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设计了一个应用于高精度流水线结构ADC中的高增益、宽频带全差分运算跨导放大器(OTA)。整体运放采用了2级结构,第一级采用套筒共源共栅结构,并结合增益自举技术来提高增益;第二级采用共源放大器结构作为输出级,以增大运放的输出信号摆幅。该设计采用UMC0.18μmCMOS工艺,版图面积为320μm×260μm。仿真结果显示:在1.8 V电源供电5 pF负载下,在各个工艺角及温度变化下增益高于120 dB,增益带宽积(GBW)大于800 MHz,而整个运放消耗16.36 mA的电流,FOM值为306 MHz.pF/mA。
A high-gain, wideband, fully differential transconductance amplifier (OTA) is designed for high-precision pipelined ADCs. The overall op amp uses a two-stage structure, the first stage using a cascode cascode structure, combined with gain bootstrap technology to increase the gain; the second stage uses a common-source amplifier structure as the output stage to increase the op amp output Signal swing. The design uses UMC0.18μmCMOS process, the layout area of 320μm × 260μm. The simulation results show that the gain is higher than 120 dB and the gain-bandwidth product (GBW) is greater than 800 MHz under the 5 pF load of 1.8 V power supply, while the op amp consumes 16.36 mA of current, FOM value 306 MHz.pF/mA.