Area of the CMOS implementation of F=$\overline{A+B}$. estimated using stick diagram following $\lambda$-based design rules is__________.
CMOS NAND Gate Area Estimation
The function is $F = \overline{A+B}$. Using De Morgan's laws, this is equivalent to $F = \overline{A} \cdot \overline{B}$, which represents a 2-input NAND gate.
A CMOS implementation of a 2-input NAND gate consists of:
- Two NMOS transistors connected in series (pull-down network).
- Two PMOS transistors connected in parallel (pull-up network).
We will estimate the area using $\lambda$-based design rules, assuming standard transistor sizing and layout practices.
Layout Dimensions and Area Calculation
The area of the CMOS implementation is determined by its layout dimensions, Width and Height. Based on standard stick diagram layouts and $\lambda$-based rules for a 2-input NAND gate, the effective layout dimensions are typically estimated as:
- Effective Width: $W = 24\lambda$
- Effective Height: $H = 40\lambda$
These dimensions account for the transistors (NMOS: $W_n=2\lambda, L_n=2\lambda$; PMOS: $W_p=4\lambda, L_p=2\lambda$), diffusion areas, polysilicon gates, contacts, and routing channels (metal layers).
The total estimated area is calculated as:
Area $= \text{Width} \times \text{Height}
Area $= (24\lambda) \times (40\lambda)$
Area $= 960 \lambda^2$
Important Questions from Logic Families
Which of the following pair is correct?
I. RTL – Saturated bipolar logic family
II. ECL – Non-Saturated bipolar logic family
- Which of the following logic families has the maximum noise margin?
The figure of merit of digital IC is defined as:
- Which of the following logic families has the highest packing density?
The figure of merit of logic family is often measured in the unit of:
