In an op-amp, the input impedance is _______ and the output impedance is _______.

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. high; high
  2. low; low
  3. low; high
  4. high; low

Answer (Detailed Solution Below)

Option 4 : high; low
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Operational Amplifier (OP-AMP)

F4 Vinanti Engineering 06.02.23 D2

An operational amplifier (op-amp) is an integrated circuit (IC) that amplifies the difference in voltage between two inputs. 

It has two terminals i.e. inverting and non-inverting terminals.

The output of the OP-AMP is:

\(V_{OUT}=A_V({V_{NI}-V_I})\)

Properties of OP-AMP

  • High input impedance
  • Low output impedance
  • High CMRR
  • High gain
  • High slew rate
  • Low input offset voltage
  • High bandwidth
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