[SOLVED] opamp- basic operation

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kdg007

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I am trying to understand the basic operation of the OP-amp.
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i know the difference between inverting and non-inverting op-amps.but why do we need inverting op-amps ?
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**broken link removed**
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can anyone explain me whats happening in this circuit ? why cant i kept just one opamp (non-inverting to get the desired signal ) ?
 

Hello my friend
It is very simple. The op amp "A" is at non inverting arrangement . I think with this consideration . you can guess , the behavior of this circuit. (the gain of stage A = 1+R3/R4)
Best Wishes
Goldsmith
 
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    kdg007

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Thank you fo rthe reply,

so the op-amp A is used only to increase the gain ? then what is the purpose of op-amp B ?
 

The R1 Is the input impedance of op amp B . do you know how? if you know , we can going head , to analyze the circuit. ( i want that you try)
Regards
Goldsmith
 
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    kdg007

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op-amp B is a inverting opamp.. so the gain at output will be Vout = (V+-V-)A
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also the waveform will be inverted... am i right ?

---------- Post added at 14:50 ---------- Previous post was at 14:49 ----------

the output of Opamp A will become the input of Opamp B through the resistor R1.
 

kdg007 said:
Thank you fo rthe reply,

so the op-amp A is used only to increase the gain ? then what is the purpose of op-amp B ?
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Such a combination of two opamps is used frequently to combine some advantages of two different technologies (composite amplifier configuration).
In this case, however, two identical units are used because of noise properties (as mentioned in the text). The first unit is non-inverting and the second one is required to be inverting because of overall negative feedback. As you (should) know - negative feedback always is used to improve and fix amplifier characteristics.
 
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