CMOS Active Inductor Linearity Improvement Using Feed-Forward Current Source Technique

MOSFET drain current second-order nonlinearity has a significant impact on the linearity of current regulated CMOS active inductors. It tends to compress MOSFET transconductance ( g m ) by generating excess dc current ( I EX ) in the channel, which is a function of incoming input signal amplitude. T...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2009-08, Vol.57 (8), p.1915-1924
Main Authors: Chun-Lee Ler, A'ain, A., Kordesch, A.V.
Format: Article
Language:English
Subjects:
Active inductors
Applied sciences
CMOS
CMOS integrated circuits
CMOS technology
Current sources
DC generators
Design. Technologies. Operation analysis. Testing
Direct current
Drains
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Feedforward systems
Flexible electronics
gyrators
Inductance
Inductors
Integrated circuits
Linearity
Magnetic devices
MOSFET circuits
MOSFETs
Nonlinearity
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal generators
Transconductance
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Summary:MOSFET drain current second-order nonlinearity has a significant impact on the linearity of current regulated CMOS active inductors. It tends to compress MOSFET transconductance ( g m ) by generating excess dc current ( I EX ) in the channel, which is a function of incoming input signal amplitude. This generated excess dc current can change the original dc operating point of the current regulated CMOS active inductor, and thus, influence the inductance. Unfortunately, MOSFET drain current second-order nonlinearity contributes more to MOSFET g m compression than MOSFET drain current third-order nonlinearity. In this paper, a new technique known as feed-forward current source (FFCS) has been proposed to improve the linearity of the active inductor. The proposed FFCS technique makes use of the second-order nonlinear property of a MOSFET that generates I EX when an input ac signal is applied. The generated I EX is then fed-forward to the current source of the active inductor to drain out the I EX in the active inductor. This prevents the dc operating point from shifting and improves its inductance linearity. Single-ended and differential active inductors with the proposed FFCS circuit have been fabricated using Silterra's CMOS 0.18-mum technology to verify the proposed technique.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2009.2025426