OPAMP İnverting Amplifiers
in the inverting amplifier circuit, the opamp connected 2 resistors
input signal (-) is applied inseries with R1 and the output is connected to the inverting input through Rf
(+) pin is connected to the Ground. and (-) pin is used as input signal.
and so obtain 180 degrees phase differencies.
couse of the input impedance is very high, the current that flows on amplifier is very small, and according to I1 and If , the current can neglect.
and therefore we can say:
I1=If
and
and therefore can be written;
in the opamps the gain is very high, so
Vo=-Av.V1
and can accept V1=0
therefore, can be prove
if Rı = R2
in this case The gain is "1".
Note that the voltage at the inverting input is zero, the input signalwill see aninput impedance equal toR1, or 1K.
For more high input impedances, the values both two resistor can be increased.
Keywords :
Opamp,
Op-amp,
Amplifiers,
Inverting,
Amplificator,
Amplification,
Info,
Tutorial
Writer : delon |
18 Apr 2006 Tue  
| 8.919 Views