基于反相器的全差分电流饥饿型运算放大器的设计
首发时间:2019-10-08
摘要:介绍了一种应用于CT机内低功耗Sigma-Delta调制器中的跨导运算放大器。通过对传统运放结构进行比较,提出了一种基于反相器的全差分电流饥饿型跨导运算放大器结构。由于跨导运算放大器是开关电容积分器电路的主要构成模块,消耗了电路的大部分功耗,因此研究主要集中于优化运放的能量效率上。该跨导运算放大器采用XFAB 0.18μm mixed signal CMOS工艺进行设计,利用Cadence/Spectre仿真器进行仿真验证,结果表明该运放的直流增益可达99.51dB,单位增益带宽为73.73MHz,相位裕度为71.29 ,功耗仅为718μW,满足低功耗Sigma-Delta调制器的要求。
关键词: 跨导运算放大器(OTA) 高能效 电流饥饿型 全差分 反相器型
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Design of Current-Starved Inverter-Based Fully-Differential Op-Amp
Abstract:An operational transconductance amplifier for low power Sigma-Delta modulator in CT is presented. By comparing the traditional operational amplifier structures, a fully-differential current-starved inverter-based operational transconductance amplifier structure is proposed. Because the operational transconductance amplifier is the main component of the switched capacitor integrator circuit, which consumes most of the power of the circuit, the research mainly focuses on optimizing the energy efficiency of the operational amplifier. The operational transconductance amplifier is designed by using XFAB 0.18 μm mixed signal CMOS technology and simulated by Cadence/Spectre simulator. The results show that the DC gain of the operational amplifier can reach 99.51 dB, the unit gain bandwidth is 73.73 MHz, the phase margin is 71.29 degrees, and the power consumption is only 718 μW, which meets the requirements of low power Sigma-Delta modulator.
Keywords: operational transconductance amplifier energy-efficiency current-starved fully-differential inverter-based
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