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454Lec07_VTC1 - ECEN 454 Digital Integrated Circuit Design...

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ECEN 454 Lecture 7 1 ECEN 454 Digital Integrated Circuit Design Lecture 7 MOS Inverter Characteristics I
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ECEN 454 Lecture 7 2 Ideal Inverter
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ECEN 454 Lecture 7 3 Ideal VTC Voltage Transfer Characteristic (VTC)
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ECEN 454 Lecture 7 4 Realistic VTC •V OH : maximum output voltage when the output level is logic “1” •V OL : minimum output voltage when the output level is logic “0” •V IL : maximum input voltage which can be interpreted as logic “0” •V IH : minimum input voltage which can be interpreted as logic “1” •V th : threshold voltage (transition voltage) V in = V out
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ECEN 454 Lecture 7 5 Noise Margins (1) Influence of noise
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ECEN 454 Lecture 7 6 Noise Margins (2) Noise tolerance is defined in terms noise margin (NM) Low signal level --- NM L = V IL – V OL High signal level --- NM H = V OH – V IH
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ECEN 454 Lecture 7 7 Generic nMOS Inverter
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ECEN 454 Lecture 7 8 Resistive-Load Inverter
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ECEN 454 Lecture 7 9 Resistive-Load Inverter VTC (1) Adopted from the lecture materials of CMU 18-322, Analysis and Design of Digital ICs
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