deveshkm
Member level 4
Hi,
I have used the resistors from the foundry, in the schematic.
I used res_typical (typical process for a resistor) in model libraries in Analog Design Environment of Cadence Virtuoso
For various feedback resistors, ranging from 1k -150k , I observed no change in the equivalent input referred noise of the amplifier.
(Input referred noise stayed fixed at 500 nV/√Hz)
Using the formula : 4kTR ,for Resistor thermal noise due to 150k ,
noise by 150k resistor is around 50 nV/√Hz
Do feedback resistors in opamp contribute to noise ?
Is Noise contribution only by those components , which are on the signal path?
Thanks
I have used the resistors from the foundry, in the schematic.
I used res_typical (typical process for a resistor) in model libraries in Analog Design Environment of Cadence Virtuoso
For various feedback resistors, ranging from 1k -150k , I observed no change in the equivalent input referred noise of the amplifier.
(Input referred noise stayed fixed at 500 nV/√Hz)
Using the formula : 4kTR ,for Resistor thermal noise due to 150k ,
noise by 150k resistor is around 50 nV/√Hz
Do feedback resistors in opamp contribute to noise ?
Is Noise contribution only by those components , which are on the signal path?
Thanks