TY - JOUR
T1 - 300-GHz Direct and Heterodyne Active Imagers Based on 0.13-μm SiGe HBT Technology
AU - Yoon, Dae Keun
AU - Kim, Jungsoo
AU - Yun, Jongwon
AU - Kaynak, Mehmet
AU - Tillack, Bernd
AU - Rieh, Jae Sung
PY - 2017/9/1
Y1 - 2017/9/1
N2 - 300-GHz direct and heterodyne imagers based on a 0.13-μm SiGe HBT technology were developed for active imaging applications in this work. The direct imager, which is based on the square-law principle, shows a maximum responsivity of 6121 V/W and a minimum noise equivalent power (NEP) of 21.2 pW/Hz1/2 at 315 GHz. The heterodyne imager, which consists of a mixer, a local oscillator, an IF amplifier, and an IF detector, exhibits a maximum responsivity of 322 kV/W and a minimum NEP of 3.9 pW/Hz1/2 at 300 GHz. Total dc power consumption of the direct imager is 0.6 mW, while the heterodyne imager consumes 21 mW. The chip areas of the direct and heterodyne imagers including the on-chip antenna are 460 × 410 and 610 × 610 μm2, respectively. To compare the performance of the two types of imagers for imaging applications, images from both imagers were acquired and compared with various output power levels of the signal source. It was demonstrated that the heterodyne imager shows much better image quality, especially when the signal source power is not sufficiently high.
AB - 300-GHz direct and heterodyne imagers based on a 0.13-μm SiGe HBT technology were developed for active imaging applications in this work. The direct imager, which is based on the square-law principle, shows a maximum responsivity of 6121 V/W and a minimum noise equivalent power (NEP) of 21.2 pW/Hz1/2 at 315 GHz. The heterodyne imager, which consists of a mixer, a local oscillator, an IF amplifier, and an IF detector, exhibits a maximum responsivity of 322 kV/W and a minimum NEP of 3.9 pW/Hz1/2 at 300 GHz. Total dc power consumption of the direct imager is 0.6 mW, while the heterodyne imager consumes 21 mW. The chip areas of the direct and heterodyne imagers including the on-chip antenna are 460 × 410 and 610 × 610 μm2, respectively. To compare the performance of the two types of imagers for imaging applications, images from both imagers were acquired and compared with various output power levels of the signal source. It was demonstrated that the heterodyne imager shows much better image quality, especially when the signal source power is not sufficiently high.
KW - Imaging
KW - Receivers
KW - Terahertz (THz)
UR - http://www.scopus.com/inward/record.url?scp=85023779533&partnerID=8YFLogxK
U2 - 10.1109/TTHZ.2017.2715419
DO - 10.1109/TTHZ.2017.2715419
M3 - Article
AN - SCOPUS:85023779533
VL - 7
SP - 536
EP - 545
JO - IEEE Transactions on Terahertz Science and Technology
JF - IEEE Transactions on Terahertz Science and Technology
SN - 2156-342X
IS - 5
M1 - 2715419
ER -