SUBJECT NAME: VLSI DESIGN. SUBJECT CODE: EC UNIT I CMOS TECHNOLOGY. PART –A (2 MARKS). 1. What are four generations of Integration. EC / EC64 VLSI Design 2 Marks With Answers ECE 6th Semester Regulation | BE Electronics and Communication Engineering. Sixth Semester. 2 MARK QUESTION AND ANSWERS. ECVLSI DESIGN is CMOS technology? Complementary Metal Oxide Semiconductor (CMOS)in which.

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Mention the ideas to increase the speed of fault simulation? When area is of primeme concern, it i is possible to reduce the cost of the he multiplier by using a time multiplexed approach ach. Mention the levels at which testing of a chip can be done? The effective length of the conductive channel is actually modulated by the applied VDS, increasing VDS causes the depletion region at the drain junction to grow, reducing the length of the effective channel.

The standard cell areas also called flexible blocks in a CHIC are built of rows of standard cells. Routing is done using the spaces Routing is done using the area of transist unused.

What is Stick Diagram? What are the features of standard celled ASICs? Write down the expression for worst case delay for RCA. Remember me on this computer.

EC VLSI Design Two Marks with Answers – Edition

What are the scan-based test techniques? Power is the rate at which energy is delivered or exchanged; power dissipation is the rate at which energy is taken from the source VDD and converted into heat electrical energy is converted into heat energy during operation.

Also it is the cartoon of a chip e2c354.


Only the top few mask layer customized customized. The standard cell areas also called fle4xible blocks in a CBIC are built of rows of standard cells. What is a Manjestor carry chain adder?

If the gate field must induce a channel before current can flow and the gate voltage enhances the channel current and such a device is said to the enhancement mode MOS. The carry skip adder is shown to be superior to constant width carry skip module the advantages being greater at high precisions.

An approach to fault analysis is known as fault sampling. Sense amplifier is needed for reading. Give the major advantages of IC. By using sleep transistors to isolate the supply from the block to achieve significant leakage power savings. What are the various ways to reduce the delay time of a CMOS inverter?

EC – VLSI Design 2Marks with Answer and 16Marks Question

None of the mask layers are customized A method of programming the basic logic cells and the interconnect. What are the various Silicon wafer Preparation? Zero gate voltage drain current Idss 6. What are the advantages of ripple carry adder? The increasing complexity of boards and the movement to technologies like multichip modules and surface-mount technologies resulted in system designers agreeing on a unified scan-based methodology for testing chips at the board.

A field programmable gate array FPGA is a programmable logic device that supports implementation of relatively large logic circuits. What are the different levels of design abstraction at physical design.

What is meant by observability? Event-based timing control 3. But at the same time, latch based design is more complicated and has more issues in min timing races. The synchronizers ensure synchronization between asynchronous input and synchronous system.

What is the standard vlsj based ASIC design? These tests are used after the chip is manufactured to verify that the silicon is intact. What is boundary scan? Latch based design and flop based design is that latch allows time borrowing which a tradition flip flop does not: Dynamic circuits rely on the temporary storage of signal values on the capacitance of high impedance node.


This Voltage effectively pinches off the channel near the drain. Other adder structures use logic optimizations to increase the performance carry bypass, carry select, carry look ahead. The test architecture consists of: The number of distinct addresses possible with n input variables is 2n.


Using proper synchronizers two stage or three stageas soon as the data is coming from the asynchronous domain. The width of the MOS transistor can be increased to reduce delay this is known as gate sizing, which will be discussed answfrs in more details.

What is metastability and list the steps to prevent it? State different types of oxidation. What is enhancement mode operation of MOS? These include serial-shift clocks and update clocks.

It takes a sequence of precharge and conditional evaluation phases to realize 22 logic functions. List the advantages of pass transistor logic.

The boundary scan register is a special case of a data register. Why is carry bypass Adder called so? What are the contents of the test witu

An always block vesign in a loop and repeats during the simulation. What is a FPGA? Careful control during fabrication is necessary to avoid this problem.