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VLSI Interview Questions
Questions Answers Views Company eMail

Explain CMOS Inverter transfer characteristics?

ADS,

3963

Explain sizing of the inverter?

Infosys,

4485

How do you size NMOS and PMOS transistors to increase the threshold voltage?

4 29721

What is Noise Margin? Explain the procedure to determine Noise Margin?

2509

Give the expression for CMOS switching power dissipation?

Cypress Semiconductor,

2 8403

What is Body Effect?

CG CoreEL, Cisco, TA,

2567

What happens to delay if you increase load capacitance?

Google,

1 3727

What are the limitations in increasing the power supply to reduce delay?

Infosys,

2 13603

How does Resistance of the metal lines vary with increasing thickness and increasing length?

Infosys,

3 13722

What happens if we increase the number of contacts or via from one metal layer to the next?

Infosys,

1 7641

Give the various techniques you know to minimize power consumption?

5 13253

Explain the Charge Sharing problem while sampling data from a Bus?

1 5017

What happens if we use an Inverter instead of the Differential Sense Amplifier?

3057

What is the critical path in a SRAM?

3257

In a SRAM layout, which metal layers would you prefer for Word Lines and Bit Lines? Why?

Infosys,

4171


Post New VLSI Questions

Un-Answered Questions { VLSI }

Differences between IRSIM and SPICE?

5480


What happens if we use an Inverter instead of the Differential Sense Amplifier?

3057


What's the price in 1K quantity?

2882


Cross section of a PMOS transistor?

4816


Implement a function with both ratioes and domino logic and merits and demerits of each logic?

1237


Need to convert this VHDL code into VLSI verilog code? LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; ----using all functions of specific package--- ENTITY tollbooth2 IS PORT (Clock,car_s,RE : IN STD_LOGIC; coin_s : IN STD_LOGIC_VECTOR(1 DOWNTO 0); r_light,g_light,alarm : OUT STD_LOGIC); END tollbooth2; ARCHITECTURE Behav OF tollbooth2 IS TYPE state_type IS (NO_CAR,GOTZERO,GOTFIV,GOTTEN,GOTFIF,GOTTWEN,CAR_PAID,CHEATE D); ------GOTZERO = PAID $0.00--------- ------GOTFIV = PAID $0.05---------- ------GOTTEN = PAID $0.10---------- ------GOTFIF = PAID $0.15---------- ------GOTTWEN = PAID $0.20--------- SIGNAL present_state,next_state : state_type; BEGIN -----Next state is identified using present state,car & coin sensors------ PROCESS(present_state,car_s,coin_s) BEGIN CASE present_state IS WHEN NO_CAR => IF (car_s = '1') THEN next_state <= GOTZERO; ELSE next_state <= NO_CAR; END IF; WHEN GOTZERO => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTZERO; ELSIF (coin_s = "01") THEN next_state <= GOTFIV; ELSIF (coin_s ="10") THEN next_state <= GOTTEN; END IF; WHEN GOTFIV=> IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTFIV; ELSIF (coin_s = "01") THEN next_state <= GOTTEN; ELSIF (coin_s <= "10") THEN next_state <= GOTFIV; END IF; WHEN GOTTEN => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s ="00") THEN next_state <= GOTTEN; ELSIF (coin_s="01") THEN next_state <= GOTFIV; ELSIF (coin_s="10") THEN next_state <= GOTTWEN; END IF; WHEN GOTFIF => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTFIF; ELSIF (coin_s ="01") THEN next_state <= GOTTWEN; ELSIF (coin_s = "10") THEN next_state <= GOTTWEN; END IF; WHEN GOTTWEN => next_state <= CAR_PAID; WHEN CAR_PAID => IF (car_s = '0') THEN next_state <= NO_CAR; ELSE next_state<= CAR_PAID; END IF; WHEN CHEATED => IF (car_s = '1') THEN next_state <= GOTZERO; ELSE next_state <= CHEATED; END IF; END CASE; END PROCESS;-----End of Process 1 -------PROCESS 2 for STATE REGISTER CLOCKING-------- PROCESS(Clock,RE) BEGIN IF RE = '1' THEN present_state <= GOTZERO; ----When the clock changes from low to high,the state of the system ----stored in next_state becomes the present state----- ELSIF Clock'EVENT AND Clock ='1' THEN present_state <= next_state; END IF; END PROCESS;-----End of Process 2------- --------------------------------------------------------- -----Conditional signal assignment statements---------- r_light <= '0' WHEN present_state = CAR_PAID ELSE '1'; g_light <= '1' WHEN present_state = CAR_PAID ELSE '0'; alarm <= '1' WHEN present_state = CHEATED ELSE '0'; END Behav;

5326


Draw Vds-Ids curve for a MOSFET. Now, show how this curve changes with increasing Vgs.

1172


What is the function of chain reordering?

1120


What is the critical path in a SRAM?

3257


If an/ap = 0.5, an/ap = 1, an/ap = 3, for 3 inverters draw the transfer characteristics?

2553


What are the steps involved in preventing the metastability?

1168


For f = AB+CD if B is S-a-1, what are the test vectors needed to detect the fault?

1296


What is Latch Up? Explain Latch Up with cross section of a CMOS Inverter. How do you avoid Latch Up?

1420


what is verilog?

1196


Give the logic expression for an AOI gate. Draw its transistor level equivalent. Draw its stick diagram

1535