Evaluation of Injection Pulling/Locking of VCO by Using IEC Electromagnetic Susceptibility Tests

The IC stripline, an IEC radiated electromagnetic susceptibility (EMS) method, is utilized for evaluating the injection pulling and locking effects of the voltage-controlled oscillator (VCO). An IC stripline with the bandwidth of 2.5 GHz is realized and the test setup is built. A commercial VCO is tested for demonstration. Another IEC conducted EMS test, direct power injection, is also performed for comparison. The results show the effectiveness of characterizing injection pulling and locking of VCO by using the proposed solution.