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A High-Frequency Transconductor Using a Robust Nonlinearity Cancellation

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2 Author(s)
Lewinski, A. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX ; Silva-Martinez, J.

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

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:53 ,  Issue: 9 )