In order to improve the output impedance of a current mirror emitter resistance are added to them..but on the other way these emitter resistances have certain drawbacks which involve restricting output voltage to a lower range etc..and then in order to nullify these disturbances cascode stages of transistors are required..which provides a much higher output impedances without large emitter voltage drops...
But how does cascode configuration improves output impedance to a higher level ???.........can't exactly imagine??
But how does cascode configuration improves output impedance to a higher level ???.........can't exactly imagine??
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