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.

Question about drain current of a Class E PA

Status
Not open for further replies.

sharethewell

Member level 5
Joined
Apr 17, 2010
Messages
92
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
2,092
Here is a question about the drain current in a Class E power amplifier. There is on and off state for the switch CMOS transistor. When it is on, the transistor is turned on and current will be dumped directly from the power supply through the RFChoke inductor and the transistor to ground.

1. So is this just a huge waste since the current won't go through the LC tank in series to be delivered to the output?
2. Is only the drain voltage delivered through the LC tank to the output when the transistor is off?

Although when the transistor is on in triode mode, the drain voltage is not zero in reality. Then this is gonna be a huge power dissipation as well? Then how should I size the CMOS transistor width?

Thanks.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top