CAN I USE BFQ136 TRANSISTOR AS AN AMPLIFIER FOR THE FREEQUENCY RANGE ABOUT 13 MHZ?

I HAVE ITS DATA SHEET . THE TERMS IN ITS DATA SHEET ARE AS FOLLOWS,



transition frequency(fT) = 4.0 - GHz

CONDITIONS : IC = 500 mA; VCE = 15 V; f = 500 MHz; Tj = 25 °C;



please explain me about the term transition frequency.

is the transistor is suitable for 13 mhz operation?

 

That transistor is not at all suitable.

Take a look at the site - http://www.kenselectronics.com/lists/orig.htm - and find any transistor rated for the RF output of a CB radio. If it will work at 27 MHz, it will work at 13 MHz.

 

thanks beenthere ,

can you tell me whats the term transition frequency mean?

 

tell me how to choose a transistor based on the frequency of the circuit.
i mean, what factor in the data sheet is responsible for the frequency of operation?

 

Transition frequency has to do with junction capacitance - http://frank.mtsu.edu/~phys2020/Lectures/L19-L25/L21/Transition_Frequency/transition_frequency.html

In the case of a 2SC2075, for example, that figure is 100 MHz.

 

In a transistor, transition frequency is the frequency where the AC current gain (beta, hfe) equals one.

 

Whale, as beenthere said, a transistor with fT=4GHz will be unsuitable. It would be difficult to keep it from oscillating unless you really know what you are doing.