Block Diagram of Local Oscillators

Frequency-IF	Oscillator	multiplier A	multiplier B	multiplier C
902-28	109.250	X2=218.5	X2=437	X2=874
1296-28	105.666	X2=211.333	X2=422.666	X3=1268
1296-144	96.000	X2=192	X2=384	X3=1152
2304-28	94.833	X2=189.666	X3=569	X4=2276
2304-144	90.000	X2=180	X3=540	X4=2160

Local oscillators are used to up & down convert signals at virtually any frequency. The purity of these signals must be good otherwise un-wanted signals can be converted and mixed with the desired signals. The local oscillator designs presented here are very clean and when used inconjunction with a well filtered receiver front end will give unparalleled performance.

The following LOs are easy to build and offer versatility in that the individual stages can be used in other configurations and applications without problems. All stages are 50 Ohm input and output impedances. The various multipliers can be trusted for their stability and purity.

These application notes were originally presented at the 1995 MicroWave Update in Dallas, TX.

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