07ECE108MOSinverterdynamicresponse.pdf (1)

07ECE108MOSinverterdynamicresponse.pdf (1) - 7. MOSFET...

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7. MOSFET INVERTER DYNAMIC RESPONSE ECE 108 1 Esener ECE108
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7.1. INVERTER CAPACITANCES Esener ECE108 2 V ss =V s =0 V G Field Oxide V DD Poly Load Output C i C GB n C GS p C DS n C DS = C od C i C ol FC in ( 29 C L Cross-section of a resistive load MOS Inverter List of Parasistic MOS Inverter Capacitances 1 . Drain Junction Capacitance of driver 2 . Interconnect Capacitance 3. Capacitance Associated with load 4 . Load Inverter Capacitance where F=Fan Out The inverter must therefore drive a capacitance C L = C od + C ol + C i + FC in
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7.1.2. INPUT CAPACITANCE Esener ECE108 3 V ss =V s =0 V G Field Oxide V DD Poly Load Output C i C GB n C GS p C DS n C in 2245 C GS + C GB + C GD 2245 WL e ox t ox C in C L V DD The input capacitance C of the MOS inverter is the gate capacitance of the driver Capacitance at the output of a Resistive load MOS inverter C L = C od + C ol + C i + FC in
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7.2. RISE AND FALL TIMES Esener ECE108 4 V OL to V OH V OH to V OL Rise (t off or t r ) Rise time (Turn-off Time ) is approximately the time that the output voltage of the inverter takes to increase from Fall Time (t on or t f ) The Fall time (Turn-on -time ) is approximately the time that the output voltage takes to
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07ECE108MOSinverterdynamicresponse.pdf (1) - 7. MOSFET...

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