INVERTING AND NON INVERTING AMPLIFIERS

1) Inverting amplifier




        In this mode the positive input terminal of the amplifier is grounded and the input signal is applied to the negative input terminal through resistor R .The feedback applied through a resistor from output to the input terminal is negative.

2) Non inverting amplifier





        In this mode the negative input terminal of the input is grounded and the input signal is applied to the positive input terminal through R. The feed back applied through a resistor from output to input terminal is negative.


1.    Gain of the inverting amplifier

     A   = -Rf / Ri
                        V0 = -Avin
                                               V0 / Vin      = -Rf / Ri   ---------------------------- (1)
                                   Assume             A   = 2,
                                   Input voltage   Vin = 1Volts
                                                            R1   = 10 KΩ
Substitute all values in equation (1) and find Rf value.

2.    Gain of the non – inverting amplifier

  Vo / Vin =    (Rf + Ri) / Ri.
                                             A   = 1 + Rf/Ri ----------------- (2)
                                           Assume               A   = 2,
                                                 Input voltage   Vin   = 1Volts
                                                           Rin =    R1     = 10 KΩ

Substitute all values in equation (2) and find Rf value.



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1 comment:

  1. Elizabeth J. NealDecember 27, 2014 at 9:21 PM

    The feed back applied through a resistor from output to input terminal is negative. Ev Sineması

    ReplyDelete

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