Title :
A High-Frequency Transconductor Using a Robust Nonlinearity Cancellation
Author :
Lewinski, Artur ; Silva-Martinez, Jose
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX
Abstract :
This brief deals with the design of a linear operational transconductance amplifier (OTA) intended for high-frequency continuous-time filters. Three source-degenerated differential pairs are used to reduce the third-order distortion components regardless of process parameter tolerances and bias current. Experimental results for an OTA fabricated in the TSMC 0.35-mum CMOS process are presented and compared with recently reported topologies. Draining 2.8 mA from a single supply voltage of 3.3 V, the transconductor achieves IM3<-70 dB for a two-tone input signal of 1.3 Vpp measured at 70 MHz. The input referred noise density is only 7 nV/radicHz, leading to an SNR of 75 dB
Keywords :
CMOS integrated circuits; continuous time filters; operational amplifiers; 0.35 micron; 2.8 mA; 3.3 V; 70 MHz; CMOS process; continuous-time filters; high-frequency transconductor; linear operational transconductance amplifier; linearity enhancement; robust nonlinearity cancellation; source-degenerated differential pairs; Circuit noise; Filters; High definition video; Linearity; Operational amplifiers; Robustness; Tail; Transconductance; Transconductors; Voltage; Linearity enhancement techniques; linear operational transconductance amplifier (OTA); linear transconductor; transconductors;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.880025
