victoria256
Newbie
Hello everyone!
I’m trying to solve a problem that asks for the total noise spectral density observed at the output of an operational amplifier. I have some questions regarding the calculation and would appreciate some help.
Regarding the bias current noise of the operational amplifier, should I consider both resistors in the circuit (R1 and R2) when calculating the input current error? Or should I treat each resistor separately
I’m using the following formula to calculate the total noise spectral density:SV(f)total=√(en)2+(iner1×R1)2+(iner2×R2)2+4.1×√R11k+4.1×√R21kSV(f)total=(en)2+(iner1×R1)2+(iner2×R2)2+4.1×R11k+4.1×R21k
But I'm not sure if im doing correctly the analysis. The problem provides the values for the input voltage noise (En=7.9nV/sqrt(Hz)) and input current noise (in=0.5fV/sqrt(Hz)), that 4.1 is the spectral density for 1kΩ in 1 hz, and also mentions that the BW=100Hz.
Could anyone confirm if my approach is correct, or if there’s anything I should adjust?
Thanks in advance for your help!
I’m trying to solve a problem that asks for the total noise spectral density observed at the output of an operational amplifier. I have some questions regarding the calculation and would appreciate some help.
Regarding the bias current noise of the operational amplifier, should I consider both resistors in the circuit (R1 and R2) when calculating the input current error? Or should I treat each resistor separately
I’m using the following formula to calculate the total noise spectral density:SV(f)total=√(en)2+(iner1×R1)2+(iner2×R2)2+4.1×√R11k+4.1×√R21kSV(f)total=(en)2+(iner1×R1)2+(iner2×R2)2+4.1×R11k+4.1×R21k
But I'm not sure if im doing correctly the analysis. The problem provides the values for the input voltage noise (En=7.9nV/sqrt(Hz)) and input current noise (in=0.5fV/sqrt(Hz)), that 4.1 is the spectral density for 1kΩ in 1 hz, and also mentions that the BW=100Hz.
Could anyone confirm if my approach is correct, or if there’s anything I should adjust?
Thanks in advance for your help!
