Answer Posted / bhau

In digital logic design the general representation of input
and output are High and low level (1's and 0's). In actual
case when the input signal transitions the output switches
to full swing before the input has reached its full swing.
The minimum signal level to get a out put High or low is
called VIH, VIL (For inversion stage Input for getting full
output low swing and input for getting full output high
swing). For the interoperability of this logic device i.e.
to use tihs output directly to feed into next stage without
level shifting the VIL > VOL, similarly VIH < VOH. In such
condition when logic swing VIL is enough to get full swing
on Output the noise margin will be VOL-VIL. Similarly NM
for signal transitioning high is VOH-VIH.

what is multiplexer?

1164

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Explain Cross section of an NMOS transistor?

1028

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Mention what are three regions of operation of mosfet and how are they used?

1082

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Explain the Working of a 2-stage OPAMP?

1198

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Tell me how MOSFET works.

2428

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Explain why present VLSI circuits use MOSFETs instead of BJTs?

1151

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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;

5273

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what is SCR (Silicon Controlled Rectifier)?

1042

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Explain the working of 4-bit Up/down Counter?

4437

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What are the main issues associated with multiprocessor caches and how might you solve them?

2227

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what are three regions of operation of MOSFET and how are they used?

1242

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How to improve these parameters? (Cascode topology, use long channel transistors)

2187

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Give the cross-sectional diagram of the cmos.

1000

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Explain why is the number of gate inputs to cmos gates usually limited to four?

1501

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

1303

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