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A cellular-band CDMA 0.25-/spl mu/m CMOS LNA linearized using active post-distortion

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4 Author(s)
Namsoo Kim ; Qualcomm, San Diego, CA ; Aparin, V. ; Barnett, K. ; Persico, C.

The theory of a linearization method using active post-distortion (APD) is explained for low-frequency and high-frequency applications. The low-frequency cancellation is explained in power series format and the high-frequency cancellation is explained in Volterra series format. The method is utilized for a cellular band (869-894 MHz) CDMA low-noise amplifier (LNA), which is implemented in 0.25-mum CMOS process. The LNA achieves 1.2 dB NF, 16.2 dB power gain, and +8 dBm IIP3 while consuming 12 mA current from 2.6 V supply voltage. It shows 13.5 dB of IM3 product reduction with 0.15 dB NF penalty in comparison with an LNA which does not use the APD method

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 7 )