Development of Low-Noise Small-Area 24 GHz CMOS Radar Sensor

Min Yoon,Jee-Youl Ryu

doi:10.1155/2016/8534198

Abstract

We present a low-noise small-area 24 GHz CMOS radar sensor for automotive collision avoidance. This sensor is based on direct-conversion pulsed-radar architecture. The proposed circuit is implemented using TSMC 0.13 μm RF (radio frequency) CMOS (fT/fmax=120/140 GHz) technology, and it is powered by a 1.5 V supply. This circuit uses transmission lines to reduce total chip size instead of real bulky inductors for input and output impedance matching. The layout techniques for RF are used to reduce parasitic capacitance at the band of 24 GHz. The proposed sensor has low cost and low power dissipation since it is realized using CMOS process. The proposed sensor showed the lowest noise figure of 2.9 dB and the highest conversion gain of 40.2 dB as compared to recently reported research results. It also showed small chip size of 0.56 mm2, low power dissipation of 39.5 mW, and wide operating temperature range of −40 to +125°C.

Highlights

The rapid evolution of wireless communications has resulted in a strong motivation toward building high performance SoC (System-on-a-Chip) in silicon
The growing demand for larger bandwidth pursues CMOS-based circuits to move toward higher frequencies [1,2,3,4]
The power of −20 dBm is applied from the synthesized sources at both port 1 and port 2

Summary

Introduction

The rapid evolution of wireless communications has resulted in a strong motivation toward building high performance SoC (System-on-a-Chip) in silicon. CMOSbased circuit is realizing its low cost and high level of integration Thanks to these advantages, the growing demand for larger bandwidth pursues CMOS-based circuits to move toward higher frequencies [1,2,3,4]. Recent works have shown these circuits as a promising technology for building high performance RF (radio frequency) circuits for applications above 20 GHz [5,6,7,8] These systems for applications of above 20 GHz contain wireless sensor networks, various portable products, automotive collision avoidance radars, wireless local networks, LMDS (local multipoint distribution service), RTIS (Real Time Traffic Information System), and other ISM band applications. We used the unique layout technique for 24 GHz RF band to reduce parasitic capacitance

Radar Sensor Principle

The Proposed Radar Sensor

Each Block Design of the Proposed Radar Sensor

24 GHz LNA

Experiment Results and Discussion

Conclusion