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该论文提出了一种采用二进制搜索辅助的两步注入技术的晶体振荡器，工作在12/13.56MHz，通过精确校准注入频率显著降低了启动能量和时间，解决了传统MHz范围晶体振荡器启动缓慢、功耗高的问题。
Instituto Superior Tecnico/University of Lisboa, Lisbon, Portugal 1 2 Startup time (ts) and energy (ES) of crystal oscillators (XO) determine the efficiency of ultra-low-power duty-cycled IoT radios. MHz-range XOs take a few milliseconds to reach the steady state without any startup aid [1-6], limiting the latency and average power of the radios. Injecting energy into the crystal can raise its motional current (iM) for ts and ES reduction, but only if the injection source’s frequency (finj) is close to the crystal’s series resonant frequency (fs). The two-step injection technique, which calibrates the injection source using the XO’s signal after the 1st injection, can safeguard finj for the 2nd injection [2,3]. Unfortunately, the phase-locked loop takes >1,000 cycles to calibrate in a closed-loop fashion, opposing the reduction of ts and ES. Figure 3.6.1 depicts the proposed 12/13.56MHz fast-startup XO incorporating a binarysearch-assisted two-step injection. To obtain fast frequency l
Haihua Li1, Ka-Meng Lei1, Pui-In Mak1, Rui P. Martins1,2
University of Macau, Macau, China