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I am trying to solve the same problem.
You can get the bandwidth by making a coil and deQ the coil with a resistor.
Lamda of RFID UHF is 33cm (13inches). That means it is very difficult to make a large magnetic antenna.
Maybe an array of small antennas?
Re: RFID reader Amplifier
Hello,
The most efficient amplifier for 13.56 MHz is a Class E amplifier.
I think you only need to transmit ASK.
For example you can use the IRF510/IRL510 transistor for that and easily get up to and more than 20W at 13.56 MHz.
There are many reference designs for...
Re: Why IP3 of LNA?
Any received large signal (blocker) next to your band of interest might create nonlinearities in your band through nonlinearities in the LNA.
Or if your received signal in band is very strong you don't want it to distort. That's why you need high IP3.
Likewise to detect a...
gobind daryanani solution manual
Here is a very nice online tool to design OpAmp filters:
You just use the OpAmp in a BiQuad configuration.
h**p://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/filter/filter.html
Re: phase shift
Basically you can use a 90-degree hybrid or L/C elements and replace the capacitors with varactor diodes. That should work fine for shortwave frequencies.
Here are some links you can find on any search engine for "90 degree hybrid phase shifter":
Phase Shifter Design Tutorial...
Re: CST port
It might have to do with how close you are the open boundary and how close your waveguide is to the antenna.
Try changing the port size and the surrounding boundaries.
What may help is to add air at each open-boundary and extending the microstrip port a little away from the antenna.
Why would you want to filter at RF-Band? Are you planning to make a preselection filter with CMOS?
Or is it Image-Rejection? Then I would use an image rejection mixer.
You can filter at baseband with continous-time active filter or switched capacitor filter.
Re: ADS nodes/markers
Actually you can export the circuit usig the export function.
I think it is called export as IFF.
I exported a simulation file from 2003 A and then imported it with 2002. It has been while ago so I don't remember exactly which options (include libraries etc.) at the...
how to test an op amp
You could hook the 741 up as a noniverting buffer (connect the output of 741 with the inverting input).
Then you could test if a digital signal feeds through one to one.
But this tells you only if the 741 is totally "dead'.
To verify specifications you will need various...
Re: Question on DAC
SFDR is often specified for direct digital synthesis.
You generate a sine-signal with the DAC at a sampling rate higher than the signal you generate.
So, the generated sine-signal is for example 10MHz. So, your sampling-rate can be let's say 100MSPS (>2*10MHz: Nyquist)
SFDR...
Thanks multinova51,
This is exactly my problem. The new preliminary ETSI spec says that you need to listen before talk. You can only transmit after channel is free (nothing above -96dBm).
Doesn't a Cordless Phone in the same room or floor just swamp everything above -96dBm? It seems as if after...
Re: microstrip antena
Actually there are easy-to-make microstrip antennas with bandwidths up to 30%-40%. For example cut in a U-Slot.
You are right, a standard patch has less than 2% bandwidth.
You want to use a small epsilon-r as possible to keep the radiation efficiency up. You especially...
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