SAMPLE QUESTIONS IN VLSI CUSTOM LAYOUT DESIGN

SAMPLE QUESTIONS – CUSTOM LAYOUT DESIGN 

  1. For the circuit shown below plot the trans-conductance as a functions of VDS. 1M

  2. Using only inverters, design simplest memory element. How many stable and Meta stable points does it have? Explain the conditions that lead to Meta stability . 2M
  3. Why latch-up occurs? How can you avoid the problem of latch-up? 2M
  4. Keeping all the other parameters constant plot ID Vs VDS characteristic of a MOSFET for length L = L1 and L = 2L1. 2M
  5. Sketch the drain current (ID) and transconductance (gm) of the transistor M as a function of input voltage. 2M

6. Assuming the value of the resistor as R, What are the effective resistance from source to drain of the following two transistors? 2M

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7. Vin = Sin Ɯt. Find Vout  what happens if the input terminals are interchanged?

q7

  1. Design a combination of inductors, resistors and capacitors that has an equivalent impedance of 1 + 4 jΩ at w = 1 rad/sec. 2M
  2. In a series RC circuit RMS voltage measured across the resistor is 12V and the RMS voltage measured across capacitor is 15V. The RMS voltage of the source is _______ 2M
  3. A 6KHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is ________. 2M

4. Figure out the Vout wave form of the following circuits assuming R=1 Kohm and C=1 micro-farad and input is square wave of Frequency 200Hz.  4M

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  1. 90 people applied for a job as a salesperson for a book publishing company. 10 of the applicants had never worked in sales or in publishing business. 65 had worked in sales at some point and 58 had some background in publishing.How many of the applicants had experience in both sales and publishing ?
  2. If one worker can complete a job in 6 days and a second worker can complete the same job in 12 days, how long will it take if both work together ?
  3. Ram and Shyam went to purchase a book from a bookshop. Unfortunately,neither of them had enough money, though both had some money . Ram realized he was Rs 2 short of the price of the book, while Shyam was Rs 24 short of the price. When they put their money together , even then they did not have enough money to buy the book. What was the price of the book ?
  4. A train passes a station in 36 s and a man standing on the platform in 20 s. If the speed of the train is 15 meters/sec the length of the platform is ———-.
  5. If x is 80% of y, then what percent of 2x is y ?