EE 2212

PROBLEM SET 4

S. G. Burns

Due: Monday, 25 October 2021

NOTE 1: QUIZ 4 might also include a few basics related to photovoltaics and LED lighting. Your QUIZ 4 grades will be much better if you study the Photonics Supplement.

1. Text Problem 4.1 and 4.2 as a combination (Look at Figure 4.2 for guidance For Text 4.2, observe that is Cox, capacitance/unit area. Watch your units. Usually farads/cm² are preferred for Cox units. When the text and in industry talks about an MOS capacitor, they are usually referring to Cox. The total capacitance is then obtained by multiplying by (W x L). This idea of scaling is very important in VLSI circuit design. The parallel plate basic capacitor model works very well in VLSI design. We will soon discuss how this plays into imaging and display applications.

2. Text Problems 4.4 and 4.8 for NMOS and Text Problem 4.47 for PMOS Some additional basic calculations to provide experience in units and nomenclature. Organize your results in a table. Page 160 (NMOS) and 161 (PMOS) has a table defining the relationships for key FET model parameters.

3. From an old quiz. Regions of operation are very important in circuit design using MOSFETS. Extracted from an old quiz. For the indicated bias conditions, state whether the FET is operating in the OHMIC (TRIODE) region, SATURATION region, or CUTOFF region. Explain your reasoning. Assume that |V_T | = 2 volts for both the NMOS and PMOS enhancement mode transistors. M1 __________ M2 __________ M3 __________

M4 __________ M5 __________ M6 __________

4. Figure P4.18 NMOS Characteristics Generate a SPICE NMOS model by modifying the default NMOS transistor model (MBREAKN in PSPICE ) or the equivalent in LT SPICE that will reasonably match the curves in P4.18 figure. If you look at the curves, it is a good assumption that λ = 0. Your problem submission must include the listing of your modified MOS parameters and the resultant I_D-V_DS curves and the SQRT(ID) versus V_GS curve.

This is what we use for blocking dc and passing ac in many discrete device amplifier circuits. Synonymous with coupling capacitor. Also a dc blocking capacitor is employed in your oscilloscope when switching to AC input using the soft keys.

Consider the signal swing around the Q-Point which established the dynamic range of a circuit which we will use in amplifier design

Even though most of you are EE students, there is some information you can use from CS I. Of course, you can always dive deeper into CS but it messy in more ways than one, refer to the figure. I don’t know if this diagram is covered in more advanced CS courses if you decide to work on a CS or CprE Minor. Can you tell that I am a hardware guy!