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A CMOS transconductor with 80-dB SFDR up to 10 MHz | IEEE Journals & Magazine | IEEE Xplore

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


Abstract:

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 inp...Show More

Abstract:

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.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 37, Issue: 3, March 2002)
Page(s): 365 - 370
Date of Publication: 07 August 2002

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