AC(Sine) Signal Amplifier

[bragas]

Hi All,

I have a 1V 50kHz sine signal source and i want to amplify this signal to 50V 1A sine signal source using BJT's. Can you suggest me an amplifier circuit, which topology is suitable for this amplification? Thanks.

 

[D.A.(Tony)Stewart]

50W Class A Darlington will be ~ 60% efficient with transformer or L with C coupling, tuned to f. Choose Q for 50R.
... but this is distorted.... due to variation in hFE with I. So depends on needs.

thus use gain 50x and complementary x1 buffer. Does it need to be 50R output impedance? if so then V+=100V


For low distortion use 2 stage complementary cascode with feedback to control gain and linearity. GBW is only 500kHz.


Size heatsink and cpu fan accordingly.

 

[D.A.(Tony)Stewart]

Build this

Or simply by the OPA541.