Besides the resistor, what kind of noise in double poly cap or MIM cap?
According to fluctuation-dissipation theorem in physics, thermal noise power spectral density is proportional to the real part of the impedance.
So, capacitors with zero series resistance do not generate thermal noise.
That being said - capacitors do accumulate noise form resistors they are connected to.
This noise is called kTC noise, and is very important in some electronic systems (for example - in image sensors, in switched capacitor filters, etc.).
Hi timof:
According to fluctuation-dissipation theorem in physics, thermal noise power spectral density is proportional to the real part of the impedance.
So, capacitors with zero series resistance do not generate thermal noise.
That being said - capacitors do accumulate noise form resistors they are connected to.
This noise is called kTC noise, and is very important in some electronic systems (for example - in image sensors, in switched capacitor filters, etc.).
==>do you mean the KTC noise of the capacitor that from the resistors when the capacitor and resistor connect together(parallel or serial)?
Each kind of capacitor type (like MIM Cap, POP cap) has this phenomenon?
mpig
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Hi all:
Is there any noise depend on the area of resistor and capacitor in VLSI?
Like poly resistor, nwell resistor / POP Cap, MIM cap...
mpig
Yes, the noise is generated by thermal noise from the resistance in the circuit....................==>do you mean the KTC noise of the capacitor that from the resistors when the capacitor and resistor connect together(parallel or serial)?
Each kind of capacitor type (like MIM Cap, POP cap) has this phenomenon?...........
Spectral power density of thermal noise generated by resistor R is: P=4kTR...
Thermal noise is generated by any circuit element - not only resistor - that has a non-zero real part of the complex impedance.
Hence, capacitor or inductor with zero series resistance do not generate thermal noise themselves.
Spectral power density of thermal noise generated by resistor R is: P=4kTR.
kTC is a fundamental physical effect, and does not depend on the structure or nature of the capacitor - MIM, MOM, poly-poly, MOS, ...
kTC noise is accumulated on a capacitor when it is connected to a resistor in parallel, or charged from a battery through a resistor.
If capacitor is connected to resistor in series, and they are not connected to anything - there is no noise on capacitor (if its initial charge, before connecting to a resistor in series, is zero, it will stay exactly at zero, doe to charge conservation law).
2. I don't quite understand this question.
If a resistor is connected in parallel to capacitor, or capacitor is connected to a battery through a resistor - is there a path between C and R? I guess, yes, there is a path, with zero resistance, but how do you use that info?
==>Does it mean the resistor is easy to show two noise mechanisms: thermal noise、1/f noise?Extra questions:
2. Depending on the material structure and carrier transport details, resistors can display noise mechanisms other than thermal noise - like 1/f noise, etc.
==>whether the connection of the resistor and capacitor is parallel or serial, the phenomenon is the same?If you repeat connection/disconnection many times, each time the final (fixed) voltage on the capacitor will be different, with the average value of the square of the voltage equal to kT/C.
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