Rf Power transistor

[Johan H. Skjřrdal]

Hi!
I need a high power rf transistor. It is going to work in a ballanced
push-pull coupling, delivering 44dBm out. I need the transistor to be in a
package of two transistors. The gain has to be at least 12dB. The frequency
band of operation is from 600 to 1000 MHz, and the large signal operation
over this band should be reasonably flat.

If anyone have suggestions about this, I appreciate it! Maybe someone even
know about designguides about this?

Than you!

Johan H. Skjřrdal

 

[Georg Acher]

In article <3f783e58@193.71.169.73>,
"Johan H. Skjřrdal" <johanhs@start.no> writes:
|> Hi!
|> I need a high power rf transistor. It is going to work in a ballanced
|> push-pull coupling, delivering 44dBm out. I need the transistor to be in a
|> package of two transistors. The gain has to be at least 12dB. The frequency
|> band of operation is from 600 to 1000 MHz, and the large signal operation
|> over this band should be reasonably flat.

Hm, this is not going to be cheap ;-) The MRF648 have enough power (~50-60W), but
reach only 500-600MHz with lousy 4-5db gain (as most other bipolar transistors).

My best bet would be some of the Mitsubishi FETs (MGF090x), which have good gain
at that frequency. Unfortunately, your needed frequency range is not very
common, otherwise some modules would be interesting...

Maybe you can find something useful here:

http://www.mitsubishichips.com/common/cfm/eContentDriver.cfm?FILE=mw_datasheet_index.html

--
Georg Acher, acher@in.tum.de
http://wwwbode.in.tum.de/~acher
"Oh no, not again !" The bowl of petunias

 

[Active8]

In article <3f783e58@193.71.169.73>, johanhs@start.no says...

Hi!
I need a high power rf transistor. It is going to work in a ballanced
push-pull coupling, delivering 44dBm out. I need the transistor to be in a
package of two transistors. The gain has to be at least 12dB. The frequency
band of operation is from 600 to 1000 MHz, and the large signal operation
over this band should be reasonably flat.

If anyone have suggestions about this, I appreciate it! Maybe someone even
know about designguides about this?

Than you!

Johan H. Skjřrdal

your requirement of 2 in a pkg may be a prob, dunno.

just a rough guess. if motorola gave up the MRF183, on semi may have
picked it up. 12dB Gain at 1GHz Pout 45W Pin 2.8W 55% efficiency in
class A mode. this one doesn't have test circuit data like some do.

i don't think the thing is going to have flat response. you'd need to
deal with that.

i'd check the websites and even pick up the phone.

brs,
mike

 

[Rost]

I Think You need SiGe HBT. It works over 1GHz and have good noise
perference.
Johan H. Skjřrdal <johanhs@start.no> ÓĎĎÂÝÉĚ × ÎĎ×ĎÓÔŃČ
ÓĚĹÄŐŔÝĹĹ:3f783e58@193.71.169.73...

Hi!
I need a high power rf transistor. It is going to work in a ballanced
push-pull coupling, delivering 44dBm out. I need the transistor to be in a
package of two transistors. The gain has to be at least 12dB. The
frequency
band of operation is from 600 to 1000 MHz, and the large signal operation
over this band should be reasonably flat.

If anyone have suggestions about this, I appreciate it! Maybe someone even
know about designguides about this?

Than you!

Johan H. Skjřrdal

 

[Ted Johansson]

There are no commercial SiGe power devices for 44 dBm power levels!

An ordinary LDMOS FET would perform OK at these frequencies and power
levels. The problem is to find a product that is aimed for this broad
frequency band.


/Ted


Rost wrote:

I Think You need SiGe HBT. It works over 1GHz and have good noise
perference.
Johan H. Skjřrdal <johanhs@start.no> ÓĎĎÂÝÉĚ × ÎĎ×ĎÓÔŃČ
ÓĚĹÄŐŔÝĹĹ:3f783e58@193.71.169.73...

 

[Active8]

In article <bde7b293.0309301028.16961864@posting.google.com>,
tedde@pobox.com says...

There are no commercial SiGe power devices for 44 dBm power levels!

i didn't suggest that, so don't yell at me, yell at Rost. don't know how
you messed up your reply.

An ordinary LDMOS FET would perform OK at these frequencies and power
levels. The problem is to find a product that is aimed for this broad
frequency band.

well, the one i suggested is. HF to 1GHz.

mike

/Ted


Rost wrote:

I Think You need SiGe HBT. It works over 1GHz and have good noise
perference.
Johan H. Skjřrdal <johanhs@start.no> ÓĎĎÂÝÉĚ × ÎĎ×ĎÓÔŃČ
ÓĚĹÄŐŔÝĹĹ:3f783e58@193.71.169.73...