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Hi all,
Do you have any documentation or experience in building a wake-up circuit? I am building high power amplifier arrays. And in order to solve the heat problem, I plan to trigger the power supplies and thus want to use the same thing used in the cell phone.
Thanks,
James
Thanks. I do have their spec. Instead of putting all the values into a txt file that AWR can read, is their a more accurate model for me to use? Say a model with output capacitandce, feedback capacitance. I have used Infineon transistors, they all provide equivalent circuits that you could put...
Hi all,
I am having trouble when I tried to simulate RF PA circuits using AWR Microwave Office. I contacted the FREESCALE SEMI and they said they won't provide any model due to privacy. ADS does have some. Do you have any idea how I can get those high power RF power transistors, say MRF171A...
octave bandwidth definition
Yea, thanks for that. For example, one octave bandwidth means the bandwidth is equal to the lower frequency. What about sub-octave and 1/3 octave? Thanks.
Hi,
I want to find some power MOSFET over 30 watts, and hopefull internally matched. The frequency it is operating is 200MHz and the bandwidth needs to be only several k. Do any of you have any experience in that?
Thanks,
James
I am working on transmitter for the tranmist SENSE right now. I have started for nearly 8 months and found it really amazing. It is a bit more specific than general RF engineers. What kinda coils are you working on by the way? Are you in the States?
Hi all,
I used to work on W-CDMA PAs and now I am working on MRI hardware for my PHD. Anyone works on that as well? Maybe we can share some ideas.
James
connector dxp library
Hi all,
I am trying to find 62-pin card edge connector in PROTEL DXP library. Anyone has any idea where I can get it without drawing it by myself? And one more question, if the card edge is not gold-plated, how much will it affect the board? I am using it as DC supplies...
I am trying to build something to completely control the phase and amplitude of the RF current (linear to the input power). What I used before is simply a MOSFET and I find it does not work well in high power region (~42dBm). Could you think of anything else that could work the same as a MOSFET...
Re: rf current source
Well, my problem here is the power level is nearly 30dBm. Most BJTs cannot operate linearly at that region. I am thinking of using MOSFET at the saturation level. But at the same time, the linearity is sacrificed a lot. That troubles me a lot.
rf current source
I have problem building a current source. I need the output of the amplifier circuit to be like a current source. Any suggestions for that? And I might need to control it freely.
VGA help
I am trying to build a single-channel transmitter of a medical system and later extend to multi-channel. I tried to use vector modulator and VGA to make it work. But the problem is the control of the VGA. I am not familiar with the digital interface (if I am using a digital variable...
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