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msmukund2000
12-03-2004, 05:48 PM
WHY IS IMPEDANCE MATCHING NECESSARY?
WHERE SLD IT BE USED?
bye

sumandeep1984
12-04-2004, 09:01 AM
Hi,

Have you heard about "maximum power transfer theorem". Well, it states that if the source & the load have matched (equal) impedance then the load get's the maximum power.

A simple example would be a V volt cell with internal resistance r, with a load R. Just calculate power in the load in terms of V, r, R. You will find that's maximum when R = r.

That is the reason behind audio systems mentioning the required speaker impedance 4 ohm, 8ohm, 16ohm etc. This is also used in wireless transmitters to get the maximum transmition power.

vidur
02-22-2005, 10:01 PM
Impedance matching is to be taken very seriously in RF circuits...in DC ckts practical thumb rules are mot as stringent

Usually comes in hand to design treansmission lines, attaching antennas, designing amplifiers...etc...

Plus much more...

Since you are new to this, take a course in circuit theory
Vidur