Abstract: For ultra-high speed transmission system,the channel model becomes less than ideal,so it can extremely result in bad consequences by accessing signals that exceed the jitter tolerance.The jitter tolerance of different information transmission systems is also different.Most systems can not tolerate jitter beyond 0.5 UI,while some systems can transmit the signal with jitter beyond 1 UI.This requires that the bit error rate tester can generate a bad signal with controllable jitter frequency and amplitude in the evaluation of ultra-high speed transmission system.Traditional jitter injection method of adjusting data phase is difficult to exceed the range of 1 UI.In the article,we describe a method of inject variable parameter sinusoidal jitter signal for bit error rate tester.This method completed the jitter injection of the output signal by sinusoidal frequency modulation of input clock for the code generator.It achieved the injection effect of 0.1~10 UI jitter range,and has been successfully applied to a ultra-high speed bit error rate tester.

Key words: Ultra-high speed, Bit error rate, Test, Jitter injection, Frequency modulation