I encountered a problem where it was asking to build two amplifiers. One of them must be inverting and the other one must be non-inverting amplifier. The problem was also telling that both of the amplifiers must have a gain of 5. I can manage to design the non-inverting amplifier to have a gain of 5. However I am a bit confused whether the problem asks me to build an inverting amplifier having a gain of 5 or -5? Please help I also attach the problem

 

hi Alex.
Welcome to AAC.
Do you know the equations for the Gain of Inverting and Non Inverting OPA's.???
E

 

Yes I know them. For inverting amplifier: Vout/Vin=Gain=-Rf/Rin and for non-inverting amplifier:Vout/Vin=Gain=1+R2/R1. However, If I have an inverting amplifier, the input voltage polarities will change for the output with a gain for a simple inverting amplifier. The question says the amplifier gain should be 5. Is it 5 or -5 ?

 

hi Alex.
Welcome to AAC.
Do you know the equations for the Gain of Inverting and Non Inverting OPA's.???
E

Hi by the way

 

The magnitude of the inverting gain is 5, but for the equation it's -5 (meaning it's inverting).

 

The magnitude of the inverting gain is 5, but for the equation it's -5 (meaning it's inverting).

Thank you so much for your help! Love this platform!

 

hi A,
So knowing that NI OPA equation, post what you think the amplifier circuit will be.
E