Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 53, Issue 12, Pages 3599-3612Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2018.2878817
Keywords
3-push Colpitts oscillator; near-field array; near-field scanning optical microscopy (NSOM); power detector; SiGe heterojunction bipolar transistor (HBT); split-ring resonator (SRR); super-resolution imaging; system-on-a-chip (SoC); terahertz
Categories
Funding
- German Research Foundation [SPP 1857]
Ask authors/readers for more resources
This paper presents a fully integrated system-on-achip for real-time terahertz super-resolution near-field imaging. The chip consists of 128 sensing pixels with individual crossbridged double 3-D split-ring resonators arranged in a 3.2 mm long 2 x 64 1-D array. It is implemented in 0.13-mu m SiGe bipolar complementary metal-oxide-semiconductor technology and operated at around 550 GHz. All the functions, including sensor illumination, near-field sensing, and detection, are co-integrated with a readout integrated circuit for real-time image acquisition. The pixels exhibit a permittivity-based imaging contrast with a worst case estimated relative permittivity uncertainty of 0.33 and 10-12-mu m spatial resolution. The sensor illumination is provided with on-chip oscillators feeding four-way equal power divider networks to enable an effective pixel pitch of 25 mu m and a dense fill factor of 48% for the 1-D sensing area. The oscillators are equipped with electronic chopping to avoid 1/f -noise-related desensitization for the SiGe-heterojunction bipolar transistor power detectors integrated at each pixel. The chip features both an analog readout mode and a lock-in-amplifier-based digital readout mode. In the analog readout mode, the measured dynamic range (DR) is 63.8 dB for a 1-ms integration time at an external lock-in amplifier. The digital readout mode achieves a DR of 38.5 dB at 28 f/s. The chip consumes 37-104 mW of power and is packaged into a compact imaging module. This paper further demonstrates real-time acquisition of 2-D terahertz super-resolution images of a nickel mesh with 50-mu m feature size, as well as a biometric human fingerprint.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available