lecture16 - Lecture #16 ANNOUNCEMENTS Midterm #1 Results:...

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Lecture 16, Slide 1 EECS40, Fall 2003 Prof. King Lecture #16 ANNOUNCEMENTS • Midterm #1 Results: – N=191; ave=44.3; σ =7.2; max=50; min=10 • HW#5 will be posted online today OUTLINE – Propagation delay – Energy consumption of simple RC circuit – RC circuit transient response examples Reading for next Lecture Textbook by J. Rabaey (online): Chapter 3 Lecture 16, Slide 2 EECS40, Fall 2003 Prof. King Voltage Ranges for Digital Signals • A digital signal varies with time, typically between between ground (0 Volts) and the power supply voltage ( V supply ). • A digital voltage signal has two defined states “high” (corresponding to logical state 1 ) or “low” (corresponding to logical state 0 ) • Each of the two states corresponds to a range of voltages, for example: logical 1 state: voltage > V supply /2 logical 0 state: voltage < V supply /2
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Lecture 16, Slide 3 EECS40, Fall 2003 Prof. King Example : Output voltage changing from “low” to “high” time V out 0 V supply 0.5 V supply Propagation Delay t p • The propagation delay t p of a logic gate defines how quickly the output voltage responds to a change in input voltage. It is measured between the 50% transition points of the input and output voltage waveforms. ( ) C
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lecture16 - Lecture #16 ANNOUNCEMENTS Midterm #1 Results:...

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