108-316-and 220-290-GHz Ultrabroadband Distributed Frequency Doublers
- Authors
- Lee, Iljin; Kim, Younghwan; Jeon, Sanggeun
- Issue Date
- 3월-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Bandpass filter; broadband source; differential quasi-cascode pair; distributed structure; frequency doublers; millimeter-wave (mm-wave)
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.68, no.3, pp.1000 - 1011
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
- Volume
- 68
- Number
- 3
- Start Page
- 1000
- End Page
- 1011
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57387
- DOI
- 10.1109/TMTT.2019.2951105
- ISSN
- 0018-9480
- Abstract
- An analysis and design of distributed frequency doublers is presented at millimeter-wave (mm-wave) frequencies, including the D-, G-, and H-bands. The phase condition required for coherent output summation in the distributed multipliers is analyzed to maximize the output power and bandwidth. Based on the analysis, two mm-wave distributed frequency doublers are designed and experimentally demonstrated. The first doubler combines three unit cells in a distributed manner, while the insertion phase is equalized between the input and output artificial transmission lines (T-lines). A differential quasi-cascode structure is proposed for each unit cell, which enables the bandwidth extension and chip-size reduction. The differential doubler exhibits a measured peak output power and a conversion gain of 3.5 dBm and -2.5 dB, respectively, at the output frequency of 165 GHz. At 276 GHz, the output power and conversion gain are 1.6 dBm and -6.2 dB, respectively. The doubler maintains high output power above -5 dBm from 108 to 316 GHz, which covers almost the entire D-, G-, and H-bands. The second doubler combines five single-ended cascode unit cells to improve the output power and conversion gain. A bandpass filter is employed at the output T-line for spurious signal suppression. The single-ended doubler shows a measured peak output and conversion gain of 5.5 dBm and 0.3 dB, respectively, at 240 GHz. The bandwidth for -5-dBm output is from 220 to 290 GHz. Both doublers occupy a small chip area of 0.23 and 0.27 mm(2), respectively, including all probing pads.
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