A curvature calibrated bandgap reference with base–emitter current compensating in a 0.13 <i>μ</i>m CMOS process

Ma Zhuo; Tan Xiaoqiang; Xie Lunguo; Guo Yang

doi:10.1088/1674-4926/31/11/115004

J. Semicond. > 2010, Volume 31 > Issue 11 > 115004

SEMICONDUCTOR INTEGRATED CIRCUITS

A curvature calibrated bandgap reference with base–emitter current compensating in a 0.13 μm CMOS process

Ma Zhuo, Tan Xiaoqiang, Xie Lunguo and Guo Yang

+ Author Affiliations

DOI: 10.1088/1674-4926/31/11/115004

Abstract: In bandgap references, the effect caused by the input offset of the operational amplifier can be effectively reduced by the utilization of cascade bipolar junction transistors (BJTs). But in modern CMOS logic processes, due to the small value of β , the base--emitter path of BJTs has a significant streaming effect on the collector current, which leads to a large temperature drift for the reference voltage. To solve this problem, a base–emitter current compensation technique is proposed in a cascade BJT bandgap reference structure to calibrate the curvature of the output voltage to temperature. Experimental results based on the 0.13 μm logic CMOS process show that the reference voltage is 1.238 V and the temperature coefficient is 6.2 ppm/℃ within the range of -40 to 125 ℃.

Key words: bandgap reference, CMOS, BJT, base current compensating

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Ma Zhuo, Tan Xiaoqiang, Xie Lunguo, Guo Yang. A curvature calibrated bandgap reference with base–emitter current compensating in a 0.13 μm CMOS process[J]. Journal of Semiconductors, 2010, 31(11): 115004. doi: 10.1088/1674-4926/31/11/115004

Ma Z, Tan X Q, Xie L G, Guo Y. A curvature calibrated bandgap reference with base–emitter current compensating in a 0.13 μm CMOS process[J]. J. Semicond., 2010, 31(11): 115004. doi: 10.1088/1674-4926/31/11/115004.

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Received: 18 August 2015 Revised: 24 June 2010 Online: Published: 01 November 2010

In bandgap references, the effect caused by the input offset of the operational amplifier can be effectively reduced by the utilization of cascade bipolar junction transistors (BJTs). But in modern CMOS logic processes, due to the small value of β , the base--emitter path of BJTs has a significant streaming effect on the collector current, which leads to a large temperature drift for the reference voltage. To solve this problem, a base–emitter current compensation technique is proposed in a cascade BJT bandgap reference structure to calibrate the curvature of the output voltage to temperature. Experimental results based on the 0.13 μm logic CMOS process show that the reference voltage is 1.238 V and the temperature coefficient is 6.2 ppm/℃ within the range of -40 to 125 ℃.

A curvature calibrated bandgap reference with base–emitter current compensating in a 0.13 μm CMOS process

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