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How to make this oscillator work at 95Mhz

时间:04-10 整理:3721RD 点击:
can this circuit work as an oscillator
i simulated it and it worked correctly at 95 Mhz but when i tested it it gives me 1.27Ghz
can it be modified to 95Mhz

Circuit is an oscillator. Base emitter capacitor 300pF is unusual.What do you mean by tested? What kind of transistor is NS3904? Is it 2N3904?

it is2n3904 and i implemented it (tested it practically)
how it gave 1.27GHZ?

2N3904 is a 100MHz transistor.
http://www.fairchildsemi.com/ds/2N/2N3904.pdf
and it is almost impossible to oscillate at 1.27GHz.

One thing could happen. The circuit is oscillating somewhere close to 100MHz, and if you are using a frequency counter to measure the frequency, for some reasons this one is picking up the 12 harmonic. Sound crazy but it is a possibility.
The best is to use an oscilloscope for measurement.

i used spectruma analyzer to view the results
i first used 3904 and it gives 630 MHZ
then i replaced it by 9018 then it gave 1.27 Ghz (fundamental)and i couldnot seee the harmonics because the spectrum max was 3 Ghz

9018 is already a different story. This is for Local Oscillators at 1.1GHz.
http://www.fairchildsemi.com/ds/SS/SS9018.pdf

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