Name
Abstract | ||
|---|---|---|
A CMOS detector with a concurrent mode for high-quality images in the sub-terahertz region has been proposed. The detector improves output-signal coupling characteristics at the output node. A cross-coupling capacitor is added to isolate the DC bias between the drain and gate. The detector is designed to combine a 180° phase shift based on common source operation and an in-phase output signal based on the drain input. The circuit layout and phase shift occurring in the cross-coupled capacitor during phase coupling are verified using an EM simulation. The detector is fabricated using the TSMC 0.25-μm mixed-signal 1-poly 5-metal layer CMOS process, where the size, including the pad, is 1.13 mm × 0.74 mm. The detector IC comprises a folded dipole antenna, the proposed detector, a preamplifier, and a voltage buffer. Measurement results using a 200-GHz gyrotron source demonstrate that the proposed detector voltage responsivity is 14.13 MV/W with a noise-equivalent power of 34.42 pW/√Hz. The high detection performance helps resolve the 2-mm line width. The proposed detector exhibits a signal-to-noise ratio of 49 dB with regard to the THz imaging performance, which is 9 dB higher than that of the previous CMOS detector core circuits with gate-drain capacitors. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.3390/s22051753 | Sensors |
Keywords | DocType | Volume |
CMOS detector,concurrent-mode,differential detector IC,imaging SNR,integrated folded-dipole antenna,sub-terahertz imaging,voltage responsivity | Journal | 22 |
Issue | ISSN | Citations |
5 | 1424-8220 | 0 |
PageRank | References | Authors |
0.34 | 0 | 5 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Moon-Jeong Lee | 1 | 0 | 0.34 |
| Ha-Neul Lee | 2 | 0 | 0.34 |
| Ga-Eun Lee | 3 | 0 | 0.34 |
| Seong-Tae Han | 4 | 0 | 0.34 |
| Jong-Ryul Yang | 5 | 0 | 0.34 |