2-250 MHz Synthesized Network Analyzer
The basic analyzer uses two PLL’s mixed together to get a 2-250 MHz output. The PLL’s use Mini-Circuits VCO modules and Motorola MC145191 PLL chips to produce either a fixed 750 MHz or a variable 500-748 MHz output. These two PLL’s operate with a reference frequency of 100 kHz for excellent reference spur rejection and fast lockup times. The two PLL outputs are difference mixed and filtered to produce a 2-250 MHz output. The 1 Hz frequency resolution is achieved by driving the variable PLL’s reference input with the output of a Intersil HSP45102 NCO (Numerically Controlled Oscillator).
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