• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Logic gates

Extracts from this document...


Task 1 For each of the gates listed below, explain their operation showing appropriate gate symbols, truth tables and logic equations for the outputs in terms of the input variables. a) Two input OR gate Logic gates process signals which represent true or false. Normally the positive supply voltage +Vs represent true and 0V represents false. Other terms which are used for the true and false states are shown in the table on the right. It is best to be familiar with them all. The output Q is true if input A OR input B is true (or both of them are true): Q = A OR B An OR gate can have two or more inputs, its output is true if at least one input is true. Input A Input B Output Q 0 0 0 0 1 1 1 0 1 1 1 1 Traditional symbol IEC symbol Truth Table b) Two input AND gate The AND gate is a digital logic gate that implements logical conjunction - it behaves according to the truth table to the right. ...read more.


the NOR gate Z = A.B.C + A.B.C + A.B.C + A.B.C A B C Z 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 1 0 Task 5 For this task I was asked to produce a minimized circuit. I did this by using the karnaugh map below. BC A 00 01 11 10 0 1 1 1 1 1 The minimized equation for this circuit is: A.B + A.C + B.C I built this circuit, using the same equipment as previous, such as the logic probe etc. this circuit does the function as the original circuit, but only this time there are less components used. This has many benefits, as it makes the entire circuit cheaper to build, and the person building the circuit is less likely to make a mistake in the construction of it. Task 6 Compare and contrast, with reference to five characteristics the differences between the 2 types of logic family listed below. ...read more.


On the CMOS, the delay ranges from 95-40ns. The propagation delay time, is the time it takes to send the signal from the sender to the receiver. TTL would be the best suited for changing signal outputs quickly. The TTL supply current ranges from 11-33mA. CMOS ranges from 1-30A. the CMOS chip requires less amps to operate, so for it would be better suited for low power circuits. The TTL needs 4.75-5.25V, whilst CMOS chip requires between 3-15V. this means the CMOS chip would be the best for altering voltage. This makes CMOS the most useful. TTL can operate at a temperature range of 0-70C. The CMOS chip again beats this, because it has a superior temperature operating range of -40-+85C. CMOS wins this because it is best suited to large temperature changes. The high level output voltage on the TTL chip is 2.4v, whilst the CMOS has an output voltage, of 2 thirds that of the input voltage. E.g. if the input voltage is 5V, the output is 3.333V. In conclusion I feel that the CMOS chip is the superior chip for today's demands. The only area that CMOS is outperformed by TTL is the Propagation Delay Time. This means CMOS is a great chip. ?? ?? ?? ?? Gavin O'Hara ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Design and Technology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Design and Technology essays

  1. Bedside table development evaluation

    We love the chocolate brown gloss paint as we have that same paint on our wardrobe so the bedside table would look right at home in our room. QUALITY & TESTING: > Must be value for money, and cost less �30 to make as I would like to make 50% profit, so I will be selling my product for �60.

  2. Devlopment evaluation of my bedside table.

    The length and width of drawer are both 400mm which will give enough space to hold roughly 10 tablet boxes and a range of other medicines. The drawer will have a depth of 225mm so items such as medicine bottles and deodorant cans can stand in the drawer.

  1. Research in the uses of silicon

    In fact it is amazing how rare native silicon is with 25.7% of the Earth's crust being silicon. Silicon, binds strongly with oxygen and is nearly always found as silicon dioxide, SiO2 (quartz), or as a silicate (SiO4) Silicon has been found as a native mineral only in volcanic exhalations and as tiny inclusions in gold.

  2. It is important that Sarah is blind having access to speech and Braille output ...

    Technology and Braille complement one another. Technology will enable Braille to continue to progress and eliminate its drawbacks. Leaders of services for blind people must, then, make every effort to improve Braille education, to encourage reading, implement action geared to standardizing and disseminating the code, and support research to innovate and adapt it to the demanding world of technology.

  1. Describe the benefits of technological developments in equipment and facility design in two contrasting ...

    The football has changed their balls in that there are different colors balls depending on weather and both sets of balls have been made more aerodynamic over the years. * The fast dry courts in tennis have an irrigation system underneath which stops the courts from becoming waterlogged.

  2. The Characteristics and Development of RFID - Radio frequency identification.

    Consequently, it helps manufactories to gain real-time visibility into customer purchase decisions throughout the value chain, which prepare firms to react and influence the marketplace. Cited from Rose (1996), "An inspection of technological changes in terms of supply chain management over the last 20 years has illustrated that there have

  1. Printed Circuit Boards.

    The next step to making a printed circuit board is to design the artwork of the printed circuit board. The artwork (or layout) is the pattern that is to be etched in the copper. The artwork can be produced in many ways also; the traditional and popular method is by

  2. The Differences and Assimilation of Chinese and American Diet

    Different cuisines made by different places show their strong regional characteristics because of their geographical and climatic factors, they have large differences in their tastes of which kind of food they enjoy. In west China, people love sour food because where they live contains a lot of calcium in the soil and water to the surrounding areas.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work