[1] Zhou Mingzhu, Zhu En, Wang Shoujun, Wang Zhigong, et al. Analysis and design of high linearity current referencefor current mode circuits [J]. Journal of Southeast University (English Edition), 2009, 25 (1): 18-22. [doi:10.3969/j.issn.1003-7985.2009.01.005]
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Analysis and design of high linearity current referencefor current mode circuits(
)
电流模逻辑电路中高线性度电流参考源的分析与设计
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 25
- Issue:
- 2009 1
- Page:
- 18-22
- Research Field:
- Circuit and System
- Publishing date:
- 2009-03-30
Info
- Title:
- Analysis and design of high linearity current referencefor current mode circuits
- 电流模逻辑电路中高线性度电流参考源的分析与设计
- Author(s):
- Zhou Mingzhu1, Zhu En1, Wang Shoujun2, Wang Zhigong1, Han Peng1, Li Wei1
-
1Institute of RF- & OE-ICs, Southeast University, Nanjing 210096, China
2 IDT-Shanghai, Shanghai 200233, China
- Keywords:
- linear voltage-to-current converter; harmonic distortion; operational amplifier; PTAT current reference
- PACS:
- TN432
- DOI:
- 10.3969/j.issn.1003-7985.2009.01.005
- Abstract:
- A complementary metal-oxide-semiconductor transistor(CMOS)voltage-to-current(VTC)converter with high linearity for current-mode analog and digital integrated circuits is described.A high gain operational amplifier(OPA)is utilized to form negative feedback.A proportional to absolute temperature(PTAT)current reference with transistors operated in a weak inversion is used as the bias circuit.The resistor and the OPA nonlinearity behavior are analyzed in detail.By optimizing parameters in OPA and adopting a small voltage coefficient poly-silicon resistor as a linear device, a high linearity is achieved.The circuit is implemented in a standard 0.6 μm CMOS technology.The low frequency gain of the OPA exceeds 90 dB.The test results indicate that the total harmonic distortion(THD)is 0.000 2%.The common-mode input linearity range is 0 to 2.6 V.Correspondingly, the output current range is 50 to 426 μA.The sensitivity of the PTAT current reference to Vdd is approximately 0.021 7.The chip consumes a power of less than 1.3 mW for a 5 V supply, and occupies an area of 0.112 mm2.
- 描述了应用于电流模逻辑电路中的高线性度电压-电流转换电路的设计与实现.该电路采用高增益两级运算放大器构成负反馈, 偏置电路利用工作在弱反型区的MOS管电压电流呈指数律关系构成PTAT(proportional to absolute temperature)基准电流源.详细分析了电阻的类型以及运算放大器的参数对线性度的影响.通过优化运算放大器的参数并采用电压系数较小的多晶硅电阻作为线性器件获得了较高的线性度.本电路已采用CSMC 0.6 μm CMOS工艺实现, 测试结果表明:输出的总谐波失真为0.000 2%.输入动态范围为0~2.6 V, 输出电流为50~426 μA.PTAT基准电流源对电源变化的灵敏度为0.021 7.芯片采用5 V供电, 功耗约为1.3 mW, 芯片面积为0.112 mm2.
References:
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[2] Chen R Y, Hung T S.A linear CMOS voltage-to-current converter [C]//Proceedings of International Symposium on Signals, Circuits and Systems, ISSCS 2005.Iasi, Romania, 2005, 2:677-680.
[3] Padilla I, Ramírez -Angulo J, Carvajal R G.Highly linear V/I converter with programmable current mirrors [C]//IEEE International Symposium on Circuits and Systems, ISCAS2007.New Orleans, LA, USA, 2007:941-944.
[4] Hernes B, Sansen W.Distortion in single-, two- and three-stage amplifiers [J].IEEE Trans on Circuits and Systems Ⅰ:Regular Papers, 2005, 52(5):846-856.
[5] Hastings A.The art of analog layout[M].Beijing:Tsinghua University Press, 2002.
[6] Gray P R.Analysis and design of analog integrated circuits [M].4th ed.Beijing:Higher Education Press, 2003.
[7] Haft-Baradaran A.Basic and advanced current references [R].Toronto:University of Toronto, 2001.
[8] Allen P E, Holberg D R.CMOS analog circuit design [M].2nd ed.Beijing:Publishing House of Electronics Industry, 2002.
Memo
- Memo:
-
Biographies: Zhou Mingzhu(1981—), female, graduate;Zhu En(corresponding author), male, doctor, professor, zhuenpro@yahoo.com.cn.
Citation: Zhou Mingzhu, Zhu En, Wang Shoujun, et al.Analysis and design of high linearity current reference for current mode circuits[J].Journal of Southeast University(English Edition), 2009, 25(1):18-22.