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Explain i/p referred noise voltage of CS

Subject: CMOS VLSI Design

Topic: Single Stage Amplifier

Difficulty: Medium

1 Answer
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Input reffered noise voltage of CS Stage,

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  • we model the thermal and flicker noise of m_1 by 2 current sources.

    ¯I2n,th=4KT(2/3)gm

    ¯I2n,1/f=Kgm2COXWLf

  • Thermal noise of RD by current source,
    ¯I2n,RD=4KTRD


The output noise voltage per unit BW=

¯V2n,out=(4KT(2/3)gm+KCOXWL1fgm2+4KTRD)R2D -(1)

We have, ¯V2n,in=¯V2n,outA2v
=(4KT(2/3)gm+KCOXWL1fgm2+4KTRD)R2Dgm2R2D

¯V2n,in=4KT(23)1gm+KCOXWL1fgm+4KTRDgm2 -(2)

Eq (1) -> output noise voltage of CS stage.
Eq (2) -> input noise voltage of CS stage.

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