摘要
基于全差分结构提出一种高速BiCMOS运算跨导放大器,该放大器采用两级放大结构实现,可用于8位250 Msps流水线结构模数转换器的采样/保持电路中。电路使用0.35μmBiCMOS工艺实现,由3.3 V单电源供电,经优化设计后,实现了2.1 GHz的单位增益带宽,直流开环增益61 dB,相位裕度50°,功耗16 mW,输出摆幅达到2 V;在2 pF的负载电容下,建立时间小于0.6 ns,转换速率1 200 V/μs。该放大器完全符合设计要求的性能指标。
A 3.3 V fully differential BiCMOS operational transconductance amplifier （OTA） was designed. It was realized by two-stage structure, and could be used in sampling-holding circuit of an 8 bits 250 Msps pipelined analog-digital converter （ADC）. The simulated DC gain of the OTA is 61 dB and its unity gain frequency is 2.1 GHz at a phase margin of 50°. The OTA has a differential output swing of 2 V and dissipates 16 mW. This OTA settles within 0.6 ns and the SR is 1 200 V/μs while driving 2 pF capacitive loads. All the design is based on the process model of Xfab 0.35 μm BiCMOS.
出处
《半导体技术》
CAS
CSCD
北大核心
2009年第1期41-44,共4页
Semiconductor Technology
