一种9bit、8Gs/s的超高速跟踪保持放大器设计

A 9 bit 8 Gs/s Very High Speed Track and Hold Amplifier Design

摘要: 提出一种9bit、8Gs/s的超高速跟踪保持放大器（THA）设计.该超高速跟踪保持放大器采用差分结构，对采样模块电路进行了改进，采用二极管连接的三极管和电容进行馈通效应补偿和非线性补偿，减小了跟踪保持放大器总谐波失真，提高了整体分辨率.基于0.18μm SiGe BiCM OS工艺，该跟踪保持放大器的总谐波失真约为-58.6dB，分辨率为9.4bit，跟踪模式带宽为4.6GHz，功耗为65mW.

Abstract: A new design of 9 bit 8 Gs/s very high speed track-and-hold amplifier (THA) is presented.Differential architecture is used in the design,and the compensation of hold mode feedthrough and nonlinearity is realized through diode-connected transistor and capacitor.The total harmonic distortion is reduced and resolution is enhanced.Based on 0.18μm SiGe BiCMOS process,simulations show that THD of the THA is-58.6 dB,resolution is 9.4 bit,track mode bandwidth is 4.6 GHz,and power consumption is 65 mW.