Hi ,Is there any mosfet or BJT which could pass a high frequncy signal having 27MHZ frequency .I am trying with 2n2222 BJT but not getting the result i want to switch a 27MHZ sine wave on and off .The duty cycle shoud be 10%.
If I read that correctly, you want to switch a 27 MHz signal in about 4 nanoseconds. I really doubt that you will be able to do that with a discreet MOSFET.
The SN74LVC1G3157.PDF should be able to do it, though. They are about US $0.15 from my distributor, maybe more in developed countries.