## Friday, 19 October 2012

## Sunday, 14 October 2012

### Impedance matching–What does a mountain bicycle has in common with a transformer

As a cyclist and a transformer user, can’t help to notice the similarity of the two. So below is the picture of a mountain-bicycle and transformer taken from my favourite source Wikipedia.

To compare them, look at the table of comparison below:

A Bicycle | A Transformer |

number of “teeth” of sprocket | number of winding |

front sprocket | primary winding |

rear sprocket | secondary winding |

gear chain | transformer core |

now, isn’t this amazing?

To understand sprocket, visit http://en.wikipedia.org/wiki/Sprocket

Pictures from :

http://en.wikipedia.org/wiki/Bicycle

http://en.wikipedia.org/wiki/Transformer

To understand sprocket, visit http://en.wikipedia.org/wiki/Sprocket

Pictures from :

http://en.wikipedia.org/wiki/Bicycle

http://en.wikipedia.org/wiki/Transformer

## Friday, 5 October 2012

### Getting to know simulation - Part11 - Monte Carlo

To best
illustrate the usefulness of the monte-carlo
simulation, let’s use a voltage divider as example.

Run Transient simulation and get:

So this is
a perfect voltage divider. But we all knows that resistor has tolerance, let’s
say each of R1, R2 has 1% tolerance. We should factor this in by running Monte Carlo simulation and see what are we dealing with.

Enter 1% as
the resistor tolerance.

Tick “Enable
multi-step” to enable Monte-Carlo analysis

Set number
of runs to 100

Re-run the
transient simulation to see gain statistic of divider made of 2 pieces of 1% resistor.

With resistor tolerance of 1%, the voltage divider will give an error of ~-0.9% to ~+1%.
Use of Monte-Carlo simulation will ease such analysis. If your application cannot tolerate such variance, then resistors with better tolerance are needed.

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