What is Gate: Definition and 259 Discussions

A gate or gateway is a point of entry to or from a space enclosed by walls. The word derived from old Norse "gat" meaning road or path; But other terms includ yett and port. The concept originally referred to the gap or hole in the wall or fence, rather than a barrier which closed it. Gates may prevent or control the entry or exit of individuals, or they may be merely decorative. The moving part or parts of a gateway may be considered "doors", as they are fixed at one side whilst opening and closing like one.A gate may have a latch that can be raised and lowered to both open a gate or prevent it from swinging. Locks are also used on gates to increase the security. Larger gates can be used for a whole building, such as a castle or fortified town. Actual doors can also be considered gates when they are used to block entry as prevalent within a gatehouse. Today, many gate doors are opened by an automated gate operator.

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  1. mishima

    Logic gate Simulation Software?

    Hi, I have used Digital Works and Logisim for doing things like building memory cells out of logic gates and general study of sequential logic. The free version of Digital Works does not work on my 64 bit windows computer at work, and Logisim does not offer all of the features of Digital Works...
  2. A

    How Does a Light Gate Function in Physics Experiments?

    I'm looking for an explanation for my physics investigation thanks in advance ;D
  3. C

    What is trivial and non-trivial gate in computing?

    My question seems like it should be posted in Computer Engineering section, but below is how I found this word. I was reading the textbook: Quantum Computation And Quantum Information - by Michael A. Nielsen and Issac L. Chuang. and I came across with the this word; "1.3.1 Single qubit gates...
  4. A

    Designing an XOR Gate from NOR Gates: Truth Tables and Boolean Algebra

    Homework Statement Use truth tables for a NOR gate to design an XOR gate. I'm trying to understand how to design simple gates using boolean algebra and I'm getting nowhere. An example I'm working on is a XOR gate built from NOR gates, I already know how to wire it to a breadboard and it...
  5. ellipsis

    Minimizing systems of boolean functions as per specific gate costs

    I've been grappling with this problem for a long time, but I think someone on this forum may know about this. Minimizing the joint number of products of a system of boolean equations is well-studied, and has various software implementations. Those are the Quine-McCluskey and Espresso...
  6. I

    MHB Creating an inverter from a 2 input NAND gate

    how would yo connect a 2 input nand gate to form a basic inverter? i constructed a truth table. i know that the two middle ones don't count because the inputs have to be of the same value for an inverter. but what conclusion can i draw from this?
  7. N

    Can a Washing Machine Motor Be Used in a Sliding Gate Opener Project?

    Hello Guys, Can I use a washing machine's motor in a sliding gate opener project ?
  8. perplexabot

    Why Does My LTSpice NDG Transistor Mixer Output Not Exceed 0.3V?

    Hello all. So i have been trying to simulate a ndg transistor mixer in LTSpice. Here is what I have so far, but I am missing something and I can't figure what it is... Here is the schematic along with the waveforms. For some reason the output will not go over 0.3V (do I have to bias it?)...
  9. K

    Need help with a logic gate circuit please?

    Hello, I just joined because I am having a serious issue figuring out a logic gate circuit with 4 source signals, and a non active state and two items that activate depending on a number of different states for each signal. I've been giving myself a headache for hours trying to puzzle this out...
  10. P

    Gate source voltage and gate cathode voltage

    I am studying thyrisors right now. I am really struck at trigger circuit . The book shows gate source voltage and gate chathode voltage as two different things. I fail to understand the difference and significance of them. Please help me out .
  11. G

    TTL - Is there a logic gate or IC that does this?

    So this summer I plan on taking a long break from my arduino and learning some more 'ancient' and fun stuff. I plan on learning to use and make different circuits using TTL's. I have read a bit on it and learned on the basic logic gates like(using '/' as separator for the reverse) n/and,n/or...
  12. latsany

    How Governor HVG (High Value Gate) block function

    Hi, I am a student at University of Lao, Faculty of Engineering, Electrical Engineering Department I am researching about Speed Governor control system of a Hydro Power plant in my country and unfortunately, the company who owner of hydro power plant they have lost some of them papers of...
  13. A

    Understanding CMOS Gate States: Shoot-Through and Capacitance Effects

    Please help me with the question in the picture about pull-up and pull-down networks.
  14. G

    K-Map & Logic Gate Help: 4 Variables x3, x2, x1, x0

    Homework Statement There are four variable(x3,x2.x1,x0),how should I put them on a K-map? Is it like that? The Attempt at a Solution
  15. T

    Does Gate Oxide Breakdown Voltage Vary with Bias Polarity in NMOS Transistors?

    For a NMOS transistor, is there a difference in gate oxide breakdown voltage if we apply a positive bias on gate and a negative bias on gate? (assume S/D/bulk are ground)
  16. W

    Fluid Mechanics: Tilted Axes and Weight of Gate

    Homework Statement AB is homogeneous with mass of 180 kg, goes 1.2m in the page and is hinged at A and resting on aa smooth bottom at B. All fluids at 20 C. Find height of water that will result on 0 force at B Homework Equations M_s = \int\int_s \ (\vec{r} \times \hat{n} )PdA...
  17. jegues

    DC-DC Converter for Gate Driver Circuitry (Electric Motorcycle)

    Evening all, I'm trying to pick out a suitable DC-DC Converter for our low power gate driver circuitry and I'm unsure about a number of different things. First some background on the circuitry and what the DC-DC Converter is needed for. To date, we've designed, built and tested a low...
  18. PsychonautQQ

    Verify XOR Gate Incorrectness on Wikipedia - Expert Help Needed

    http://en.wikipedia.org/wiki/XOR_gate scroll down a little bit on this article and there is a picture labeled "xor gate made out of nands" Can somebody verify that this wikipedia article is incorrect for me? The truth table I came up with is the exact opposite of an xor. When a and b are both...
  19. D

    Calculate Gate Source, Drain Current, and Source Voltage of a JFET

    Homework Statement Uploaded Homework Equations Uploaded The Attempt at a Solution So what I started with is Vg=(R2/(R1+R2))Vdd - 10 = -7 Volts this is incorrect though I was told it is -4 V what did I do
  20. K

    Logic Gate Sim: Get Boolean Algebraic Expression

    any logic gate simulator that gives you the boolean algebraic expression at the end?
  21. C

    Calculating Force on Quarter Cylinder Dam Gate with Hinge and Stopper

    This is a picture of a quarter cylinder dam gate with a hinge at A and a stopper at B. I need to find the force on the stopper at B as a function of the radius (R) and height of the water (h). I was going to do this by working out the moments around the hinge at A. I can solve for pressure...
  22. V

    What are the important subjects for GATE mechanical?

    what are the important subjects for GATE mechanical...?:confused:
  23. V

    Hydrostatic forces on a gate with no width?

    Hydrostatic forces on a gate with no width?? Homework Statement A gate is placed at the bottom of a dam wall at a distance of "H" below the surface (measured from the top of the gate). The gate is hinged so that there is 1.2m above the pivot point and 0.8m below the pivot. A stop is placed at...
  24. C

    Wiring a gate driver correctly (keeps burning out)

    I bought the TC4421 to drive a IRFP250N power MOSFET. I'm using a 12v battery as the power source, and an Arduino to make a square wave input at ~1kHz. I have things wired this way: TC4421: GND to ground VDD to +12v line on battery Input to PWM output from Arduino Output to gate of IRFP250N...
  25. B

    Tri-state logic: High impedance as an input to a logic gate

    So I am well familiar with how bi-state logic (with 0s and 1s) works in gates. 0+0=0; 0+1=1+0=1+1=1 etc. What happens if an input to a gate is neither 0 nor 1, but has an high-impedance value? Will it disable the logic gate from working? Will the logic gate simply ignore that input? Anyone...
  26. F

    Is XNOR Gate Logic Correct for More Than 2 Inputs?

    hi,, i m a bit confused in XNOR gate logic for MORE THAN 2 INPUTS.. is this logic correct "even function of 0's".. need help in this regard,thanks in advance.. :confused:
  27. 1

    Torque calculation of a gate rotating around its pier

    Hey guys, I am new to this forum, I have a problem and I can't get my head around it. so basically, I have a gate that rotates in water about a pier located in the middle (the gate is is 20 m length from the middle pier on both sides, so total length is 40 m). how do i calculate the force...
  28. G

    Force to hold a sluice gate in place

    Homework Statement An incompressible, inviscid liquid of density ρ flows, under the influence of gravity, beneath the sluice gate shown. The height and velocity upstream of the gate are h and V, respectively, while downstream of the gate the height is l. Show that the force per unit width...
  29. T

    Hydrostatics question - angled triangular gate?

    Homework Statement The question asks to find the magnitude of the pressure force on the gate: The Attempt at a Solution Here is the part of the solution: I don't get why zc is 3.667m. Shouldn't it be 3 + (2/3)sin40 since you want the depth of the centroid from the surface to the...
  30. J

    Simulating a NAND/AND gate in Emitter Coupled Logic?

    Homework Statement I need to simulate a AND/NAND gate with Emitter Coupled Logic. As I'm sure that most of you know, ECL is mostly used to make OR/NOR gates, so finding out how to make a NAND/AND gate is not as easy as it sounds. Homework Equations The Attempt at a Solution I...
  31. S

    Standard TTL 2-input NAND gate - open-collector/totem pole outputs

    Homework Statement Question: Refer to Fig. 6-5. This standard TTL 2-input NAND gate uses ______ (open-collector, totem pole) outputs. Solution: The 2-input TTL NAND gate in Fig. 6-5 (which is attached as "TheFigure.jpg") uses a totem pole output configuration. Homework Equations N/A...
  32. S

    Horizontal Force on a Gate Hinge?

    A door is attached to a frame by two hinges and is at equilibrium. All forces and torques are therefore balanced. The door has a mass of 10.5kg, a width of 1.1m, and the two hinges are 0.7m apart. Find the direction and magnitude of the horizontal force applied to the door by the top hinge? I...
  33. Y

    How does a NAND gate work using transistors?

    http://www.dummies.com/how-to/content/electronics-projects-how-to-create-a-transistor-na.html In the above link it is said that the output is logic ON if both the inputs are OFF. What does that mean. Correct me if I am wrong. As far as I have learned from the site was when the input is ON...
  34. R

    Constructing a Toffoli gate with qubit gates?

    I'm looking through Nielson's book on quantum computation and information and in part of it he says that any $C^2(U)$ gate can be constructed from two qubit and one qubit gates. I can't figure out how to do this, or how to verify it (fig 4.8 in his book) I've attached a photo of the diagram...
  35. C

    Engineering Converting logic circuit to using only 2-input NAND gates and NOT gate

    Homework Statement Convert the logic circuit to an equivalent circuit constructed from 2-input NAND gates and NOT gates. http://imgur.com/EzOBdbv Homework Equations Pretty sure the boolean equation is: A & (~(~B+C)+~D + E) The Attempt at a Solution I know for sure that ~A + ~B = ~AB so I was...
  36. H

    Mystery of the Transformed Gate

    hey guys >>> in this morning i woke up ... and Without prior warning my gate Turned to this (look at pic ) 1- What is the reason I want to know? can anybody tell me ? http://hh7.an3m1.com/Sep/an3m1.com_13603318841.png
  37. W

    How can a NOT gate function with a misplaced resistor?

    I found an image on google that I recognised to be an almost functioning NOT gate: But I felt the resistor was misplaced so I changed it to put it here: Who is correct and why? The only way I can see the first image functioning as a NOT gate is if the transistor somehow has a...
  38. J

    Designing a 2-Input XOR Gate: RL=1KΩ, VDD=1.8V

    Homework Statement Design a 2-input XOR with the following specifications: RL = 1KΩ VDD = 1.8V VOL = 0.1V VOH = 1.7V Homework Equations Triode: Id = μnCox W/L VDS (VGS - Vt - VDS/2) Cutoff: Id = 0. The Attempt at a Solution Searching on my book I found the image...
  39. E

    Torque on a hinge to a gate that is 69 inches long

    I have a gate that is 69 inches long and it takes 50 lbs of force to lift at the end of the gate when it is extended at a little over a 90 degree angle. How many foot pounds of torque in a torsion spring will be needed to lift the gate or at least offset the majority of the weight?
  40. Crazymechanic

    Power mosfet proper gate drive current

    Hey guys could you help me out , so I have built this simple smps project that i needed to the multivibrator part works great frequency is stable square wave but then I have these power mosfets IRFP460 , now the multivibrator has two output each 180 opposite to the other I use each of these...
  41. R

    Testing What resources can help me prepare for logic gate problems on the Physics GRE?

    I viewed previous tests on the internet. There are logic gate problems in a test. What subject do this logic gates problems belong to? What book do you recommend for understatnding this subject?
  42. S

    Quantum computing - form a SWAP gate from x3 controlled-NOT gates

    Homework Statement Show that three controlled-NOT gates (for a 2 qubit system) can be combined to form a SWAP gate. The control qubit alternates between the 2 qubits for each consecutive c-NOT gate. (The diagram is Figure 5 of the following notes...
  43. J

    Can XOR Gates Substitute OR Gates in Boolean Expressions?

    Homework Statement i have the equation x(y+z)=f some how it becomes x(z xor y xor zy) Homework Equations The Attempt at a Solution xy+xz xy(z+NOTz)+x(y+NOTy)z x(yz+(y XOR z)) Thanks
  44. R

    Design a logic gate for each different output

    Homework Statement http://media.newschoolers.com/uploads/images/17/00/58/56/03/585603.png Homework Equations None The Attempt at a Solution I have tried just messing around with them, and I have tried to turn this table into a "boolean" expression. I have no idea how I would begin to solve...
  45. Crazymechanic

    What is the Proper Voltage to Open a 350v Rated Power N Channel Mosfet?

    A simple and quick question please clear this up. Let's say I have a 350v rated power n channel mosfet , how much of positive voltage do i have to apply to the gate to fully open the mosfet? I know this varies from type of transistor and so but the average? i am just getting mixed up some...
  46. D

    CprE logic gate problem, possibly unsolvable

    Homework Statement I was having a casual chat with one of my professors and he presented me with a problem that after 4 hours of attempting I believe is unsolvable. the set up is pretty simple. you have 3 inputs x,y,z that go into a system, the output is ~x,~y,~z. However you are only allowed...
  47. Crazymechanic

    Can a Series LC Circuit Effectively Drive MOSFET Gates?

    Hi, I have built some stuff before mainly amplifiers and some power supply modules, tell me what you think of this. I want to ask is it possible to have a series lc circuit that is powered from the rectified + rail through a resistor that gives me the correct voltage and transorb that would make...
  48. I

    3 input XOR gate using NAND gate only ( Logic )

    We can use NAND gate only to get ( XOR gate ) of 2 input ( A and B ) : By using (4) NAND gate : The output of 1'st NAND : (AB)' The output of 2'nd NAND : ((AB)'.A)' = (A'B) The output of 3'rd NAND : ((AB)'.B)' = (AB') The output of the hole circuit will be: ((A'B).(AB'))' = AB'...
  49. R

    Makeing logic gate using only NAND Gates

    Homework Statement How to make a logic gates only using NAND gates of the following diagram. How many NAND gates I would have to use for that diagram Homework Equations The Attempt at a Solution I know that A bar bar + B bar bar =AB A bar bar B bar bar = A+B De-morgans Theorem
  50. E

    Calculating the Resultant Force on a Gate - Is No Force at B Possible?

    I've figured out the resultant force on the gate by adding the magnitudes of F1, F2, and F3. However, I'm trying to figure out the distance b such that there is absolutely no force acting on the stop at point B. Is this even possible? It seems like it isn't, since all forces are pointing to the...
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