Anti-interference pseudo-differential wideband LNA for DVB-S.2 RF tuners

摘要

A novel pseudo-differential wideband Low Noise Amplifier (LNA) for DVB-S.2 Radio Frequency (RF) tuners is proposed. Based on narrow-band source degenerated structure, the proposed wideband LNA, covering the Digital Video Broadcast-Satellite.2 (DVB-S.2) band, demonstrates a higher gain and a lower Noise Figure (NF) than traditional wideband LNAs. Furthermore, a pseudo-differential topology is proposed to separate and cancel the in-band interferences. Designed and simulated in a 0.18 um CMOS, the proposed wideband LNA demonstrates an NF better than 2.5 dB and an input matching better than -10 dB with a gain higher than 18 dB over the operating band from 950 MHz to 2150 MHz. The LNA also achieves a typical 30 dB suppression of the interferences from the GSM signals. The simulated input-referred 3