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Hello everybody!!
I need to design a tunable bandpass filter 910-1150MHZ center frequency and 20MHz bandwidth to included in a bigger design. I haven't been able to find many articles-white papers-books or former design in the web. Could please anybody help me, ideas, papers, resources???? The...
Re: Is it possible to design an antenna for both 2.4G and 5.
are you thinking in a wide band antenna(more than 1 octave) or just an antenna covering two narrow and differents bandwith?????
Helicoidal antennas are used for wideband but i don't really know if it could be a good idea having in...
AS i can remember, you could use two different mixers with just one vco:
-a second armonic mixer
-the usual mixer
Added after 4 minutes:
AS i can remember, you could use two different mixers with just one vco:
-a second armonic mixer
-the usual mixer
Added after 4 minutes:
AS i can...
2.5 ghz frequency counter
I supose you can only measure frequency in continious wave signals. can you also measure pulse radiofrequency signals up to 1 GHZ?
thanks
DAVID
Re: System measuring amplitude & phase difference of 2 s
Analog devices has a chip(AD8302 I think) which gives you voltages proportional to phase and gain diferences between two input signals. I can't remember the maximum frequency, but browse Analog to see if it can help you
Bye
Added after...
Hi Artem,
any paper explaining autocorrelation methods to calculate frequency
I remember using autocorrelation methods with pulsed signals, but i can't remember if it was to calculate frequency
thanks
DAVID
Hi echo47,
I supoose i could calculate the ripple and frequency of the mixer output in order to be able to know that th accuracy is better than 10 khz. Although i still don't know how to do it, is it suposed to be so difficult??i've never done something like a frequency counter in 1 GHz...
Hi all again,
what do you think about the next idea:
What i am thinking is to make the DDs to sweep its frecuency in order to mix it with the fix frecuency I have to measure.In theory, when both frequncies are pretty the same, I will obtain from the mixer something near a DC voltage, when this...
I cann't use an external meter, i have to develop a little module to be integrated into a bigger system.
So I was thinking in mixing or mix down and digitalize in order to use fft , but i haven't seen in the web any aplication or paper or somethinbg similar
thanks again
DAVID
phase matrix/eip 585c
Hi all,
I have to measure frecuency inside a 1Ghz pulsed signal, about 500ns wide. I think it is too narrow to try a traditional PLL, but maybe mixing with a DDS until i obtain a continious DC level (ripple should be specified depending on resolution:10Khz) and then...
It all depends on what kind of modulating technique you are using
The relation between carrier and modulating signal will fix the modulating index, which tell you in any case your bandwith
I suppose 1o times the modulating signal is required in order no to colour the modulation spectrum
i...
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