Input referred Noise - Amplifier Fundamentals - Analog & Mixed VLSI Design

TL;DR

Input referred noise calculation for linear circuits using voltage and current sources.

Transcript

hello everyone in this video we will study about input referred noise now we model the input reference noise by both a series voltage source and a parallel current source as shown in figure below that the input reference noise can be represented by a parallel current source and it can be a series voltage source so that if the output impedance of th... Read More

Key Insights

• ⚡ Input referred noise in linear circuits can be represented by voltage and current sources.
• 🔠 Output impedance of the preceding stage affects the impact of input noise.
• 🔠 Equations for calculating input referred noise involve thermal noise and component values.
• 🔠 Neglecting flicker noise simplifies the calculation of input noise parameters.

Questions & Answers

Q: How is input referred noise modeled in linear circuits?

Input referred noise in linear circuits can be modeled using both a series voltage source and a parallel current source to represent the noise effectively.

Q: What factors affect the calculation of input referred noise voltage?

The calculation of input referred noise voltage depends on factors like the output impedance of the preceding stage and the presence of thermal noise in the components.

Q: Why is it essential to consider both input referred noise voltage and current?

Including both input referred noise voltage and current is necessary to comprehensively analyze and characterize the noise performance of linear circuits accurately.

Q: How can input referred noise be calculated in the case of a common source stage?

Input referred noise in a common source stage can be calculated by considering the thermal noise of the MOSFET and resistor, neglecting flicker noise, and using specific equations involving thermal noise parameters.

Summary & Key Takeaways

• Input referred noise can be modeled by both series voltage and parallel current sources in linear circuits.

• Input referred noise voltage and current are necessary to represent noise in linear circuits.

• Calculation of input referred noise voltage and current involves equations related to thermal noise and resistor values.