[SOLVED] power amplifier placement

[jeffrey samuel]

Why is the current rating of the signal is amplified last and not in the begining

what will happen if we use a CC to amplify the ip current then amplify the voltage of the signal

Is it feasible or not

do clarify me

 

[Tahmid]

The voltage is amplified and the current is "amplified" according to the load resistance.

 

[BradtheRad]

It is not easy to send high current at low voltage through typical amplifying devices. They will need to be driven at very low ohms. Furthermore the PN junctions have a 0.6 V threshold to be overcome.

Another reason is that pre-amps (speaking of audio) create less distortion in class A operation. Some pre-amps run at tens of volts. Although class A is inefficient, a low current level does not waste much power.

 

[jeffrey samuel]

prime concern is the power lost then what abt the voltage amplified which cos power dissipation right

 

[Tahmid]

prime concern is the power lost then what abt the voltage amplified which cos power dissipation right

Prime concern isn't necessarily the power lost. You wouldn't be using Class A then.

 

[jeffrey samuel]

Yeah that has very low efficiency i thought of class B or AB amplifiers since it is a radio signal Class C also sounds promising but my doubt is where should I amplify the current of my signal

 

[Tahmid]

Amplify the voltage and you will get increased current since current is proportional to voltage (the resistance is constant).

 

[jeffrey samuel]

this is my need pal after voltage amplification my power rating of the signal is 10 mW I want to increase it to around 2W what should I do then