Parallel Testing of Phase-Locked Loop Lock Time In Production

Methods to accurately measure phase-locked loop lock time in multisite production environment has been presented and explained. The methods are applicable for testing transceiver frequency settling times, and frequency and phase errors after settling for multiple devices under test in parallel using on board frequency mixers and RF signal generators or using RF receivers of automated testers. Inverse FFT was used to measure the PLL lock time in a case when PLL frequency error exists