neuronal retinal ganglion cells (RGCs) with notable precision. Next, the locally generated electric field was utilized as an electrical stimulus to activate the targeted cell through the calcium ion channel. This is the first study to report on the photoelectric conversion capabilities of a motor being used to provide propulsion force and interactive cues in a biosystem. This motor-based strategy represents a new approach for the precise and non-invasive delivery of bioelectrical signals and neuronal activity modulation.     

CMOS光接收机前端放大电路

利用SMIC 0.18μmCMOS工艺设计了光接收机前端放大电路.在前置放大器中,设计了一种高增益有源反馈跨阻放大器,并且可以使输出共模电平在较大范围内调解.在限幅放大器中,通过在改进的Cherry-Hooper结构里引入有源电感负反馈来进一步扩展带宽.整个前端放大电路具有较高的灵敏度和较宽的输入动态范围.Hspice仿真结果表明该电路具有119dB的中频跨阻增益,2.02GHz的带宽,对于输入电流幅度从1.4μA到170μA变化时,50Ω负载线上的输出电压限幅在320mV(V_(pp)),输出眼图稳定清晰.核心电路静态功耗为45.431mW.