|Table of Contents|

[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]

Analysis and design of high linearity current referencefor current mode circuits()

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

2009 1
Research Field:
Circuit and System
Publishing date:


Analysis and design of high linearity current referencefor current mode circuits
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
linear voltage-to-current converter harmonic distortion operational amplifier PTAT current reference
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.


[1] Fotouhi B.All-MOS voltage-to-current converter [J].IEEE Journal of Solid-State Circuits, 2001, 36(1):147-151.
[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.


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.
Last Update: 2009-03-20