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Published byDalia Lardner Modified about 1 year ago

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Prinsipp for transistor i D = (15 V)/(1000 Ω) =15 mA i D = (0 V)/(1000 Ω) = 0 ”load line”

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JFET (Junction Field Effect Transistor)

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xx+dx

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JFET (Junction Field Effect Transistor)

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Figure 6.7 MESFET (Metal Semiconductor Field Effect Transistor )

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MOSFET (Metal Oxide Semiconductor Field Effect Transistor )

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MOSFET

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Ulike typer av MOSFET

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Likevekt Ansamling av hull Deplesjon av hull Ansamling av elektroner V=0 V>0 V<0V>>0

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Q m = | Q d + Q n | V = V G = V i + Φ s

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Figure 6.17Figure 6.18 Terskelspenning V T i virkeligheten; m s m < s

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V T i virkeligheten; ladninger i gate-oksiden

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MOSFET (Metal Oxide Semiconductor Field Effect Transistor )

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Ei∞Ei∞ qΦ(x) = E i ∞ - E i (x)

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MOSFET

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V T i virkeligheten Figure 6.20 Influence of materials parameters on threshold voltage. (a) the threshold voltage equation indicating signs of the four contributions. (b) variation of V T with substrate doping for n- channel and p-channel n + poly-SiO 2 -Si devices.

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V T år 1990 vs 2009 2009 n + poly-SiO 2 -Si devices Al-SiO 2 -Si devices 1990

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C-V for n-kanale MOS-kapasitanse (~100 Hz) (~10 6 Hz) Figure 6.16: Capacitance-voltage relation for a n-channel (p-substrate) MOS capacitor. The dashed curve for V > V T occurs for high measurement frequencies.

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y(x)

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Påvirken av elektriskt felt ( E x og E y ) på kanalmobilitet

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y(x)

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Sammenlikning av likning 6:49 og 6:50

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’Typical feature size’ vs tid for Si-DRAM (Moore’s lov) Figure 9.3

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