good practices in circuits

[nalino]

All,

Is there any guidelines for basic common senses and good practices of making circuits, such as

1. impedence matching
2. termination methods and where they should be used
3. why/when you should need a dumping resistor
4. how to reduce the nosie at Vcc input of ICs
4. the usage and methods of capcitors
5. the reason why you need a pull-up or pulld down resistors..

Let's share all your experiences, site links, books...etc.

Thank you in advance..I wish this thread would help designers..

Rgds

 

[siongboon]

There are some common practices in circuit design.
These are often deploy without any further detail thoughts of the effectiveness.
It really depends on many factors.
All I can say is that when there is problem in the circuit,
there will still be a need to look into proper design.

After copying a number of circuits,
what I observed is as follows....

1. impedence matching
-I guess you mean line matching for high freq signal. I don't have much experience to comment on this point.
2. termination methods and where they should be used
-same as Q1
3. why/when you should need a dumping resistor
-depend on your circuit and what you want.
4. how to reduce the nosie at Vcc input of ICs
-normally 100nF capacitor is placed very close to the IC. depending on the source of the noise, you may need other solution.
5. the usage and methods of capcitors
-Capacitor is normally use to stablise voltage and as a filter. You can also view it as a component to remove or allow AC signal. Many use, depending on how you use it.
6. the reason why you need a pull-up or pulld down resistors..
-If it is possible that your circuit will cause an signal line floating
with no define voltage, and you don't want that to happen.
You may want to tied it to either Vcc or Gnd.
It may save you some power if you tied it correctly.
Depending on what you want, what you want to design.

Best Regards,
Siong Boon

 

[Kral]

nalino,
Here's a link to an excelent article by Paul Brokaw, entitled "Amplifier Users' Guide to Decoupling, Grounding, and Making Things Right for a change".
www.edn.com/archives/1994/112394/24df1.htm
Regards,
Kral

Added after 17 minutes:

I gave you the wrong link, although the article at the link I gave is good. The link that I intended to give you is **broken link removed**
When you get there, scroll down and click on "AN202.pdf".

 

[nalino]

Thanks pals. Actually, I happened to know how much the grouding and shielding is important after starting real works.

What do you guys think, starting a new category and pile all these info. there..?