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There are many reasons why they can be different:
1) You're operating at a frequency roll-off point at the fundamental frequency
2) Your 2*RF frequency re-mix product is a significant contributor to the IP3 AND it's at a high frequency roll-off point
3) Your "delta" frequency re-mix product is a...
Analog devices offers 8302: A Gain and Phase detector.
I want to do basically what they do, but, I don't want the Gain detector to be logorithmic, I want it linear.
Are there any other parts out there that I could the same thing with? Is there a separate chip for phase detection? My input...
The limitted improvement in IMD is probably because the amplifier already implements some form on IM3 cancellation. You really should be looking at ACP3 using a modulated signal. Seeing 3dB improvement on an already cancelled IM3 is probably expected. Once you look at the ACP3, you should be...
The MAX2009 is open-loop correction, which means you can expect it to make distortion worse before tuning, but better after tuning. This is because the distortion has to be tuned to match your amplifier. If it is not tuned, than it won't match it and instead of cancelling it, it will only add to...
While 2 Tone testing can be helpful, you probably want a pseudo-random signal generator.
The problem is that most LDMOS these days include built-in open-loop IM3 nulling, and your two-tone test may show very good results even without the pre-distortier. Once you send a modulated signal, the...
That all depends what you are trying to do...
Are you running it closed-loop or open-loop?
What kind of device are you trying to compensate? Is it a big base-station like LDMOS, or something smaller?
Finally, is the modulation scheme only phase-modulation or does it include amplitude modulation...
I have a digital, synthesized circuit that is embeded in an analog IC.
I wanted to compare which method was faster:
1) Spectre - replacing all MOS devices with ideal switches and capacitors
2) Turbo - replacing all MOS devices with ideal switches and capacitors
3) Turbo - Using real MOS...
With the new Cadence token system, an individual now can use almost any of Cadence's advanced features as long as there are free tokens. It also means a user can easily suck up many tokens and leave everyone else waiting...
Is there a way add priority levels to the tokens, such that a...
Microwaver,
We need more information in order to be able to help you. Here's what ideally I'd like to see in order to make any judgement:
-Circuit Schematic with Voltages/Currents annotated
-Block-by block breakdown:
1) What is the NF, Gain of a single gilbert cell?
2)...
ne4210
cmosbjt,
When creating a 20dBm IP3, you will need to generate an P1dB of 10dBm. This is a large power and will require a large device, which means the input impedance into the device on the LO and RF side will be low. This will require to have a large matching network and will force the...
Re: Powering LEDs
I believe that one is QFN. If you can't use QFN, then are alternative parts both from Allegro and other companies (such as Linear, Maxim, etc...).
If I go to www.allegromicro.com, I notice that the A8501 is out as a TSSOP, but that parts has only 4 strings and is intended...
Re: Powering LEDs
Firstly, you mention 750 LED's, but 10 Arrays of 15 is only 150 LEDs. So the question is, is it 150 LED's or 750 LED's?
If it's 150 LED's, then the next question is how much current?
If you are using 20-30mA of current, then parts like the Allegro A8500/A8504 may be used...
The Wilson Current mirror doesn't provide much advantage when using MOS. It's biggest strength is eliminating base current error when using BJT's.
However, here's how it functions in your configuration:
Assuming initially all devices are off, the following sequence of events will happen...
THD
Sankudey has a point,
Distortion is a non-linear effect usually caused by amplifiers, mixers, etc... THD power should increase faster then the input signal, so if the input signal is increased by 1dB, then THD power should increase by more then that.
Now an A/D's sampled signal has...
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