Lecture31 Part 1 NMOSPMOSEquation_1

# Lecture31 Part 1 NMOSPMOSEquation_1 - SG |V tp | 2 Turn...

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NMOS & PMOS & CMOS I-V Equations Zubair Rehman EE 311 Lecture 31 Monday March 29, 2010

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2 Triode Region : v DS < v GS – V tn or v DS < V OV where = V OV = v GS – V tn i D = μ n C ox ( W / L ) n [(v GS - V tn )v DS - 1 / 2 v DS 2 ] Saturation Region : v DS > v GS - V tn or or v DS > V OV i D = [ μ n C ox /2] * ( W / L ) n [(v GS - V tn )] 2 NMOS I-V Equations (i D > 0 & v DS > 0)
3 Triode Region : v DS > v GS - V tp i D = - μ p C ox ( W / L ) p [(v GS - V tp )v DS - 1 / 2 v DS 2 ] Saturation Region : v DS < v GS - V tp i D = - 1 / 2 μ p C ox ( W / L ) p [(v GS - V tp )] 2 Note that i D is defined as positive when entering drain. PMOS I-V Equations (i D < 0 & v DS < 0)

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4 PMOS Equations for i D defined as leaving drain i D = i S v DS = - v SD v GS = - v SG V tp = - |V tp | Triode Region v DS > v GS - V tp - v SD > - v SG + |V tp | v SD < v SG - |V tp | or v SG > v SD + |V tp | i D = μ p C ox ( W / L ) p [(v SG - |V tp |)v SD - 1 / 2 v SD 2 ] Saturation Region v DS < v GS - V tp - v SD < - v SG + |V TP | v SD > v SG - |V tp | or v SG < v SD + |V tp | i D = 1 / 2 μ p C ox ( W / L ) p [(v
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Unformatted text preview: SG- |V tp |)] 2 Turn PMOS upside down; change definition of i D 5 CMOS Inverter NMOS : v GSN = v I & v DSN = v o Triode Region: v o < v I- V tn i DN = μ n C ox ( W / L ) n [(v I- V tn )v o- 1 / 2 v o 2 ] Saturation Region: v o > v I- V tn i DN = 1 / 2 μ n C ox ( W / L ) n [(v I- V tn )] 2 PMOS : v SG = V DD- v I v SD = V DD- v o Triode Region: V DD- v o < V DD- v I- |V tp | or v o > v I + |V tp | i DP = μ p C ox ( W / L ) p [(V DD- v I- |V tp |)(V DD- v o ) - 1 / 2 (V DD- v o ) 2 ] Saturation Region: V o < V I + |V tp | i DP = 1 / 2 μ p C ox ( W / L ) p [(V DD - v I- |V tp |)] 2...
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