A 24-GHz RF Transmitter in 65-nm CMOS for In-Cabin Radar Applications

A 24-GHz direct-conversion transmitter is proposed for in-cabin radar applications. The proposed RF transmitter consists of an I/Q up-conversion mixer, an I/Q local (LO) oscillator generator, and a power amplifier. To improve the linearity of the I/Q up-conversion mixer, an inverter transconductor w...

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Veröffentlicht in:Electronics (Basel) 2020-12, Vol.9 (12), p.2005
Hauptverfasser: Lee, Suyeon, Jeon, Yangji, Park, Geonwoo, Myung, Jinman, Lee, Seungjik, Lee, Ockgoo, Moon, Hyunwon, Nam, Ilku
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Sprache:eng
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Zusammenfassung:A 24-GHz direct-conversion transmitter is proposed for in-cabin radar applications. The proposed RF transmitter consists of an I/Q up-conversion mixer, an I/Q local (LO) oscillator generator, and a power amplifier. To improve the linearity of the I/Q up-conversion mixer, an inverter transconductor with third-order intermodulation (IM3) distortion cancellation is proposed. To improve the I/Q balancing performance of the I/Q LO generator, a poly-phase filter, including parasitic line inductance, is proposed. By employing a highly linear I/Q up-conversion mixer and a balanced I/Q LO generator, the 24-GHz direct-conversion transmitter achieves high linearity and I/Q balancing characteristics. It is fabricated in a 65-nm CMOS process and consumes 150 mW. It shows an OP1dB of 8.6 dBm, an LO leakage of −48 dBc, and an image rejection ratio of −49 dBc for the entire operating band from 24 GHz to 24.5 GHz.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics9122005