CAJ | 학술논문

提出了一种应用于流水线型模数转换器(ADC)的增益提高型套筒式全差分跨导放大器(OTA)的设计与分析方法.通过ADC的性能要求推导出OTA的设计指标.该设计中OTA的架构由主运放、增益辅助运放及共模反馈电路3部分子电路组成.设计采用SMIC CMOS 0.18mm工艺平台.该设计方法的实验结果表明:1pF负载下,跨导放大器.的直流增益达到145dB,单位增益带宽超过750MHz,相位裕度达到58°.闭环增益为4时,放大器在20ns内稳定到0.05%的精度.
제출료일충응용우류수선형모수전환기(ADC)적증익제고형투통식전차분과도방대기(OTA)적설계여분석방법.통과ADC적성능요구추도출OTA적설계지표.해설계중OTA적가구유주운방、증익보조운방급공모반궤전로3부분자전로조성.설계채용SMIC CMOS 0.18mm공예평태.해설계방법적실험결과표명:1pF부재하,과도방대기.적직류증익체도145dB,단위증익대관초과750MHz,상위유도체도58°.폐배증익위4시,방대기재20ns내은정도0.05%적정도.
This paper describes the design and analysis of a fully differential, gain-enhanced CMOS telescopic operational transconductance amplifier (OTA) used in a pipeline analog-to-digital converter (ADC). Specifications of the OTA are derived from the requirements of ADC. Simulation shows that for a lpF load capacitance, this OTA achieves a high DC gain (approximately 145dB) and a wide unity-gain bandwidth (above 750MHz) at a phase margin 58°. In a configuration where the closed loop-gain is 4, the design spends about 18ns for settling with 0.05% accuracy. Simulations of this design are performed in SMIC CMOS 0.18μm technology.