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    Processes & Threads

    I've been pretty AWOL from this site but need to reconnect with the wealth of folks willing to help. From what I understand a process is made up of a single or multiple threads, correct? Can multiple threads run concurrently or are they all scheduled at a fast enough rate so as to seems like...
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    Need Embedded System Design Help

    I'm a newbie to embedded system design and need some help understanding how certain concepts affect the overall system design. I'm in learning mode as pat of this team so I'mnot expert. So expect stupid questions. :) I'm not here to have people tell me how to do a design since that is the job of...
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    Should I take into consideration LNA stability factor?

    I am using an Avago LNA that according to the datasheet is unconditionally stable. See link: Ultra Low Noise, High Linearity Active Bias Low Noise Amplifier I have a test board and populated the components for low NF. If I am only interested in a specific band and the stability factor states...
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    Quick Help: 50 Ohm Termination

    Hi, I have a pulse generator that only does 50 ohm out and a switch circuit that has an high impedance input. I see that this is a problem but would like to know how to have a quick fix. Is it possible just to have a 50 ohm resistor to ground at the input? If not then what do I do? Thanks!
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    Distribution Transformer (Pole Mounted) Wiring

    I have a question regarding distribution transformer mounted on a pole (neighborhood), how are more than one house wired to a distribution transformer on the pole? Are they all connected to the 3 wire terminals? Some details on this would be great. Links are welcome.
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    Frequency Scaling parts from 900MHz down to 300MHz

    Hi Everyone, I am looking into using this Avago LNA and they show an application note for 900MHz (see link) where they show the component values. **broken link removed** How can I use the exact same design at 300MHz? I don't know how to do it but I image that I have to do some sort of...
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    Pulse Generator Source Impedance

    I plan to use an Agilent 81111A Pulse Generator (with complementary outputs) to provide the control to my drive circuit for my SPDT switch. The SPDT switch can be found here: https://www.triquint.com/prodserv/mor...rod_id=TGS2306 Pulse Generator here...
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    Calculate Off Capacitance & On Resistance from S-Parameters

    Hi, Is it possible to get these characteristics of a RF Switch if you have the 2-port s-parameters when the switch is open and closed? If so, can someone provide the equations or link me to them? Thanks.
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    LNA Stability due to Wide Impedance Differences

    So I had a narrowband antenna, Q approx equal to 20 and my frequency is 300 MHz. My impedance at 300MHz is 60.95 - j45.75. BUT, my impedance changes significantly when I move off 300MHz. My issue is that the LNA will see high kOhms when I open a switch on the antenna (receive antenna). What...
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    Narrowband Matching Network to Broadband Network

    Narrowband Matching Network to Broadband Matching Network I had a source that has a 60.95-j45.75 impedance. Through the help of some on this forum I got a matching network that provided great matching to 50 Ohm at 300 MHz. The thing is that I need broadband matching as oppose to the...
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    [SOLVED] Help with Impedance Matching

    Thanks for the help.
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    Solutions for Switching FETs

    Hi, From what I understand one needs to block AC signals when using DC to switch FETs. Again, from what I understand some inductors are using in series with the driver circuit for a FET switch. Doesn't this slow your switching speed down? If it does what are some creative solutions to...
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    Help Identifying Filter & Governing Equations

    I'm currently trying to make a few line traps and have been doing a little reading. I found that these guys used a T filter with some lumped element components. They didn't describe how they did it so I'm a little confused. I am trying to block a range of frequencies. They blocked 1 MHz to 10...
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    Need Help with the Current Loop - GND Reference Issue

    Thanks for the help.
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    A little help breaking down circuit diagram

    So I wanted to just get a better understand on what I am looking it with this application note. My question is, where is this 4-20 mA current coming from in this circuit. I know the current (they tell me if you click that link) that flows through R3 causes a voltage drop across R3 and this...
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    Where is the 1dB Compression Occuring?

    1db compression If you look at the data below I put an input signal in and record the output and then calculate the change. So I basically expect to see a change in 1 dB if I change the input by 1 dB. At which point would the 1dB compression point be? At -19 dBm? I'm not sure what the margin...
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    VCSEL Driver/TIA Rx Ckt Help

    vcsel driver Hi Everyone, I would like to put together a VCSEL Driver that can accept LVDS signaling. The VCSEL is a 850 nm with a bias condition of -1.6 V. I looked at a few companies that provide this: Vitesse, GigOptix, Maxium, etc. Since I am fairly new to all of this I would like to...
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    Issues with SWR/Return Loss of Splitter in FDM System

    splitter return loss So let me describe by setup: Coax Line carrying 8 signals in the range of 0.8 GHz to 2.2 GHz. Each spaced by 200 MHz. This coax goes into a 1-to-8 Splitter. On the output (8 outputs) of the splitter there are 8 BPFs. Each filter has a different center frequency of it's...
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    Poor SWR @ Input of FDM Rx System ------ Help!

    poor swr Everyone, I am having a few issues with the Rx side of the FDM system. Configuration: Input --------- Combined Channels -----------> 1-to-8 Divider ------> Filter (each output) ---------> Amplifier (each output) ----------> Mixer -------> Filter (Each output) ------>...
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    Help with Understanding Antennas in E & B Fields

    Note: I don't know much about antennas. What I want to know is is there a small antenna that can pick up a 1000 V/m E-filed and about 30 Tesla. Since I do not know anything about antenna design I would like to know does any particular antenna would be best suited for something like this? i.e...

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