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

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3 Author(s)
Chilakapati, U. ; Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA ; Fiez, T.S. ; Eshraghi, A.

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-Vpp 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-Vpp differential input and third-order intermodulation spurs measure less than -79 dBe for 1.8-Vpp differential inputs at 1 MHz. The transconductance core dissipates 10.56 mW from a 3.3-V supply and occupies 0.4 mm2 in a 0.35-μm CMOS process

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:37 ,  Issue: 3 )