Class E Power Amplifier

Status
Not open for further replies.

khouly

Advanced Member level 5
Joined
Oct 20, 2003
Messages
2,350
Helped
461
Reputation
916
Reaction score
102
Trophy points
1,343
Location
EGYPT
Activity points
13,242
i want to design class E power Amlifier for 900 Mhz application , and i want to know where to start ,
so please recommend a book , or paper to begin with

and i saw most of the class E amps use LDMOS or CMOS , or HBT , what about biploar devices are they used in this class

and also i want to ask how to select the bias point of the gate or the base


thanks in advance

khouly
 

Search for Sokal and/or Raab. They wrote the book Solid State Radio Engineering and they are big in Class E.

for instance:

h**p://www.avtechpulse.com/papers/classe/
 

    khouly

    Points: 2
    Helpful Answer Positive Rating
you can use bipolar decices.

But FETs are more useful for switch-mode devices.
Bipolar devices go to deep saturation, it will make slower they operation.
 

    khouly

    Points: 2
    Helpful Answer Positive Rating
i have seen class E amps based on LDMOS devices , i will try to get a model of one , and begin to design using the LDMOS

khouly
 

what about the base bias of the transistor if i use Bjt will be like class AB or just put the input wave form in the base

khouly
 

The latter case: no any bias as much as a Class AB bias, only just a little (say 0.2-0.3V DC, definitely not causing any collector current) to easy the RF drive at 900MHz, this helps the obviously not so rapid rise time of the drive pulse.
 

    khouly

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…