A 239–281GHz Sub-THz imager with 100MHz resolution by CMOS direct-conversion receiver with on-chip circular-polarized SIW antenna

Author

Yang Shang ; Hao Yu ; Chang Yang ; Yuan Liang ; Wei Meng Lim

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

fYear

2014

fDate

15-17 Sept. 2014

Firstpage

1

Lastpage

4

Abstract

A 239-281GHz imager by direct-conversion receiver is demonstrated in 65nm CMOS process with high spectrum resolution and high sensitivity for sub-THz imaging. The sub-THz imager consists of a circular-polarized substrate integrated waveguide (SIW) antenna, down-conversion mixer and power gain amplifier (PGA). The SIW antenna is compact in area of 0.17mm² with -0.5dB gain and 32.1GHz bandwidth. The single-gate mixer can achieve 80GHz bandwidth centered at 260GHz with a conversion gain of -19dB. High resolution signal detection is achieved by a three-stage PGA with 150MHz bandwidth. The proposed sub-THz imager is fabricated with measurement results: -2dBi conversion gain over 42GHz bandwidth, -54.4dBm sensitivity with 100MHz detection resolution bandwidth, 6.6mW power consumption and 0.99mm² chip area. Moreover, frequency-dependent sub-THz images are demonstrated as well.

Keywords

CMOS integrated circuits; amplifiers; millimetre wave antennas; substrate integrated waveguides; CMOS direct-conversion receiver; CMOS process; bandwidth 150 MHz; bandwidth 32.1 GHz; bandwidth 42 GHz; bandwidth 80 GHz; circular-polarized substrate integrated waveguide; frequency 239 GHz to 281 GHz; gain -0.5 dB; gain -19 dB; on-chip circular-polarized SIW antenna; power 6.6 mW; power gain amplifier; size 65 nm; spectrum resolution; sub-THz imager; three-stage PGA; Antenna measurements; Bandwidth; CMOS integrated circuits; Image resolution; Mixers; Receiving antennas; CMOS 65nm; biomedical; high detection resolution; imaging; sub-terahertz; substrate integrated waveguide;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the

Conference_Location

San Jose, CA

Type

conf

DOI

10.1109/CICC.2014.6945986

Filename

6945986