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Hi all,
as I understand it, a PA's load impedance can be optimized for different parameters like linearity, output power, or gain. Why is it that all of the PA ICs I see from mainstream manufacturers like Skyworks and Qorvo have very good S22? This imples gain optimization...One thing I note is...
thanks for the reply. Lets say there's no multipath, strictly only doppler effect. I'm thinking that doppler is just compressing the signal in time, so if I speed up the "time" of the receiver, then doppler corrected. Any thoughts?
additional question: suppose I have a satellite link sending an...
Hi all,
suppose I have an OFDM signal coming from a source moving towards me at high speed. The symbols will be compressed in the time-domain resulting in an upwards shift in the center frequency, and a broadening of the signal bandwidth. The question is, can I correct this by simply using a...
I have a spectrum analyzer. The problem is exactly that I can't make the wifi transmit continuously. So how do I view the spectrum? With the Wifi signal turning on/off all the time, the switching can be seen as a modulation to the actual Wifi signal, and it causes the sidebands to look much...
Hi all,
I want to view the spectrum from my Wifi radio card, but I don't want all of the switching noise. i.e. I only want the spectrum during the actual transmit intervals. Can anybody recommend the best possible way to do this, even if it requires expensive equipment? I understand it may...
Hi again, thanks for the reply. I was referring to the actual 3dB bandwidth of the signal (I think they measure it as -6dB for Wifi but don't quote me). Anyway I did a bit more reading and found out that they increased the number of OFDM subcarriers from 52 to 56 between 11a and 11n (sneaky)...
I just shook it up and down hoping the response would change :P...joking aside, I'm still in the midst of debugging. The main purpose of this post was to try and find out what effect my colleagues were referring to...
I was also wondering why this effect wouldn't be captured by s-parameters...
I understand that, but if you go back to my original post, I mentioned that this effect was not observed in simulation. I have the s-parameter models of all components involved, but simulation results don't predict the level of passband ripple that I'm seeing in my measurement (in fact the...
Thanks. That looks like it. Any clues as to why triple transit echo is not modeled by s-parameters?
Aaron
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Normally the s-parameters themselves dont change (to my knowledge anyway)...
Hi all,
I am testing a design which uses a SAW filter as part of the chain, and I have noted that unless I pad the inputs and outputs with 50-ohm attenuators (about 3 dB each), the passband ripple is horrible. I have simulated (S-parameters) the SAW filter in its normal environment which is in...
I calibrated the signal power level. I will double check how accurate I was.
I intend to check out the power supply today. Actually the results are good compared to those reported online for the same application. The main thing is I cannot reach the datasheet level.
Bare in mind that this is...
Hi all,
I am measuring the sensitivity of some radio cards, but I am unable to reach the expected sensitivity level. The sensitivity criteria is based on packet-error-rate, and I am using an RF shield box with the last 30-dB of the path loss inside the box in order to shield the card from...
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