how to calculate the frequency!

[aj_silverthunder]

1)guys how is the stability of this oscillator!
2)when i calculated the frequency i got 192Mhz...
but in the schematic its given 1Ghz..
i added the capacitance of D1(20pf),c2,c1,c3,c4 and calculated with L1!i got 192 Mhz....
am i wrong or the circuit designer is wrong please help me !

 

[JoannesPaulus]

Yeah, the designer is wrong, he used the correct formula... https://en.wikipedia.org/wiki/Clapp_oscillator

 

[aj_silverthunder]

u said the designer is wrong and also used the correct formula.
how is it!

 

[Audioguru]

You cannot calculate the frequency without including stray capacitance of the wiring which probably exceeds the capacitor values shown.

 

[E-design]

You're making a mistake somewhere.

Open loop & harmonic balance simulation confirms about 1GHz @ 2dBm level with values shown.

 

[aj_silverthunder]

can u tell me what is the value of C.the value of l1=18nH...but how do u calculate the value of C!