Zuow-Zun Chen, Yilei Li, Yen-Cheng Kuan, B. Hu, C. Wong, Mau-Chung Frank Chang
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Digital PLL for phase noise cancellation in ring oscillator-based I/Q receivers
A digital phase noise cancellation technique for ring oscillator-based I/Q receivers is presented. Ring oscillator phase noise, including supply-induced phase noise, is extracted from digital phase-locked loop (DPLL) and used to restore the randomly rotated baseband signal in digital domain. The receiver prototype fabricated in 65nm CMOS technology achieves phase noise reduction from -88 to -109dBc/Hz at 1MHz offset, and an integrated phase noise (IPN) reduction from -16.8 to -34.6dBc, when operating at 2.4GHz.
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