EE 2212

PROBLEM SET 5

S. G. Burns

Due: Wednesday, 28 October 2020

NOTE 1: I strongly encourage studying the photonic concepts and devices from the (Photonics PowerPoint). Problems associated with Text Section 3.18 are quite limited but the optoelectronics area is of rapidly growing importance. You can expect Quiz 5 to cover topics in the Text Section 3.18 and the Photonics PPT slides PhotonicsSupplementTextSection3.18.ppt

NOTE 2: Table 4.6 on Page 203 provides useful generic FET specifications information. If these data are not provided in any of the Chapter 4 text problems, use information in Table 4.6. Also the

inside of the front cover has all sorts of useful data. Just below Table 4.6 on Page 203, you will

also find some key constants; also on the inside of the front cover.

NOTE 3: I also want to call your attention to the following link from our WEB page

FETNMOSSummary.jpeg and FETPMOSSummary.jpeg

NOTE 4: Be sure your WEB browser displays symbol font correctly.

NOTE 5: Problems 5 and 6 relate to introductory FET topics. They are plug-and chug.

Problem 1 Tuned Circuit Design Using A VARICAP

(a) Refer to the capacitance curves for the Motorola 1N4002 1N400XCap.JPG . The input tuning circuit of a standard analog FM radio is given below. Specify, that is design for, a voltage, capacitance required to tune the circuit to the center frequency of KUMD-FM which operates at 103.3 MHz. (By the way-Did you know that KUMD is probably going to be sold to WDSE-Local PBS Station). Under Minnesota Board of Regents consideration. Sketching and labeling a representative resonance curve is required to support your calculations.

(b) Repeat if you use the Motorola MMBV109LT1 MV209. Refer to the EE 2212 WEB pages Hyperdiode1.JPG and HyperDiode2.JPG.

Problem 2 (Excerpted from an old quiz) Assume V_J = 0.7 volts.

(a) Using the derating curve from the 1N4001 shown below, compute the total thermal resistance, q.

(b) Recommend a maximum operating current and power if this power diode were located under the hood of your car where the temperature approaches 212°F = 100°C.

Problem 3 Text 3.121 and 3.122 as a combination. A bit of a plug-and-chug. You will find PeriodicTableTextChapter2.jpeg useful for the E_G values. This is a useful review of Problem 4 on

Problem Set 3.

Provide your answers in a table, of a form shown below, to summarize your calculations.

Material

Eg

Wavelength λ in μm

Relation to Visible Spectrum

Problem 4 Solar Panel Analysis (Adapted from an old quiz). Refer to topics covered in the

PhotonicsSupplementTextSection3.18.ppt . This commercial solar panel has an area of 1.6 m². The I-V curves are shown below. Estimate/compute values for the quantities indicated. Illustrate your answers on the vendor I-V curves.

(a) _____________Reasonable accepted value for the solar constant above the Earth’s atmosphere.

(b) _____________Reasonable accepted value for the solar constant at the surface of the Earth.

(c) At the Earth’s surface, the solar spectrum peaks in the (IR, Red, Green-Yellow, Blue, UV).

(d) ______ Open Circuit Voltage, V_OC.

(e) ______Short Circuit Current, I_SC

(f) _______Estimate of maximum Power Output corresponding to your answer in Part (b) above and illustrate, on the graph, how you obtained this value.

(g) ________________ Panel Conversion Efficiency, %, using your results from Part (f) above.

Panel Area = 1.6 m²

Problem 5 Text Problem 4.1 (Look at Figure 4.2 for guidance) and Text Problem 4.2 as a combination. For Text 4.2 observe that this is Cox, capacitance per unit area. Watch your units. Usually farads/cm² are preferred for the capacitance per unit area units. When the text and in the industry talks about an MOS capacitor, they are usually referring to capacitance/unit area. The total capacitance can then be scaled by multiplying by (W x L). Refer to Monday, 24 February class notes. This idea of scaling is a very important VLSI design concept. The parallel plate basic capacitor model works well! We will also soon observe how this plays into imaging and display applications.

Problem 6 Text 4.4 and 4.8 for NMOS and Text 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. Refer to the WEB links in Note 2.

All of these cartoons are relevant my pre-COVID life at UMD.

(1) I have my own K-Cup coffee pot to avoid issues.

(2) I have a slide rule collection and even know how to use them. Amaze your parents and grandparents-Stop in to my office when face-to-face resiumes post-COVID if you want a short course on how to use a slide rule. Free lessons! In their day, prior to the early 70s, slide rules were a great tool to learn about log₁₀ theory and applications. I have a few displayed in my office. My HP 35 scientific calculator I purchased as a poor graduate student was $400. Lots of Ramen noodles for a couple of months but I had to have it!

(3) The iPAD and Macbook are so friendly and the graphics are great, but I can’t find a good SPICE APP.

(4) For those of you who are aware of the current UMD budget issues, the Dilbert cartoon says it all. ENJOY!

Recall the WOM (Write-Only-Memory) Signetics Data Sheet from the attachment to the diode circuits experiment. Fun-loving (sort of depends on you define fun) Signetics engineers may have taken a clue from some engineers at EIMAC or the other way around. EIMAC manufactures high power and specialty vacuum tubes used in high power transmitters and RF generators and related. This is a data sheet for the “PHANTASATRON”. EIMAC is now a subsidiary of Communications and Power Industries. Even though small vacuum tubes are no longer made in the U.S., some manufacturers in Russia and Brazil cater to the high end audiophile market. We will talk about vacuum tube audio amplifiers towards the end of the semester. Larger, high power transmitting tubes and speciality vacuum tubes are manufactured by EIMAC and others. Enjoy!