Page 23 - Semester-IV-Electronics
P. 23

 When the input voltage is applied between inverting terminal and

                 ground terminal and then the positive terminal (non-inverting


                 terminal) is connected to the ground and the circuit is called inverting

                 amplifier.



             When inverting amplifier is grounded through Z and signal voltage
                                                                                                               1
                 is applied between non-inverting terminal and ground, then the

                 circuit is called non-inverting amplifier.



             Inverting Amplifier



                                                                                                                               4
             As the voltage gain of an OP-AMP is very high (-10 ) and the
                 maximum value of output voltage is 10V, so the potential difference

                 between the negative terminal G and ground terminal is very small,


                                                                -3
                 usually of the order of 10 V, i.e. V is almost zero.
                                                                                  1
             In other words, the point G inspite of not being connected to ground


                 can be assumed to be virtual ground apparently. Thus, current

                 flowing through Z is,
                                                    1




               =


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