CS Amplifier with Source Degeneration and Ohmic Load g = m G - - PowerPoint PPT Presentation

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IIT-Bombay Lecture 7 M. Shojaei Baghini

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CS Amplifier with Source Degeneration and Ohmic Load

( )

D m v S mb m m m

R G A R g g g G − = + + − = 1

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IIT-Bombay Lecture 7 M. Shojaei Baghini

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CS Amplifier with Source Degeneration and Ohmic Load (cont’d)

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IIT-Bombay Lecture 7 M. Shojaei Baghini

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( )

1 1 2 1

1 1

mb m m D m D m v

g g g R g R G A + + − = − =

Example

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IIT-Bombay Lecture 7 M. Shojaei Baghini

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CS Amplifier with Source Degeneration and Ohmic Load in the Presence of Body Effect and CLM

( )

S

• mb

m S

• m

m

R r g g R r r g G + + + × =

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IIT-Bombay Lecture 8 M. Shojaei Baghini

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Straightforward way without any intuition and understanding With intuition

I ∆

Output Impedance of CS Amplifier with SD

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IIT-Bombay Lecture 7 M. Shojaei Baghini

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Output Impedance and Gain of CS Amplifier with SD

I ∆ I V Rout ∆ ∆ =

( )

s

• mb

m

• S
• ut

R r g g r R R + + + = ⇒

s RS

R V I ∆ = ∆

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IIT-Bombay Lecture 8 M. Shojaei Baghini

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s mb m s mb s mb m m v

R g g R g R g g g A || 1 1 || 1 1 + = + + = ⇒

m mb

g g = η

Source Follower