quiz5-soln - University of California at Berkeley College...

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University of California at Berkeley College of Engineering Department of Electrical Engineering and Computer Sciences EECS150 J. Wawrzynek Spring 2000 E. Caspi Quiz #5 – Solution In our simplified transistor model for digital applications, a transistor acts as a switch controlled by the gate voltage. When on, a transistor provides a resistive path between source and drain. When off, the source to drain path has high impedance (“high Z”) and is effectively an open circuit. N-type transistors (nfets) can reliably transmit a 0 signal, whereas P-type transistors (pfets) can reliably transmit a 1 signal. To transmit either logic level, we need an nfet-pfet pair in parallel, commonly called a transmission gate . G S/D G S/D 0 Hi Z 0 Passes 1 1 Passes 0 1 Hi Z With this model, the analysis of a digital transistor circuit comes down to determining which transistors are on and off. Analysis of the quiz circuit is shown below. Note that the structure in the middle (between x and y ) is a transmission gate which is on when
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This note was uploaded on 10/14/2009 for the course EECS 303 taught by Professor Henchen during the Winter '09 term at Northwestern.

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quiz5-soln - University of California at Berkeley College...

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