115C_1_ee115c_03

115C_1_ee115c_03 - Transistor Resistance 1 The Transistor...

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1 Transistor Resistance
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2 The Transistor as a Switched Resistor V GS V T SD R on () + + + = 2 1 2 1 2 1 DD DSAT DD DD DSAT DD eq V I V V I V R λ DD DSAT DD eq V I V R 6 5 1 4 3 I D V DS V DD V DD /2 V GS = V DD R mid R 0 0 2 1 R R R mid eq + =
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3 Variable Resistance of a Transistor Equivalent resistance can also be obtained by a simulation. 0.5 1 1.5 2 2.5 0 1 2 3 4 5 6 7 x 10 5 V DD (V) R eq (Ohm) W / L =1, L =0.25 μ m
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4 R eq for a Different Condition 0 0.5 1 1.5 2 2.5 0 1 2 4 5 6 x 10 -4 V GS (V) I D (A) 3 () 2 1 22 DD eq DSAT GS VV R IV V V =⋅ + ==
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5 Transistor Capacitance
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6 Two Views of a Transistor t ox n + n + Cross section L Gate oxide x d x d L d Polysilicon gate Top view Gate-bulk overlap Source n + Drain n + W
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7 MOS Capacitances C 1 -C 4 - gate capacitances C j -- are junction capacitances L S D W G C 1 C 2 C 3 C 4 C jSB C jDB L D j x
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8 Channel Charge D C DB C SB C GS C GD GB S C GB OFF (DEPLETION) OFF (ACCUMULATION)
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115C_1_ee115c_03 - Transistor Resistance 1 The Transistor...

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