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EEE112 Integrated Electronics and Design

NMOS IC Design Project (Version 2025)

Assessment Weighting

This assessment counts for 20% of the module.

Aims

This project aims to provide students with an experience of designing a simple integrated circuit at the silicon layout level, as well as offering an insight into the manufacturing process flow.

Learning Outcomes

On completion of this project you should be able to:

1.    Understand the manufacturing processes involved in fabricating silicon-based devices.

2.    Understand the design process and constraints involved in developing IC.

3.    Produce layout and mask designs to scale of an NMOSFET logic circuit.

4.    Produce an engineering style report.

Design Task

The objective of this assignment is to design the simple logic circuit shown in Figure 1.

Fig. 1 Simple Logic Circuit

Task 1: What is the logic function of simple logic circuit in Fig. 1?

Task 2: What is the aspect ratio (W/L) for all the NMOSFETs in the circuit (total 4 NMOSFETs)? Please note that the VOUT  is assumed to be 0.2V, 0.1V and 0.01V respectively. Please calculate the aspect ratio (W/L) for all the NMOSFETs under different VOUT  (0.2V, 0.1V and 0.01V).

The process parameters for the design are listed in Table 1.

Table 1: Process Parameters

Task 3: 4-mask process is applied for the manufacturing of the NMOSFET. It is required to provide the process flow from step one till the last step. Each step shall have its top view and cross-section view. Please take NMOSFET C as an example (W/L ratio upon VOUT=0.2V).

Task 4 (Extra): If we use the TSMC 3nm technology, 2λ (feature size) is 3nm. You are encouraged to produce a full circuit design layout (full layout) to scale together with the necessary masks to form. each layer (from mask 1 to mask 4), by considering the MOSIS  design rules (see the last page), and your knowledge from the lectures. (W/L ratio upon VOUT=0.2 V)

You are highly appreciated minimize the full layout as compact and small as possible, following the MOSIS design rules.

Assignment Output and Grading Information

It is required to write a short formal report (no more than 50 pages in total). The report will be graded against the requirements are set out below:

1.   Report format:  cover page, contents, abstract, introduction, main body, conclusion, references.             10%

2.   Main body 1 (Task 1): What is the logic function of simple logic circuit in Fig. 1?                                      20%

Detailed analysis should be given together with truth table of the simple logic circuit.

3.   Main body 2 (Task 2): What is the aspect ratio (W/L) for all the NMOSFETs in the circuit (total 4 NMOSFETs)? Please note that the VOUT  is assumed to be 0.2V, 0.1V and 0.01V  respectively. Please calculate the aspect ratio (W/L) for all the NMOSFETs under different VOUT  (0.2V, 0.1V and 0.01V).                 30%

The process parameters for the design are listed in Table 1.

Table 1: Process Parameters

Please provide the detailed analysis for the calculation. It is also important to identify which mode (linear or saturation)for all the NMOSFETs in the circuit (total 4 NMOSFETs).

4.   Main body 3 (Task 3): 4-mask process is applied for the manufacturing of the  NMOSFET. It is required to provide the process flow from step one till the last step. Each step shall have its top view and cross-section view. Please take NMOSFET C as an example (W/L ratio upon VOUT=0.2 V).                    40%

Clearer and detailed discussion for all the steps are required in this section, together its top view and cross-section view.

5.   Main body 4 (Extra): If we use the TSMC 3nm technology, 2λ (feature size) is 3nm. You are encouraged to produce a full circuit design layout (full layout) to    scale together with the necessary masks to form. each layer (from mask 1 to mask 4), by considering the MOSIS design rules (see the last page), and your knowledge from the lectures (W/L ratio upon VOUT=0.2 V).            Extra 10%

You are highly appreciated minimize the full layout as compact and small as possible,following the MOSIS design rules.

You are suggested to use handwrite or software for the full layout and four masks. Full layout means the final layout merging four masks together. For handwrite, either photo or scan into the report is acceptable. For software,figure capture is acceptable.

Please identify the related MOSIS design rules in your design. (unit: nm)

Mask information is listed as follow:

1.          Mask 1: Active layer

2.          Mask 2: Poly-Si layer

3.          Mask 3: Contact layer

4.          Mask 4: Metal layer

5.          Full layout: Overlay of all the masks (merging four masks together)