Operation of attached cascode current souce circuit.

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zoulzubazz

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The 5.1V zeners has low impedance and fixes the Vb and thus Ve voltages with 0.65V drop for Vbe.
Thus the voltage drop on the emitter resistors determines current limit.
The 2k R's supply current and Vin removes current thus modulating the output to load current as a voltage controlled current source
 
thanks mate, is there any reason power transistors cannot be used in this circuit to deliver a current of about 1A at about 10MHz to 15 MHz?
 

thanks mate, is there any reason power transistors cannot be used in this circuit to deliver a current of about 1A at about 10MHz to 15 MHz?

If the load resistance is 5K, Vin will be so 5kV ??? Are you sure that ???
 

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