Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

DC load line of amplifier

Status
Not open for further replies.

Freestylesoap

Member level 3
Joined
Aug 23, 2016
Messages
62
Helped
0
Reputation
0
Reaction score
0
Trophy points
6
Activity points
502
Hi all,

I have a self-designed amplifier and need to find a load line to get higher output power. I use ADS for simulation. Does anyone have an example or know how to start?

Thanks,
 

You probably need to create more extreme action in your transistors. Bias them so they create larger swings of voltage and current. Is this correct? Make sure they are biased to correct amounts, that is, so the device conducts in a range which is (a) just above its minimum and (b) just under its maximum.

Reduce resistors in emitter legs, to increase sensitivity.

Do you have an N-device at the high side with a positive polarity supply? If you wish to turn the transistor on fully, you must bias it with an input signal whose amplitude is as great as your desired output voltage. (The same applies for a P-device in a symmetrical position with a negative supply.)

Is your amplifier class A? This configuration is fine for low power (example, pre-amp stage), but if you want high power then you should consider another topology.

If you are using mosfets instead of transistors, then translate the terms accordingly.
 

Hi all,

I have a self-designed amplifier and need to find a load line to get higher output power. I use ADS for simulation. Does anyone have an example or know how to start?

Thanks,

Find max. Id/Ic and Vcc/Vdd from data sheet and draw a straight line between Idmax and 2Vdd on a scaled chart.This is your Load Line.
Obtain IV curves in ADS and define your OP on this line that crosses one of the IV curves, this is your OP for A-Class PA.
Take precautions to put some safety margins and start to design.
There is a very nice Design Guides for PAs, use them to go forward..
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top