A study of the effects limiting the responsivity of a broadband THz power detector with on-chip antenna in 0.13μm SiGe HBT technology
Shabanzadeh, Negar; Nokandi, Mostafa Jafari; Rasilainen, Kimmo; Chen, Jiangcheng; Singh, Sumit Pratap; Pärssinen, Aarno; Rahkonen, Timo (2022-11-08)
N. Shabanzadeh et al., "A Study of the Effects Limiting the Responsivity of A Broadband THz Power Detector with On-chip Antenna in 0.13μm SiGe HBT Technology," 2022 IEEE Nordic Circuits and Systems Conference (NorCAS), Oslo, Norway, 2022, pp. 1-5, doi: 10.1109/NorCAS57515.2022.9934190
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https://urn.fi/URN:NBN:fi-fe2023032332907
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Abstract
This paper presents a broadband THz power detector with on-chip antenna implemented in 0.13μm SiGe HBT technology. The detector has a center frequency of 280 GHz, bandwidth of 64 GHz and responsivity of about 1 A/W. The nonlinear response of the power detector is analyzed and un-desirable linearization effects are discussed. High DC current gain and low-impedance base biasing are shown to improve the conversion gain, but the dominant gain-reducing effect is the feedback from the emitter resistance. The dynamic range and noise sources are also explained.
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