Cmos Logic Circuit Design by John P. Uyemura

By John P. Uyemura

CMOS good judgment Circuit layout is an updated remedy of the research and layout of CMOS built-in electronic common sense circuits. it's a self- contained therapy that covers the entire very important electronic circuit layout types present in sleek CMOS chips. Introductory chapters on MOSFET physics and CMOS fabrication give you the historical past wanted for an effective figuring out of the circuit layout concepts within the rest of the ebook. Static CMOS good judgment layout is given an in-depth remedy which covers either the research and layout of those sorts of circuits. Emphasis is on examining circuits to appreciate the connection among the layout and function in an built-in setting. Analytic versions and their program are provided to supply a uniform base for the layout philosophy constructed within the examine. Dynamic circuit recommendations reminiscent of cost sharing and cost leakage are awarded intimately after which utilized to dynamic common sense households similar to domino cascades, self-resetting good judgment, and dynamic single-phase designs. Differential good judgment households are given a complete bankruptcy that discusses CVSL, CPL, and similar layout types. Chip concerns corresponding to interconnect modeling, crosstalk, and input/output circuits around out the insurance. CMOS good judgment Circuit layout presents the reader with a chance to work out the sphere in a unified demeanour that emphasizes fixing layout difficulties utilizing many of the common sense kinds on hand in CMOS. CMOS common sense Circuit layout 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 fashion designer.

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MOSFET Modelling 31 where P is the total perimeter length around the region in units of centimeters. The value of P is obtained from the layout geometry for each transistor; in the present case, This approach is also more useful in practice, since the perimeter length P can be determined directly from the layout. The total zero-biased depletion capacitance of the region is then given by It is important to note that the depletion capacitance increases with the channel width W. 33 where the source and drain regions have different dimensions.

That the charge motion is induced solely by the electric field. Diffusion effects due to concentration gradients of the form (dn/dy) are neglected in the analysis. This approach was named the gradual channel approximation by Shockley since it assumes that the gradients are small. While it remains a useful vehicle for understanding conduction through a field-effect transistor, the equations derived below are only valid in devices with long channel lengths. This point is examined in more detail in 14 the latter sections of this chapter.

32 shows how the 3-dimensional structure is split into the two types of contributions; the total capacitance is then obtained by adding. Consider first the bottom capacitance. The zerobias capacitance per unit area is given by Since the area of the bottom is A=WX, the zero-biased value of the bottom contribution is The sidewall capacitance is calculated in a different manner. We will denote the zero-bias sidewall capacitance per unit area by However, since each of the sidewalls regions has a depth we will define as the sidewall capacitance per unit perimeter in units of F/cm.

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