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hi,guys
I'm designing a UHF diode detector,the diode's output voltage's response time(rise/fall)time should be a few ns;I searched some functions,they said the Rv or Rl
of a diode should be decreased,but If Rv be decreased,then the Ib should be increased,but IBV has a limit. If we...
uhf dipole antenna
Hi,vfone, I've read the website you refered, the function is so complexed,so I can't get more information from it, Thanks anyway.
Hi,FVM, because our tag chip's output ports are diference,so the use of dipole is convient for match(not need a balun), and the good of...
microstrip dipole antenna
Hi,all
I'm working on a project about designing of UHF RFID tag antenna, I've searched
many articles,but few were found on microstrip dipole antenna, lots of dipoles antenna are not the type of microstrip. because we hope the back of the antenna is metal ground ...
Re: question about LO leak and LO+2*IF leak in a transmit br
I measured the PA, the gain of PA at RF and LO and LO+2*IF frequency are almost the same(difference<1.5dB). For the RF is in UHF band, and the IF is only 21.4Mhz.
hi,all.
Recently I designed a transmit branch,including:mixer+filter+driver 1+driver 2+
PA(use GaAS FET matched by cap and ind). Now comes a problem: when measure
the branch at the driver2's output,the LO leak and LO+2IF leak are both about -70dBc(the PA doesn't work). But when measure at PA's...
Re: what's the relationship between amplifier's linearity an
Thank you for replies! I'm sorry I don't describe my question clearly.
The main point I wonder if there is relationship between noise figure and linearity
in physical essence of transistors or FETs. I find some facts that...
Hi,everyone. the past days, I've an argument with my workmates. I think there's
big relationship between NF and linearity(such as IP3) of an amplifier,but they
say the NF basically has nothing to do with linearity. and factly, we've find no book
or articles about this topic,could someone...
hi,all
I need a DCDC to rise source power 3V to 12V (with output current 2A)for my RF MOSFET. I've searched a lot,but cann't find an appropriate one. Will someone be kindly enough to introduce some to me ,Thanks a lot...
Hi,all
Our project need a RF receiver IC, main requirement as below:
Sensitivity: -105dBm, Frequency band: around 360MHz width=20Mhz
Gain: ≥110dB IF:21.4MHz( width>100KHz)
I searched many corps, although there some products, what I need is only
the RF part (for the baseband part is...
400mhz 10w pa
Great thanks to all.
To bouli, I wonder if I use a BLF1822 which P1dB is 10W under Vds 28V,could I achive P1dB of at least 4W under Vds 12V? I thinks the output power should
decrease 10log(28²/12²)≈7dB. So the output power under Vds 12V supply may
be 40dBm-7≈33dBm. is it...
blf1822+data sheet
Thanks to carrier,I viewed the RA07H3340M datasheet of Mistubish.I found it good at nealy all aspects except its linearity. For the reason of modulation methods, the linearity is important for my PA.I wonder if you've used it, its linearity
can be achived well by tunning its...
400mhz 5w pa
thanks a lot to Bouli!!
Although the PA's required size is so small, the heat problem is not big. because under the technical requiments, the Tx (PA working)time is quite short, you can take the Tx signal as pulses ! The intermodulation index is quite important...
mrf1517 application notes
hi,everyone.
I got the job to design a PA at 400MHz, with P1dB>4W,the Vd<12.5V.
I have searched many many datasheets such as Minicircuits,triquint, as well as
freescale,philips,infeon and so on.But I can't find a good module or a discrete transistor.
Since the key...
Hi,everyone
Is there the type of chip with mxier and amplifier integrated together? the Rf of mixer is about 400Mhz and the IF is 21.4Mhz, the required gain of amplifier part had better
to be more than 80dB. If not,Pls introduce some single IF amplifier chip with the gain of more than 50dB...
21.4mhz
The filter is to be used in a RX module as an IF .
It's maybe hard to design such band filter with LC under the technical index:
Center frequency:21.4MHz, Passband=100KHz, Rejection at 21.4MHz±150KHz>44dB
I.L.≤5dB.
I try to find some crystal filters, but I cannot find a one with...
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