A Resistor-Compensation Technique for CMOS Bandgap and Current Reference with Simplified Start-Up Circuit

Guo-Ming SUNG  Ying-Tsu LAI  Chien-Lin LU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.4   pp.670-673
Publication Date: 2011/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.670
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Circuits
Keyword: 
bandgap reference,  current reference,  resistor-compensated technique,  temperature coefficient,  start-up circuit,  

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Summary: 
This paper presents a resistor-compensation technique for a CMOS bandgap and current reference, which utilizes various high positive temperature coefficient (TC) resistors, a two-stage operational transconductance amplifier (OTA) and a simplified start-up circuit in the 0.35-µm CMOS process. In the proposed bandgap and current reference, numerous compensated resistors, which have a high positive temperature coefficient (TC), are added to the parasitic n-p-n and p-n-p bipolar junction transistor devices, to generate a temperature-independent voltage reference and current reference. The measurements verify a current reference of 735.6 nA, the voltage reference of 888.1 mV, and the power consumption of 91.28 µW at a supply voltage of 3.3 V. The voltage TC is 49 ppm/ in the temperature range from 0 to 100 and 12.8 ppm/ from 30 to 100. The current TC is 119.2 ppm/ at temperatures of 0 to 100. Measurement results also demonstrate a stable voltage reference at high temperature (> 30), and a constant current reference at low temperature (< 70).