A 2-to-2.48GHz Voltage-Interpolator-Based Fractional-N Type-I Sampling PLL in 22nm FinFET Assisting Fast Crystal Startup

A high-performance clock generator with extremely low jitter, area, and power consumption is the key building block in the emerging Internet of Things (IoT) to connect billions of devices. Recently, digital phase-locked loops (DPLL) [1,2] have been developed to eliminate the bulky loop filter (LF) in type-II charge-pump PLLs. However, they suffer from quantization noise and spurs, requiring comple...