phase locked loop pll oscillator


Posted on Feb 7, 2014

This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining request frequency value by patching. TC5081AP is phase comparator and TC5082P is binary counter f


phase locked loop pll oscillator
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or 2048 dividing. TC5082P has also been consited of Xtal oscillator circuit. 12. 8MHz is divided by 2048 into 6. 25Khz. MB501 is a 64 dividing prescaler You must patch the input of TC9122P for 2150, and 6. 25kHz*2150*64 comes to 860MHz. Parts VCO made by MURATA as MQC-302-856. The loop filter is simple lag-lead filter The output RF signal is boosted by MMIC. The uPC1675G is not suitable for this level, you may use MAR-3 instead. Because the uPC1675G`s PiMAX is 0dBm and then Po:4dBm, MQC-302-856`s output of 1dBm. is over power. If you use MAR-3 instead you will get 11dBm of RF output. I would like to use this LO for 1200 MHz to 435 MHz converter and combining with TUF-5 DBM. TUF-5 asks +7. 5dBm LO input for MAX conversion gain. And on the input of DBM there should be placed PAD for decreasing distortion. 11dBm output level is adequate, so I think.




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