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The relationship of Amplifier vs Power vs Frequency


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Hi Walid,
Small signal transistors like the 2N3904 and BC547 have a frequency response up to 300MHz, so stray circuit capacitance limits their high frequency response if the resistors have a high value.

Power transistors like the old 2N3055 have a poor high frequency response which is extended with negative feedback.

I have never designed a high frequency radio amplifier and I can't remember what was taught many years ago.

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