An Image Rejection Ku-Band CMOS Low Noise Amplifier With Bridged-Tee Band-Stop Filter

Depeng Cheng,Lianming Li,Bin Sheng,Xu Wu

doi:10.1109/access.2020.3032174

Abstract

For satellite communication applications, this paper presents an image rejection Ku-band low noise amplifier (LNA) in a 65-nm CMOS process for the Hartley receiver architecture. To achieve high input/output linearity performance, the inductive source degenerated cascode and the capacitive neutralized common-source (CS) amplifier topologies are used in the LNA input and output stages, respectively. To achieve wideband input return loss, the minimum noise figure and high gain performance simultaneously, the inductive source degenerated cascode amplifier is co-designed with the fourth order input impedance matching network. For the image rejection purpose, a bridged-tee band-stop filter is proposed. The measurements show the LNA achieves 14.3-to-18.3 GHz 3 dB bandwidth with 17-to-20 dB power gain, 3.5-to-4 dB noise figure, 17-to-37 dB image rejection and -5 dBm IIP3. Including all pads, the chip occupies a silicon area of 1360 × 450 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and consumes 72 mW DC power.

Highlights

To meet explosive growth of the mobile data traffic, smart vehicles and internet of thing (IoT) applications, terrestrial 5G systems provide eMBB, uRLLC and mMTC services [1]
The satellite communication is regarded as an essential part of 5G infrastructures
To achieve wideband input return loss and low noise figure performance, the inductive source degenerated cascode amplifier topology is co-designed with its fourth order input matching network, and the stability and impedance matching issues of the capacitive neutralized common-source (CS)

Summary

INTRODUCTION

To meet explosive growth of the mobile data traffic, smart vehicles and internet of thing (IoT) applications, terrestrial 5G systems provide eMBB (enhanced mobile broadband), uRLLC (ultra-reliable low latency communications) and mMTC (massive machine type communications) services [1]. To achieve wideband input return loss and low noise figure performance, the inductive source degenerated cascode amplifier topology is co-designed with its fourth order input matching network, and the stability and impedance matching issues of the capacitive neutralized common-source (CS). At 16 GHz, the corresponding optimum Zo∗pt,NF equals to Zin, which is 47-j66 , and the NFmin and Gmax are 1.38 dB and 14.6 dB, respectively With such impedance, it is difficult to achieve good gain, noise figure, and input return loss simultaneously with high efficiency and compact passive network. With such equivalent circuits, to achieve perfect impedance matching, the relationship between the real part of the active gain cell input impedance.

Q1 Q2 k12

CONCLUSION