Low Power High Frequency MOSFET

[cannibol_90]

What are Low-Power High-Frequency MOSFETs? Please, can someone mention the characteristics of such MOSFETs. Are there such MOSFETs available in the market today? Any articles been published on these MOSFETs? Please let me know.

I need information on this type of MOSFET to design a low-power high-frequency transceiver section.

Kindly help me.

 

[crutschow]

What is the frequency and power?

 

[cannibol_90]

The frequency is in GHz (ISM Band) and the power is of the order of a few mW (Ultra-Low Power). Less than 1mW of power would be excellent.

 

[BigBoss]

The frequency is in GHz (ISM Band) and the power is of the order of a few mW (Ultra-Low Power). Less than 1mW of power would be excellent.

Which ISM band and what is your purpose ?? "Low Power MOSFET" term does not tell me anything.What would you do ??

 

[dick_freebird]

Look for "RF LDMOS" like from NXP, Freescale et al.

 

[cannibol_90]

Sorry BigBoss! Actually, I have to design a 900MHz Ultra low power FHSS transceiver. Now, can you kindly help me in providing some information?

 

[dick_freebird]

At that power level you may not find anything suitable,
most mW-range radios in low cell band are long since
integrated. 100mW (+20dBm) is well within the working
range of a stack-of-two 3.3V RFSOI technology's basic
NMOS (which should hang just fine at 900MHz) and
many have some sort of extended drain / LDMOS option
(like TowerJazz CA18 180nm has 5V/12V devices on many
sub-flows, JI or SOI, aimed at precisely such applications
with only the DGO and X/Y layout rules being different
from the core flow).

At mW levels you are really talking small signal and you
have numerous other options such as JFET/MESFETs in
silicon, GaN, GaAs, SiGe discrete HBTs and so on. You
are not really looking for a power device and maybe this
is confusing / unduly constraining your search.

 

[BigBoss]

Sorry BigBoss! Actually, I have to design a 900MHz Ultra low power FHSS transceiver. Now, can you kindly help me in providing some information?

It's pretty difficult to find a discrete RF MOSFET except Dual Gate MOS transistors.But instead, you can use GaAs pHEMT devices from www.avagotech.com that has similar charateristics.There are many pHEMT manufacturers such as Avago,Renesas for 900MHz applications.Low power is absolutely depended on design not on transistor itself.

 

[cannibol_90]

At that power level you may not find anything suitable,
most mW-range radios in low cell band are long since
integrated. 100mW (+20dBm) is well within the working
range of a stack-of-two 3.3V RFSOI technology's basic
NMOS (which should hang just fine at 900MHz) and
many have some sort of extended drain / LDMOS option
(like TowerJazz CA18 180nm has 5V/12V devices on many
sub-flows, JI or SOI, aimed at precisely such applications
with only the DGO and X/Y layout rules being different
from the core flow).

At mW levels you are really talking small signal and you
have numerous other options such as JFET/MESFETs in
silicon, GaN, GaAs, SiGe discrete HBTs and so on. You
are not really looking for a power device and maybe this
is confusing / unduly constraining your search.

OK! So what about 0.18um SiGe BiCMOS technology using HBT transistors? I believe I am in for mixed signal design. I don't know where to start. Please help!

 

[dick_freebird]

Sure, the SiGe 0.18 from any foundry ought to be more
than capable. Cost is less favorable than a RF CMOS.
Noise performance (esp. if you want to integrate the
RX LNAs) ought to be better using an HBT.

I believe you can find many, many papers on integrated
RF lineups for cellular at this technology node, probably
5-10 years back by this point. The RF conferences were
bubbling with that kind of thing back in the day.