Line X
to the airplane’s engine
Each tank is fitted with a measuring gauge. Each tank is assigned a digital sensor which will be used to detect the fuel level in the tank.
SETUP SUMMARY
Floaters are used in the tanks. When the fuel level goes down, the floater moves down and then touches line X. line X is connected to an alarm. Once the floater touches line X, a circuit is closed hence the buzzer rings and an indicator is produced that the fuel level in a particular tank has fallen below the recommended limit.
Once a circuit is closed, a logic signal of 1 is produced. The logic signal 1 which is produced indicates a fall in the fuel level of the tanks.
We can construct a total of 4 digital circuits to support the alarm requirement and produce a final action of logic output of 1. Three circuits will take care of each tank whereas one circuit will be
This is an OR truth table. This implies that the alarm will only ring if all the values in each of the three tanks is 0. If any tank has a value of 1, then the alarm will ring.
BOOLEAN EXPRESSIONS as SOP (Sum of products)
A’B’C + A’B C’ + A’ B C + A B’ C’ + A B’ C + A B C’ + A B C
= BC(A’+A) + AB’(C’+ C) + BC’(A’ + A) + A’B’C
=A’B’C
Advantages of NAND gates
- They require fewer transistors and they switch faster than the AND gates
- They are less costly
- Fewer connections are used hence low circuit complexity
- They consume less amount of power
- They have a higher performance as compared to other logic gates.
Level sensors
The level sensors are used to detect the level of substances that flow in a given system. Thu substances can include: liquids, granular materials and powders. The substances flow due to gravity as they are consumed and whenever they reach some levels in the system, a signal is sent and an alarm beeps. The substance being measured is usually placed inside a container and then the level measured. There are two types of level sensor; the continuous level sensors and the point level sensors. The continuous level sensors are used for measuring the level of a substance within some specified range whereas the point level sensors are used to indicate whether the substance is either above or below the sensing point. It detects levels that are either excessively high or low.
Output buffer circuit development
This involves an integration of a sampling gate circuit which has dual output functions. The sampling gate circuit used above uses a slew enhancement technique which is used to achieve a slew rate. This slew rate features a built-in buffer which maintains a constant input impedance. (Ye Qiang,Lai Xinquan,Chen Fuji,Li Yanming &Yuan Bing, 2008) The sampled pedestal are minimized by a special on-chip clock generation circuits. At this point, the power dissipation needs to be less than 300mW including the output driver. Circuit devices can be optimized through ht use of circuit simulation computer models. Each response in the circuit is a function of several input variables which include some factors which can be set in the engineering design and noise factors. The non-linearities are then identified without any form of explicit assumptions about the functional form. (Ye Qiang,Lai Xinquan,Chen Fuji,Li Yanming &Yuan Bing, 2008)
References
1. Ye Qiang,Lai Xinquan,Chen Fuji,Li Yanming,and Yuan Bing(Institute of Electronic CAD,Xidian University,Xi'an 710071,China);Design of an On-Chip Gate Pulse Modulate Controller for a TFT-LCD[J];Journal of Semiconductors;2008-08
2. WEI Tingcun GAO Wu(College of Computer,Northwestern Polytechnical University,Xi'an,710072,CHN);Research of One-chip TFT-LCD Driver IC[J];Research & Progress of SSE Solid State Electronics;2008-02
3. WEI Tingcun CHEN Sheng ZHENG Ran(College of Computer,Northwestern Polytechnical University,Xi'an,710072,CHN);Reset IO Circuit with Spike-rejection Using Capacitor Delay and Feedback[J];Research & Progress of SSE Solid State Electronics;2009-04
