Quadrupler Design for Millimeter-Wave Radar Frequency Source
Based on the SMIC 55 nm CMOS process,a quadrupler is designed which is for the use of millimeter-wave FMCW radar frequency sources.The quadrupler consists of a cascaded topology of doubler stages with the doubler core utilizing the Push-Push topology.The magnetic-coupled resona-tors(MCR)for matching the input impedance while achieving single-ended to differential conversion and harmonic suppression functionalities.Meanwhile,a harmonic suppression structure is proposed,combining a bandpass structure with MCR to achieve inter-stage matching and output power matc-hing,meeting the requirements for harmonic suppression and higher output power.The design results demonstrate that within the output frequency range of 60 GHz～64 GHz,the quadrupler achieves a saturated output power of 2.2 dBm with harmonic suppression greater than 35 dBc and a DC power consumption of 59 mW.This quadrupler exhibits high harmonic suppression and high output power under the premise of satisfying the wide octave range,making it suitable for frequency source genera-tion circuits in millimeter-wave radar systems.
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