A CMOS transconductor with 80-dB SFDR up to 10 MHz

A CMOS transconductor uses resistors at the input and an OTA in unity-gain feedback to achieve 80-dB spurious-free dynamic range (SFDR) for 3.6-V/sub pp/ differential inputs up to 10 MHz. The combination of resistors at the input and negative feedback around the operational transconductance amplifie...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2002-03, Vol.37 (3), p.365-370
Main Authors: Chilakapati, U., Fiez, T.S., Eshraghi, A.
Format: Article
Language:English
Subjects:
Circuits
CMOS
CMOS process
Differential amplifiers
Dissipation
Distortion measurement
Dynamic range
Harmonic distortion
Negative feedback
Noise levels
Operational amplifiers
Resistors
Total harmonic distortion
Transconductance
Transconductors
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Summary:A CMOS transconductor uses resistors at the input and an OTA in unity-gain feedback to achieve 80-dB spurious-free dynamic range (SFDR) for 3.6-V/sub pp/ differential inputs up to 10 MHz. The combination of resistors at the input and negative feedback around the operational transconductance amplifier (OTA) allows this transconductor to accommodate a differential input swing of 4 V with a 3.3-V supply. The total harmonic distortion (THD) of the transconductor is -77 dB at 10 MHz for a 3.6-V/sub pp/ differential input and third-order intermodulation spurs measure less than -79 dBe for 1.8-V/sub pp/ differential inputs at 1 MHz. The transconductance core dissipates 10.56 mW from a 3.3-V supply and occupies 0.4 mm/sup 2/ in a 0.35-/spl mu/m CMOS process.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.987089