Phase locked loop assisted fast start-up apparatus and method

An apparatus comprising:

• a phase locked loop (PLL) having a PLL oscillator;
• a resonator coupled to the PLL;
• and
• a circuitry to operate the PLL in an open loop and to inject energy from the PLL oscillator to the resonator during a configuration phase, and to operate the PLL in a closed loop after an impedance change of the resonator is detected.

A system comprising:

• a memory to store one or more instructions;
• a processor circuitry to execute the one or more instructions, the processor circuitry coupled to the memory;
• a wireless interface to allow the processor circuitry to communicate with another device,
• wherein the processor circuitry includes:
• a phase locked loop (PLL) coupled to a resonator;
• and
• a plurality of switches to operate the PLL in open loop during a configuration phase to determine a target oscillating frequency setting of the PLL,
• wherein the open loop of the PLL is coupled to the resonator to provide it with energy from an oscillator of the PLL during the configuration phase.