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EE 435 Lect 4 Spring 2010

EE 435 Lect 4 Spring 2010 - EE 435 Lecture 4 Fully...

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1 EE 435 Lecture 4 Fully Differential Single-Stage Amplifier Design
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2 Design Space Exploration Question: How does the GB of the modified single-stage amplifier change with bias current? = EB DQ L V I C GB 2 3 2 OX DD DQ L C WP LV GB I C μ = 2 1 OX L DQ C W P GB C L I μ = Increases Linearly Increases Quadratically Decreases Linearly Decreases Quadradicly Independent of I DQ It depends upon how the design space is explored !!! OX DQ L 2 μ C W GB = I C L DD L EB 2 P GB= V C V ⎤ ⎡ ⎥ ⎢ ⎦ ⎣ Review from last lecture:
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3 Design With the Basic Amplifier Structure Consider basic op amp structure V EB = -V SS -V T GB varies linearly with P ! GB is very costly ! If gain is adequate, designer got “lucky” but GB can be engineered { } EB P,V V0 EB 2 1 A = λ V DD L EB 2 P GB= V C V ⎤ ⎡ ⎥ ⎢ ⎦ ⎣ Review from last lecture:
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4 Design space is often a high-dimensional system with many local extrema (minimums or maximums) Be careful about drawing conclusions about how any parameter individually affects system performance because its affect will depend upon how the design space is explored Review from last lecture:
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