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I have a problem using a v/uhf 100 Watt design from POLYFET. I have realized exactly the suggested TB167 design but the LB501 transistor breaks down without any specific reason.
The output load is 50 ohm and there is no input overdrive at all. Sometimes immediately after turning on the power...
2.45 ghz
You can use a transistor from Polyfet. In application notes, you will find the full pcb design and bill of material, therefore you would not need a specific model to simulate it first.
Re: RF Power detectors
Based on the frequency range, dynamic range and a number of other factors, you may found various part numbers. search the rf companies such as hittite, minicircuits, ... to find what matches your need.
Re: PLL&Oscillator
There is one important point here that should not be forgotten : VCO by itself, oscillates as soon as a voltage is applied to the Vtune pin of it, but in such ocasion it is free running, means it does not lock on a certain frequency.
The second point is that the voltage it...
Since the devices are now reduced in size, all the fields which result in smaller dimentions are considered hot. For example, in wireless technology, it is a large attempt to decrease the power needed for a device to the lowest degree. There are also other areas for example the conversion from...
In practice, when the S parameters of the circuit does not satisfy the requirements, or in other words, the amplifier is not matched, it begins oscillation.
In order to avoid oscillation, the return signal should be attenuated at the output port of the amplifier. Therefore, you can use a 2-3 dB...
I would like to learn some thing about mixed analog-digital systems. If any book exist in this area, could you please let me know?
I think in the future, rf circuits will be substitued by mixed signal boards and this is why many research centers around the world are working on this issue. If you...
I have an idea that you use ADLSim which is a free software on Analog Devices web site. It gvies you a full simulation of the loop. It can be used only if you have a synthesizer from Analog Devices such as ADF series. If so, you can try different loop bandwith with various loop filter structures.
I need some information about the structure of Radar Power Amplifiers. Imagine that a 4 KW power amplifier is supposed to be implemented. How it should be down ? One way is that you splitt the main signal to 8 ways, then amplify each way with a power transistor such as SR401 and then combine...
Hello
If any one has information about Built-in Self Test (BIST), specially when it comes about RF circuits such as upconverter or tunner, please let me know. I am supposed to begin a research about it and finally deploy it in one system.
Re: phd suggestion
In today's RF and Microwave technology, designing passive and active filters is a good choice for both study and job. As an example. you can work on an active filter design for microwave frequencies. I have a friend in Arizona university who is now working on it.
I dont need an oscilator. What I need is a "comb generator". It is a device such as an SRD diode which gets a signal in its input and then generates all the harmonies if that. I know how to make a comb generator but I need a non-linear model of that in order to improve my simulations.
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