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Andy aka
Andy aka
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You have situation ofYour circuit is an amplifier (Q2) with high open-loop voltage gain and strong negative feedback back (via Q1) back to theits input: -

enter image description here

This means that the input impedance will be very low because it now behaves like a virtual ground (as per classic op-amp theory). None of these transistors are in common-base by the way.

You have situation of an amplifier (Q2) with high open-loop voltage gain and strong negative feedback back (via Q1) to the input: -

enter image description here

This means that the input impedance will be very low because it now behaves like a virtual ground (as per classic op-amp theory). None of these transistors are in common-base by the way.

Your circuit is an amplifier (Q2) with high open-loop voltage gain and strong negative feedback back (via Q1) back to its input: -

enter image description here

This means that the input impedance will be very low because it now behaves like a virtual ground (as per classic op-amp theory). None of these transistors are in common-base by the way.

Source Link
Andy aka
Andy aka
  • 473.1k
  • 29
  • 383
  • 839

You have situation of an amplifier (Q2) with high open-loop voltage gain and strong negative feedback back (via Q1) to the input: -

enter image description here

This means that the input impedance will be very low because it now behaves like a virtual ground (as per classic op-amp theory). None of these transistors are in common-base by the way.