Post subject: CMOS for Class E Amp..
Thu Apr 22, 2004 3:15 pm
I am looking for any information
of the CMOS which can be used for Class E Amp.
If you have anything
for it, plz reply.
Post subject: Google to the rescue
Unread postPosted: Thu
Apr 22, 2004 10:48 pm
Joined: Sun Aug 03, 2003 2:02 pm
Here's a good place to start if you
don't have much to go on yet.
If you can't find what you want there, you
might try providing information more specific to your application.
- Kirt B. :mrgreen:
Post subject: Re: Google to the rescue
Unread postPosted: Fri Apr 23, 2004 9:16 am
Thank you for
I've got some papers there. I am the beginner for
it, so I am still hang around..
If I need moe after studyng,
I will post again.
a good place to start if you don't have much to go on yet.
http://www.google.com/search?hl=en&ie=U ... +amplifier
If you can't find what you want there, you might try providing
information more specific to your application.
- Kirt B. :mrgreen:[/quote]
Post subject: class e amplifier for 1800MHz
Wed Apr 28, 2004 3:41 pm
For RF, cell phone application
it is no no. Just buzzword. There are some academic articles running
the amplifier in switched power supply. There are never mentioned
real-life measurements. :lol:
What it means - FM modulation
of FSK (GSM) needs AB class amplifier operation, or little bit linearity
to mathc the FCC/ETSI spectral mask. The overall efficiency is already
set by the AB class bias.
Linear modulation - direct E class
operation is BS. The device could be run in switched mode, processing
only the phase information on input. Works like NAND gate. Vcc is
modulated by the signal amplitude envelop. Overall result - expenses
for filtering and additional circuits will kill overall advantage
in efficiency. And FCC will seize it.
Audio - could be done
as PWM pulse width modulation. Filtering the output with cap, you
get the RMS of pulsed signal. Caveat - you can not run any RF sensitive
device, receiver etc. in the vicinity of this broadband spectrum
generator. FCC/ETSI will hunt you as a vermin for poisoning shared
public frequency spectrum.
Opinion - the reused idea of switched
power supply with high effieciency is only switched power supply.
It is not power amplifier. Academics use the buzzwords "class e
amplifier" to attract financing.