electronics newbie doubt!!!!!

Thread Starter


Joined Jul 25, 2009
hello i am newbie to electronics and i am really fascinated to know about amplifiers.So i want to know these things my dear friends

1)why should amplifiers have high input impedance and low output impedance.

2)is this true,as bandwidth(of signal)increases the distance of transmission(of signal)also increases

3)if someone say the gain of the amplifier then what gain does it mean is it voltage or current or power?

4)what is internal junction capacitance?

5)what is the use of phase shift 180* when compared to 0*,90*,270*(*-degrees)

6)when using wireless routers they say 3GHZ what is it.they say something about range of 3GHZ or something.

if you could help me it would be much appreciable.thank you!!!!