Title :
A CMOS transconductor with 80-dB SFDR up to 10 MHz
Author :
Chilakapati, Uma ; Fiez, Terri S. ; Eshraghi, Aria
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA
fDate :
3/1/2002 12:00:00 AM
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-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
Keywords :
CMOS analogue integrated circuits; circuit feedback; continuous time filters; convertors; harmonic distortion; operational amplifiers; 0.35 micron; 1 MHz; 10 MHz; 10.56 mW; 3.3 V; CMOS transconductor; OTA; SFDR; THD; V-I converter; continuous-time filters; differential input swing; input resistors; negative feedback; operational transconductance amplifier; power dissipation; spurious-free dynamic range; third-order intermodulation spurs; total harmonic distortion; unity-gain feedback; CMOS process; Differential amplifiers; Distortion measurement; Dynamic range; Negative feedback; Operational amplifiers; Resistors; Total harmonic distortion; Transconductance; Transconductors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
