A -247.1 dB FoM, -77.9dBc Reference Spur Ring-Oscillator-Based Injection-Locked Clock Multiplier with Multi-Phase-Based Calibration. - Yeonggeun Song; Kyoungjoon Ha; Han-Gon Ko; Min-Seong Choo; Deog-Kyoon Jeong (ESSCIRC, 2022)