CMOS Logic Circuit Design by John P. Uyemura (auth.)

By John P. Uyemura (auth.)

CMOS common sense Circuit Design is an updated therapy of the research and layout of CMOS built-in electronic common sense circuits. it's a self- contained remedy that covers the entire very important electronic circuit layout kinds present in smooth CMOS chips.
Introductory chapters on MOSFET physics and CMOS fabrication give you the historical past wanted for an outstanding realizing of the circuit layout thoughts within the rest of the booklet. Static CMOS common sense layout is given an in-depth remedy which covers either the research and layout of those kinds of circuits. Emphasis is on reading circuits to appreciate the connection among the layout and function in an built-in surroundings. Analytic types and their program are offered to supply a uniform base for the layout philosophy built within the research.
Dynamic circuit options equivalent to cost sharing and cost leakage are provided intimately after which utilized to dynamic good judgment households corresponding to domino cascades, self-resetting common sense, and dynamic single-phase designs. Differential good judgment households are given a complete bankruptcy that discusses CVSL, CPL, and comparable layout types. Chip concerns equivalent to interconnect modeling, crosstalk, and input/output circuits around out the insurance.
CMOS common sense Circuit Design offers the reader with a chance to determine the sector in a unified demeanour that emphasizes fixing layout difficulties utilizing a few of the good judgment types on hand in CMOS.
CMOS common sense Circuit Design is designed for use as either a textbook (either within the school room or for self-study) and as a reference for the VLSI chip designer.

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This simple model has the virtue of being easy to apply in practice. In digital CMOS circuits, we will estimate the total capacitance at every node by simply adding all contributions that are required to change voltage during a switching event. This automatically introduces errors into the calculations. However, the approach is easy to use and generally provides numerical results that are reasonable estimates of the actual circuit performance. Since we expect that every circuit will eventually be simulated on a computer anyway, this type of analytic modelling is adequate for a first MOSFET Modelling 35 estimate on the performance during the design phases.

Tradeoffs of this type will be discussed in great detail in the remaining chapters of the book. 4 MOSFET Modelling An accurate electronic characterization of any devices requires both the I-V relationship and a model for all of the important parasitic elements that exist due to the physical structure and operation. This is particularly important for CMOS VLSI, since the parasitic components are often the limiting factor in the circuit performance. 22. This consists of a linear resistor drain and source capacitors and respectively, a voltage-controlled switch that uses the gate electrode as the control terminal, and reverse-bias diodes.

3 Let us look at the effects of a simple scaling with S=2. 41). The reduction in surface area is obvious. However, note that full voltage scaling also reduces the power of the scaled device to onefourth that of the original layout. One more important point must be mentioned in the context of full-voltage scaling. The requirement that the charge density be increased means that the doping densities are scaled according to to preserve the form. Unfortunately, increasing the doping densities at a pn junction increases the junction capacitance, and reduces the reverse breakdown voltage.

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