21 - MOSFET Applications

21 - MOSFET Applications - EECS 320 MOSFET Applications...

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EECS 320 MOSFET Applications J. Phillips EECS 320 MOSFET Inverter 5 V V in V out R 5 V V in V out R NMOS V in =0 “Off” Vout = 5 V V in =5 V “On” Vout = V OL PMOS V in =0 “On” Vout = V OH V in =5 V “Off” Vout = 0 V MOSFET used as a “pull-down” (NMOS) or “pull up” (PMOS) device
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J. Phillips EECS 320 MOSFET Load Resistors take up valuable “real estate” MOSFET may be used as a resistor Example: Saturated Enhancement Load V = V DS I = I D V GS = V DS Saturation = V + - I I V + - () GS DS T GS ox DS T GS DS D DS V V V V WC LV V V k V I V R = = = = ; 2 2 2 2 µ J. Phillips EECS 320 MOSFET In The Digital World Size – high packing density Speed – fast switching (correlation with size) Power – low power consumption Noise margin – identifying 1’s and 0’s V in V out V OH V OL V IH V IL “1” “0” Concerns For Digital Integrated Circuits
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J. Phillips EECS 320 Complementary MOS Integrate NMOS and PMOS Current only flows during switching Low Power consumption 5 V V in V out Q2 Q1 V in =0 V Q1 Off Q2 On Vout = V OH V in =5 V Q1 On Q2 Off Vout = V OL V in V out Q1 On Q2 Off Q1 Off Q2 On Q1 On Q2 On
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21 - MOSFET Applications - EECS 320 MOSFET Applications...

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