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A Ka-Band FMCW PLL Synthesizer with 8.5-GHz Bandwidth for High-Precision High-Resolution Sub-mmWave Radar Sensing
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- Authors
- Jayol Lee, Youngseok Baek, Iksoo Eo, Bontae Koo
- Issue Date
- 2021-05
- Citation
- International Symposium on Circuits and Systems (ISCAS) 2021, pp.1-5
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- A 31.4-39.9GHz mmWave PLL synthesizer for FMCW radar applications is proposed that consists of a complementary Colpitts-assisted class-B/C VCO, a programmable quadratic-curved charge pump, and a digital chirp-code generator. The complementary Colpitts oscillator is employed to supply more negative resistance around 40GHz. The charge pump produces quadratic-curved current to keep loop bandwidth constant. The fractional-N PLL synthesizer achieves locking range of 31.4-39.9GHz, a minimum FM rms error of 160 kHz, a high-speed chirp rate of 50μs, and a maximum FM modulation bandwidth of 8.5 GHz. The PLL implemented by using 65nm CMOS process accomplishes phase noise of -89dBc/Hz at 1MHz offset from 33.9GHz and consumes 60mW.
- KSP Keywords
- 5 GHz, 65nm CMOS, CMOS Process, Charge pump, Class B, Code Generator, Colpitts oscillator, FMCW Radar, Fractional-N PLL, High Speed, High resolution