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The increasing demand for multi-band applications, including the 5G (FR1 and FR2), 6G, and WiFi, covers a frequency range from 0. 45 to 40GHz. To meet specific requirements of different standards, various wideband receivers are developed 1–3. In 1 and 2, the harmonic selection technique and wideband LNA are introduced to achieve wideband receiver covering the 5G FR2 band, respectively. However, to satisfy the sub-6G operation, the receiver covering the 0. 45-6GHz is required, which desires a high f₇₈₆₇/f₋₎ₖ ratio of 13. 3 and is not easy to implement using on-chip transformer-based matching. Then, the resistive-load method is used for the high f₇₈₆₇/f₋₎ₖ receiver design 3. In this way, a 0. 4-6GHz receiver is achieved. However, the mm-wave band performance is limited by the circuit parasitic. To cover both the mm-wave band and sub-6G, numerous receiver channels are used 4. As shown in Fig. 1, the communication band selection is implemented by the SPNT on RF path, which increases the NF. Besides, a wideband LO coverage range is required, which increases the power consumption of the LO generation network. This work introduces a 0. 3-40GHz hybrid-path band-selection receiver. The receiver supports 40MHz and 50MHz 4096-QAM modulation at 2. 4 and 3. 5GHz, while a 1. 2GHz 64-QAM modulation at 18GHz is achieved. The receiver also achieves the 400MHz 256-QAM at 24, 28, 37, and 39GHz, respectively.
Han et al. (Sun,) studied this question.