PLL or Phase Locked Loop is a common term in electronics and telecommunications engineering, but it can be challenging to find synonyms for this term. However, there are a few relevant phrases and terms that are related to PLL. Firstly, Frequency Synthesizer refers to a circuit that generates a precise and highly stable frequency using a PLL. Secondly, Clock Recovery is a process that extracts timing reference from a digital data stream using a PLL. Additionally, VCO or Voltage Controlled Oscillator is a critical component in a PLL circuit that generates a fixed-frequency output by varying its input voltage. Finally, some technical jargon that may be useful are feedback loop, phase detector, and frequency divider.