A 0.32 THz SiGe 4x4 Imaging Array Using High-Efficiency On-Chip Antennas

作者：Uzunkol Mehmet^*; Gurbuz Ozan D; Golcuk Fatih; Rebeiz Gabriel M

来源：IEEE Journal of Solid-State Circuits, 2013, 48(9): 2056-2066.

DOI：10.1109/JSSC.2013.2262739

• Direct detector
• imaging array
• millimeter-wave imaging
• NEP
• responsivity
• SiGe
• terahertz

This paper presents a 0.32 THz 4x4 imaging array based on an advanced SiGe technology. Each pixel is composed of a high efficiency on-chip antenna meeting all metal-density rules, which is coupled to a SiGe detector and a low noise CMOS operational amplifier. A quartz superstrate is used on top of the imaging chip to improve the radiation efficiency. The array results in an average NEP of 34 pW/Hz(1/2) at an IF of 10-100 kHz for a detector bias current of 50-150 mu A, a responsivity of 18 kV/W and a 3-dB bandwidth of 25 GHz. The power consumption is 2.4 mW/pixel. Extensive measurements are presented which show the challenges encountered in obtaining accurate measurements at THz frequencies using a quasi-optical set-up, and the decisions taken to quote the average NEP values.

• 出版日期2013-9