Sept22Lecture - Lecture Hiran Tennakoon ECSN 3.104 Sizing...

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Unformatted text preview: Lecture 09/22/2008 Hiran Tennakoon ECSN 3.104 Sizing of Inverter Chains Optimum beta ratio selection Optimum size ratio in chains driving large loads General Static CMOS Gates Layout issues Optimum Beta ratio Propagation times: ( 29 ( 29 -- +- = -- +- = 1 4 ln 2 1 4 ln 2 DD TP DD TP DD TP P PLH DD TN DD TN DD TN N PHL V V V V V V V V V V V V τ τ τ τ W P W N IN OUT C P C L V DD β = W P / W N = = L W C C L W C C P OX P OUT P N OX N OUT N μ τ μ τ Optimum Beta ratio (cont’d) ( 29 ( 29 -- +- + = -- +- + = + = 1 4 ln 2 1 4 ln 2 DD TP DD TP DD TP P OX P L P PLH DD TN DD TN DD TN N OX N L P PHL L P OUT V V V V V V L W C C C V V V V V V L W C C C C C C μ τ μ τ W P W N IN OUT C P C L V DD β = W P / W N Optimum Beta ratio (cont’d) ( 29 ( 29 -- +- + = -- +- + = + = 1 4 ln 2 1 4 ln 2 DD TP DD TP DD TP P OX P L P PLH DD TN DD TN DD TN N OX N L P PHL L P OUT V V V V V V L W C C C V V V V V V L W C C C C C C μ τ μ τ β = W P / W N W P W N IN OUT C P C L V DD Optimum Beta ratio (cont’d) + ′ = + ′ = P P L P PLH N N L P PHL W C C k W C C k μ τ μ τ β = W P / W N W P W N IN OUT C P C L V DD Optimum Beta ratio (cont’d) Both C IN and C P increase with size W Ratio of input capacitance and parasitic capacitance is a constant C P / C IN = K Gain: h = C L / C IN β = W P / W N C IN W P W N IN OUT C P C L V DD Optimum Beta ratio (cont’d)...
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This note was uploaded on 08/23/2009 for the course EE 6325 taught by Professor Vojin during the Fall '09 term at University of Texas at Dallas, Richardson.

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Sept22Lecture - Lecture Hiran Tennakoon ECSN 3.104 Sizing...

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