带温度补偿和AGC功能的10Gb/s跨阻放大器设计  

Design of 10Gb/s transimpedance amplifier with temperature compensation and AGC circuit

作　　者：陈伟[1] 黄启俊[1] 何进[1] 王豪[1] 常胜[1] 童志强[2] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072 [2]武汉烽火通信科技股份有限公司微电子部,湖北武汉430074

出　　处：《电子技术应用》2017年第4期51-54,共4页Application of Electronic Technique

基　　金：中央高校基本科研基金(2042016kf0189;2042015kf0174;2042014kf0238)

摘　　要：基于0.18μm BiCMOS工艺设计了一个工作速率为10Gb/s的跨阻放大器。为了解决温度变化对放大器性能的影响,引入了与温度变化有关联的电流(温度电流),从而锁存成与温度有关联的电压给跨阻放大器供电,使得放大器增益在频带内平坦和带宽变化减小。为了扩大输入信号的动态范围,引入了可变MOS电阻来实现AGC功能,使得放大器可以工作在较大的输入功率。为了提高增益,引入了两级差分放大电路,同时采用电容简并的方法来进一步扩展带宽。版图后仿真结果表明,跨阻放大器电路差分跨阻增益为9 kΩ,-3dB带宽为8.7GHz,等效输入电流噪声为17 pA/√Hz,灵敏度为-20 dBm,输入饱和光电流为2 mA,功耗为66 mW,电源噪声抑制比为-16 dB,放大器核心电路版图面积为94 mm×63 mm,整体版图面积为937 mm×828 mm,满足商业应用的要求。Based on the 0.18 μm BiCMOS process, a 10 Gb/s transimpendence amplifier is designed. In order to solve the influence of temperature variation on the performance of amplifier, the current associated with the change of temperature is introduced（temperature current）, thereby the temperature current is locked into the temperature voltage to power the transimpedance amplifier,which makes the gain flat in the band and the bandwidth change reduced. In order to extend the dynamic range of the input signal, the variable MOS resistor is introduced to realize the Auto Gain Control（AGC） function, so that the amplifier can operate at a large input power. In order to improve the gain, two differential amplifier circuits are introduced, and adopts the method of capacitance degeneration to further extend the bandwidth. Post layout simulation results show that the amplifier differential transimpedance gain is 9 kΩ,-3 dB bandwidth is 8.7GHz, the equivalent input noise current is 17 pA/√Hz, the sensitivity is-20 dBm, the input saturation photocurrent is 2 mApp, the power consumption is 66 mW and the power supply noise suppression ratio is-16 dB.The area of overall amplifier circuit layout occupies 937 mm × 828 mm, yet the core amplifier area is 94 mm × 63 mm. Therefore, the designed transimpendence amplifier fully meets the requirements of the business applications.

关 键 词：温度补偿 温度电流 AGC 跨阻放大器 宽动态输入电流 电容简并 

分 类 号：TN929.1[电子电信—通信与信息系统]