A Constant g ₘ Current Reference Generator With Pseudo Resistor-Based Compensation

Most analog circuits need a current reference generator to provide a stable biasing point for the transistors. Given the limited voltage headroom in advanced node technologies, there would be notable restrictions on the tolerance of the reference current deviation. Use of off-chip reference generato...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. I, Regular papers Vol. 69; no. 3; pp. 1115 - 1124
Main Authors Shahghasemi, Mohsen, Odame, Kofi M.
Format Journal Article
LanguageEnglish
Published New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.03.2022
Subjects
Analog circuits
Generators
Power consumption
Transistors
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Summary:Most analog circuits need a current reference generator to provide a stable biasing point for the transistors. Given the limited voltage headroom in advanced node technologies, there would be notable restrictions on the tolerance of the reference current deviation. Use of off-chip reference generators adds to the size of the system while the on-chip reference current generators are still partially dependent on the on-chip resistor values which is prone to technology variations. We propose an on-chip reference generator with a fully off-chip resistor which has less sensitivity to process variations. Monte-Carlo simulation results shows that the proposed has 31% more precision compared to the conventional on-chip reference generator. Measurement results in [Formula Omitted] CMOS shows that the chip produces a stable reference current that is defined based on an off-chip resistor. The proposed structure consumes the same current as conventional and does not add to the power consumption.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2021.3123279