Noise in Single Stage Amplifier - Amplifier Fundamentals - Analog & Mixed VLSI Design

TL;DR

Study of noise calculation in single stage amplifiers to optimize performance.

Transcript

hello everyone in this lecture we will study about noise in single stage amplifier we will first describe the lemma that simplifies our noise calculation okay the circuit shown over here in figure a and b are equivalent at low frequencies such that b n square is equals to i n square upon g m square and these circuits are driven by a finite impedanc... Read More

Key Insights

• 🔂 Equivalent circuits simplify noise analysis for single stage amplifiers.
• 🍰 Short circuit currents and output impedances contribute to noise calculations.
• ⚡ Maximizing transconductance reduces input referred noise voltage.
• ℹ️ Minimizing transconductance in constant current sources optimizes amplifier performance.
• 🦻 MOSFET thermal noise technology aids in input referred noise voltage calculation for amplifiers.

Questions & Answers

Q: What is the significance of equivalent circuits in noise calculation for single stage amplifiers?

Equivalent circuits simplify noise analysis by allowing the examination of short circuit currents and output impedances for optimal performance.

Q: How does the input referred noise voltage affect the performance of a common source stage?

The input referred noise voltage can be reduced by maximizing the transconductance of the transistor, inversely proportional to the noise voltage.

Q: Why is it important to minimize the transconductance in a transistor operating as a constant current source?

Minimizing transconductance in a transistor as a constant current source helps reduce input referred noise voltage for improved amplifier performance.

Q: How can the input referred noise voltage be calculated using MOSFET thermal noise technology?

The input referred noise voltage can be calculated by considering MOSFET thermal noise and flicker noise components for optimization in single stage amplifier design.

Summary & Key Takeaways

• Introduction to noise calculation in single stage amplifiers.

• Explanation of equivalent circuits and short circuit currents.

• Analysis of input referred noise voltage in a common source stage.