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RF power amplifier?????????

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Willem

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I am designing a power amplifier for between 1.7 and 1.8 GHz. I plan to use the BFG135A power transitor from Infineon. The thing I am interested in is the 1 dB compression point of this device. it is mentioned nowhere in the datasheet and I cant find it anywhere. My input signal power level is 25 dBm and I want 30 dBm out after the amplifier stage. But i want to know if the active device can handle the input power level and still give some gain.

Any help would be great.
 

vfone

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According to HB simulation for BFG135A the transistor reaches the maximum rating of collector current (150mA), at Pinp=25dBm (Vce=8V, f=1800MHz).
 

Willem

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Thanks, do you perhaps know of a power transistor that can handle an input power of more than 25 dBm? I want the device to take 25 dBm comfortably, so i cant really use the BFG135A then. I need some room to allow for signal fluctautions.

Any help?
 

xtasa

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Hello Willem,

I think that your choice of BFG135A transistor as power amp for that levels is not good. Please specify your requirements and VCC /I which you can use in amp than we can suggest you a much better solution maybe:?:.
GL XTASA
 

Willem

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My specs are as follows:

Frequency: 1787 MHz to 1797 MHz
Input power: +/- 25 dBm
Output power: +/- 30 dBm
Supply voltage = 9 - 15 Vdc

Any thoughts on which device will be suitable will be appreciated. This is my first time desiging a power amp so i dont know which devices are really used.
I prefer if it is a BJT. but if it is a FET is will be okay i guess.

Willem
 

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