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A Wideband IM3 Cancellation Technique for CMOS {\bf \Pi } - and T-Attenuators

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5 Author(s)

A wideband IM3 cancellation technique for CMOS attenuators is presented. With proper transistor width ratios, the dominant distortion currents of transistor switches cancel each other. As a result, a high IIP3 robust to PVT variations can be achieved without using large transistors. Two prototypes in a 0.16 μm standard bulk CMOS process are presented: a Π-attenuator with four discrete settings obtains +26 dBm IIP3 and +3 dBm 1 dB-compression point (CP) for 50 MHz to 5 GHz with only 0.0054 mm2 active area, and a similar T-attenuator system which obtains +27 dBm IIP3 and +13 dBm CP for 50 MHz to 5.6 GHz with only 0.0067 mm2 active area.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 2 )

Date of Publication:

Feb. 2013

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