This work presents an ultra-compact single-antenna FD/FDD transceivers front-end. It comprises a nonreciprocal circulator, RX, and an integrated power amplifier (PA). In the proposed circulator, we devise a ring quarter-wave transmission line topology with adjusted characteristic impedances to improve TX-to-antenna insertion loss and TX-to-RX isolation. Besides, an AND-gate switching-based N-path filter is proposed to realize the circulator's nonreciprocal gyrator while acting as a mixer-first RX. Owing to the ultra-compact N-path filter structure, the circulator occupies only 0.38mm 2 core area. Over a 27.1-to-31.1GHz band, the realized front-end offers >20dB TX-to-RX isolation while its measured TX-to-antenna insertion loss is 1.7~2.2dB. The RX path tolerates the PA's blocker signal, achieving 5dBm in-band and 13dBm out-of-band B 1dB. Moreover, the PA delivers 15.15dBm peak output power with 33% drain efficiency. Our front-end prototype occupies only 0.7mm 2 , including circulator, PA, quadrature hybrid coupler LO generators, and baseband circuits.
|Title of host publication||Proceedings of the 2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)|
|Place of Publication||Danvers|
|Number of pages||4|
|Publication status||Published - 2022|
|Event||2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) - Denver, United States|
Duration: 19 Jun 2022 → 21 Jun 2022
|Name||Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium|
|Conference||2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)|
|Period||19/06/22 → 21/06/22|
Bibliographical noteGreen Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
- Blocker-tolerant receiver
- CMOS circulator
- N-path filter
- power amplifiers