A CMOS transconductor with multidecade tuning using balanced current scaling in moderate inversion

A versatile CMOS transconductor is proposed. Voltage-to-current conversion employs a polysilicon resistor and features high linearity over a wide input range and high current efficiency. Programmable balanced current mirrors able to operate in weak or moderate inversion regions provide wide transcon...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2005-05, Vol.40 (5), p.1078-1083
Main Authors: Lopez-Martin, A.J., Jaime Ramirez-Angulo, Durbha, C., Carvajal, R.G.
Format: Article
Language:English
Subjects:
Analog circuits
Analog CMOS circuits
Applied sciences
Balancing
Circuit properties
CMOS
continuous-time filters
Current mirrors
Degradation
Design. Technologies. Operation analysis. Testing
Distortion measurement
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Energy consumption
Exact sciences and technology
Frequency filters
Gain
Integrated circuits
Inversions
Linearity
low-voltage CMOS circuits
Mirrors
moderate inversion
Performance gain
Resistors
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Transconductance
Transconductors
Tuning
Voltage
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Summary:A versatile CMOS transconductor is proposed. Voltage-to-current conversion employs a polysilicon resistor and features high linearity over a wide input range and high current efficiency. Programmable balanced current mirrors able to operate in weak or moderate inversion regions provide wide transconductance gain tuning range without degrading other performance parameters like input range and linearity. The transconductor has two degrees of freedom for gain tuning. A 0.5-/spl mu/m implementation achieves a SFDR of 68 dB and a THD of -66.5dB using a dual supply of /spl plusmn/1.3 V with differential input swings equal to 77% of the total supply voltage, transconductance tuning over two decades, and 1.7 mW of static power consumption. Measurements demonstrate that operation in moderate inversion can lead to much less distortion levels than in strong inversion.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2005.845980