Dal-Hwan Yoon, Long Chen, Teng Lian, Jong-Hwa Yoon, Jong-Uk Yoon
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Development of Zig System for Evaluating an Oscillator Performance
we have developed the Zig system for the voltage controlled crystal oscillator (VCXO) performance evaluation with positive emitter coupled logic(PECL). The VCXO is a crystal oscillator which includes a varactor diode and associated circuitry allowing the frequency to be changed by application of a voltage across that diode. The characteristics of the PECL has the delay time less than 2 ns and the faster logic gate, and the high level output greater than 2.3 V and the low level output smaller than 1.68 V.
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