1.5V CMOS current reference with extended temperature operating range

• Published in: 2002 IEEE International Symposium on Circuits and Systems (ISCAS) Vol. 3; p. III
• Main Author: Badillo, D.A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2002
• Subjects: Circuits; CMOS process; Dielectric substrates; MOS devices; Operational amplifiers; Photonic band gap; Resistors; Silicon; Temperature distribution; Threshold voltage
• DOI: 10.1109/ISCAS.2002.1010194
• ISBN: 9780780374485; 0780374487

Traditional bandgap based current references have restricted temperature operating range due to the limited input common mode range of the feedback amplifier. This paper introduces a modified bandgap current reference that overcomes this limitation by placing a natural device (V/sub th/ /spl sim/ 0V) level shift stage between the amplifier and the bandgap. The circuit has been fabricated in a 0.25-/spl mu/m CMOS process. It generates a reference current of 5/spl mu/A with a temperature variation of 7% over an extended temperature range of -40/spl deg/C to 150/spl deg/C. The bandgap occupies approximately 170/spl times/80/spl mu/m/sup 2/ and draws 56/spl mu/A from a 1.5V supply.