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Recent content by circuit_hunter

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    RF power Amplifier FET transistor

    How did you design the power amplifier if you didn't simulate it already to see the PAE,Pout etc? May be you did it using ideal closed-from equations. But anyways, this is how I do find these parameters: Since, measuring these many parameters means writing loads of equations, I use design guide...
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    Parallel coupled line Band pass filter

    Mabrok, To begin with, read filter fundamentals from Textbook such as Microwave Engineering by Pozar. You will see how the S-parameters of filters look like. Also, if your project is an academic one, use a cheap FR4 material for your first design. Later, you may go through more thorough book...
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    So, what exactly is a power source (P1Tone) ?

    Thank you, FvM for the clarification: The P1Tone injects specified power to the conjugately matched load. The reason I am asking this question is that in low-frequency analog I used to have voltage and current sources. It was much easier to visualize current and voltage waveforms in different...
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    So, what exactly is a power source (P1Tone) ?

    Hi I got confused about this small concept. A voltage or a current source make sense to me. An ideal voltage source maintains a constant voltage across itself, irrespective of the load attached to it. Current, in such ideal volatge source, could be anything, depending upon the external...
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    voltage controlled model selection in Keysight ADS

    Hi I have to use two distinct models depending upon the node voltage, something as follows: The diodes D1 and D2 have different properties/models. If the voltage at node v1>0, then I want node v1 to be connected (perfectly shorted) to the D1 (as if D2 is not there at all), otherwise to D2...
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    coupled line couplers

    Hi Shruthi I haven't used AWR, but for single band couplers you just google and you will get plenty of links. For example, https://www.youtube.com/watch?v=otMqqsF-KuY https://www.microwaves101.com/encyclopedias/coupled-line-coupler once, you know how to make simple couplers in AWR, the next...
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    3-lead Transistor for high frequency?

    Am I right, if In infer from your reply that the two source pins are internally connected? Just like many ground vias in PCB, they are effectively in parallel? I thought of doing that, but if I later decide to really use this transistor, I was wondering about its possible layout in ADS...
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    3-lead Transistor for high frequency?

    Hi I want to test some ideas, where I would like to feed an RF signal into the source terminal of transistor (the way we do it in common gate configuration). And, my frequency is not very specific, but say in the range of 1GHz-2GHz. I thought of using ATF-34143, but it is 4-lead pHEMT where two...
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    Thanks, again. And sorry for delayed reply I got busy in some write up. This an academic project, so may be this will be standalone circuit. Or may be, later, I can use it with antenna and some storage element. But, in any case I will more port calibration type and compare that with the...
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    I was about to give up on this as many of my design used to fail coming at last stage. So, thanks a so much, John. Thank you for your precious time. I have couple of more questions: (1) Do you suggest whenever I use active device, I should do momentum from 0 Hz? (2) Why do I get warning about...
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    Thanks for your efforts, I appreciate the simulations results. I have sent you the files privately.
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    Thank you so much for your time, John. All the ports in Part B are TML , except the input (point 2) which is TML (zero length). But, I think internal ports are also changed to TML zero length as line extension required in TML will intersect other lines. In anycase, port calibration shouldn't...
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    operation of an NMOS circuit

    Hi I am trying to understand an NMOS circuit whose ID-VDS characteristics as found using default NMOS model in LTspice is as follows: I know that a mosfet has a transconductive behavior- vgs produces ids and that with external circuit sets the vds; ignoring channel length modulation. But...
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    @BigBoss: I checked the matching network by terminating it with the impedance of PART B, which I had obtained using LSSP/HB simulation, and it works fine. But, you might have a point: The input impedance was calculated with power injected at the input of PART B. But, when I include the matching...
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    [SOLVED] Strange EM cosimulation, Keysight ADS

    Thanks for the quick response. The dimensions of PART A is 2200mil*1400mils and that of the PART B is 800mils*300mils. The design frequency is 900MHz. I used HB/LSSP to find the input impedance of PART B and invoke my analytically derived equations to design the matching network. I observe the...
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