光学 精密工程, 2014, 22 (10): 2855, 网络出版: 2014-11-06  

流水线模数转换器中的宽带电流型运算放大器

Wide band current-mode amplifier for pipelined ADC
作者单位
太原理工大学 新型传感器与智能控制教育部重点实验室,山西 太原 030024
摘要
针对高清视频信号处理对动态范围大,运算速度快的模数转换器(ADC)的要求, 提出了一种流水线宽带电流型运算放大器。该运算放大器的主放大器采用套筒式增益提高结构,辅助运算放大器用电流型放大器替代。采用电流共模反馈电路调节主运算放大器的支路电流以稳定输出共模电平;采用TSMC 0.18 μm CMOS工艺设计电路。实验结果显示:辅助运算放大器采用源极输入,减小了信号主通路上的寄生电容,提高了整个运算放大器的电路速度。运算放大器的增益为83.19 dB,相位裕度为61.6°,单位增益带宽为1.6 GHz,功耗为9.3 mW;在满幅度阶跃输入的情况下,输出建立时间小于1.83 ns。将该运算放大器用于高清视频信号的流水线ADC中,实现了170 MS/s,10 bit精度的模数转换。同传统的电压型运算放大器相比,该运算放大器响应速度更快,功耗更低,可满足处理视频信号的要求。
Abstract
A novel bandwidth current operational amplifier was presented to meet the demand of video signal processing for a pipelined Analog-to-Digital Converter(ADC) with large dynamic ranges and higher operation speeds. In the system, the main amplifier adopts a cascode structure and the auxiliary amplifier is a current mode amplifier. In order to improve circuit speeds and to decrease parasitic capacitance, the input signal was applied to the source terminal. A current-mode feedback circuit was utilized to stabilize the out common mode voltage through adjusting the currents of the main amplifier and the amplifier was implemented in TSMC 0.18 μm CMOS process with a consumer of 9.3 mW. Experiment results show that the circuit has an open loop gain of 83.19dB, a unity gain bandwidth of 1.6 GHz and a phase margin of 61.6°. A pipelined ADC for high-resolution video signal process using this current amplifier achieves a resolution of 10 bit and a sampling rate of 170 MS/s. Compared with traditional amplifiers , the proposed amplifier shows a lower power dissipation and higher response speeds and satisfies the requirements of the video signal processing.
参考文献

[1] 马庆军,宋克非,曲艺,等. 紫外临边成像光谱仪CCD电路系统的设计[J].光学精密工程,2011,19(7): 1538-1545.

    MA Q J, SONG K F, QU Y,et al.. Design of CCD circuit systems for ultraviolet limb imaging spectrometers [J]. Opt. Precision Eng., 2011,19(7):1538-1545 . (in Chinese)

[2] KUMNGERN M. A new CMOS second generation current conveyor with variable current gain [C]. Proceeding of 2012 IEEE International Conference on Circuits & Systems, Kuala Lumpur, Malaysia: ICCAS, 2012:272-275.

[3] 曹慧亮,李宏生,王寿荣,等.硅微机械陀螺仪测控电路的温度补偿[J]. 光学精密工程,2013,21(12):3118-3125.

    CAO H L, LI H SH, WANG SH R, et al.. Temperature compensation of monitoring circuit for silicon MEMS gyroscope [J]. Opt. Precision Eng., 2013, 21(12): 3118-3125.(in Chinese)

[4] 黄向东,刘立丰,谭久彬,等.调幅式电容位移传感器的峰值检波电路设计[J].光学精密工程,2012,20(11):2444-2449.

    HUANG X D, LIU L F, TAN J B, et al.. Design of peak detector circuit for AM capacitive displacement sensor [J]. Opt. Precision Eng., 2012, 20(11): 2444-2449.(in Chinese)

[5] 刘晓为,尹亮,李海涛,等.闭环电容式微加速度计全差分CMOS接口电路[J].光学精密工程,2011,19(3):580-586.

    LIU X W, YIN L, LI H T, et al.. Full differential CMOS interface circuit for closed-loop capacitive micro-accelerometers [J]. Opt. Precision Eng., 2011, 19(3):580-586 .(in Chinese)

[6] HAGA Y,KALE I. CMOS buffer using complementary pair of bulk-driven super source followers[J]. IEEE Transactions on Electronics Letters, 2009, 45(27):917-918

[7] JIN B, MOON J, ZHAO C,et al.. A 30.8-dBm wideband CMOS power amplifier with minimized supply fluctuation [J].IEEE Trans. Microw. Theory Tech., 2012, 60(6):1658-1666.

[8] 赵阳,裘安萍,施芹,等. 微机械陀螺检测接口建模及前置放大器优化[J].光学精密工程,2013,21(7): 1734-1740.

    ZHAO Y, QIU A P, SHI Q, et al.. Modeling of sensing interface for micromachined gyroscope and its front-end optimization [J]. Opt. Precision Eng., 2013, 21(7):1734-1740 .(in Chinese)

[9] ZANCHI A, DONG-YOUNG C. A 16-bit 65-MS/s pipeline ADC with 80-dBFS SNR using analog auto-calibration in SiGe SOI complementary BiCMOS[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2008, 55 (8): 2166-2177.

[10] CHOWDHURY D,YE L,ALON E,et al.. An efficient mixed-signal 2.4-GHz polar power amplifier in 65-nm CMOS technology [J]. IEEE J. Solid-State Circ., 2011, 46(8): 1796-1808.

[11] AHMADPOUT A. An ultra high-speed and low-voltage amplifier for switched-capacitor applications [C]. Proceeding of the Sixth Annual International Conference of Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology Association, Pataya City, Thailand: ECTI-CON 2009, 2009: 552-555.

[12] YAVARI M,SHOAEI O. Very low-voltage, low-power and fast-settling OTA for switched-capacitor applications [C]. IEEE International Symposium on Circuits & Systems, ISCAS 2002, 2002: 416-419.

[13] MUSA R. Design of single-stage folded-cascode gain boost amplifier for 100mW 10-bit 50MS/s pipelined analog-to-digital converter [C]. Proceedings of the 28th International Conference on Software Engineering, ShangHai, China: ICSE2006, 2006:800-804.

贾华宇, 刘丽, 张建国. 流水线模数转换器中的宽带电流型运算放大器[J]. 光学 精密工程, 2014, 22(10): 2855. JIA Hua-yu, LIU Li, ZHANG Jian-guo. Wide band current-mode amplifier for pipelined ADC[J]. Optics and Precision Engineering, 2014, 22(10): 2855.

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