A Tx RF 0.1dB IL bandpass filter for fully digital cellular transmitters in 65-nm CMOS

Fabien Robert (1) , Philippe Cathelin (2) , Antoine Diet (3) , Pascal Triaire (4) , Fabio Epifano (4) , Martine Villegas (1) , Geneviève Baudoin (1)

1 ESYCOM - Electronique, Systèmes de communication et Microsystèmes
2 STEricsson
3 DRE - Département de Recherche en Electromagnétisme ; EMG - Département Electromagnétisme - L2S
4 ST-CROLLES - STMicroelectronics [Crolles]

In this paper, we present a bandpass filter designed and implemented in 65-nm CMOS. From 0.8-2.2GHz filtering requirements are very challenging. This filter is dedicated to fully digital RF Tx cellular architectures, and is available for any Tx architecture. Our filter uses highly linear CMOS active inductors that exhibit Q factors above 1000 at cellular frequencies to reduce filter insertion losses. The highly linear characteristic of implemented active inductors drive it us to 0dBm operation while providing at least 24dB attenuation at ± 400MHz from F0. Measurement results of the filter show a central frequency (F0) of 1.8GHz with 135MHz of -3dB bandwidth (BW) with less than 0.1dB IL

Keywords: digital architecture; transmitter

Domains: Engineering Sciences [physics]; Electronics

Fabien Robert, Philippe Cathelin, Antoine Diet, Pascal Triaire, Fabio Epifano, et al.. A Tx RF 0.1dB IL bandpass filter for fully digital cellular transmitters in 65-nm CMOS. SiRF 2012, Jan 2012, Santa Clara, United States. pp.41 - 44, ⟨10.1109/SiRF.2012.6160124⟩. ⟨hal-00778180⟩