A Blocker-Tolerant Receiver Front End Employing Dual-Band N -Path Balun-LNA for 5G New Radio Cellular Applications
2021; IEEE Microwave Theory and Techniques Society; Volume: 70; Issue: 3 Linguagem: Inglês
10.1109/tmtt.2021.3136295
ISSN1557-9670
AutoresDonguk Shin, Kyudo Lee, Kuduck Kwon,
Tópico(s)Full-Duplex Wireless Communications
ResumoIn this article, a blocker-tolerant receiver (RX) front end employing a dual-band $N$ -path balun low-noise amplifier (balun-LNA) is presented for advanced cellular applications. The proposed RX front end can achieve a superior input-referred second-order intercept point (IIP2) performance without any IIP2 calibration, as the $N$ -path balun-LNA performs RF bandpass filtering and enhances blocker tolerance as well as the overall linearity of the RX. The proposed band-switchable differential inductor with a center tap enables the LC tank of the balun-LNA to support the operation of both low-band (LB) and mid-band (MB) frequencies for 5G new radio (NR) sub-6-GHz cellular applications. The RX front end is comprised of the dual-band $N$ -path balun-LNA, a $G_{m}$ -stage, current-mode passive mixers with a 25% duty-cycle local oscillator signal, current-mode passive RC low-pass filters, and transimpedance amplifiers. The RX front end was fabricated through a 65-nm CMOS process, and it was characterized primarily in the 5G NR LB and MB frequencies. The active die area was 2.24 mm 2 , and the RX front end drew a bias current of 15.1 mA from a nominal supply voltage of 1 V. It achieved a noise figure of 4.5 dB, a conversion gain of 43.5 dB, an out-of-band input-referred third-order intercept point of 7.89 dBm, and an IIP2 of more than 55 dBm.
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