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Recent content by DanTheMan

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    Phase detection in microwave radio

    What about in the case where the PLL/VCO components on each of the Transmit/Receive are used only to drive the LO? This should be equivalent, correct? I.e. if we have a source at 100 MHz that gets up-converted (in the transmit) and downconverted (in the receive) to 3.65 GHz (and 3.65 GHz is...
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    Phase detection in microwave radio

    Each of the transmitter and receiver have a VCO+PLL for up- and down-conversion to IF, respectively...in this case we're able to synchronize them with a common clock. The distances discussed here are in the range of 1 - 5 m. We're not trying to get absolute phase measurement, but rather a...
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    Pogo pin test board design

    I'm trying to design a motherboard test board based on a 62 mil FR4 PCB. The device to be tested is a BGA-type PCB which is 40 mil FR4 and which has BGA balls on a non-standard pitch of 2 mm. Since the pitch of 2 mm is non-standard I cannot seem to find a socket that will accommodate test pins...
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    Phase detection in microwave radio

    I have a microwave radio link where the transmitter and receiver are linked together by a common clock. The transmitter upconverts a baseband low-frequency i/q signal to a higher frequency and this is sent out to the receiver which down-converts it to the same i/q frequency. With the...
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    90-degree 2-way splitter or hybrid -- low frequency?

    Very nice -- now if only they had this connectorized ;-) ---------- Post added at 22:54 ---------- Previous post was at 22:36 ---------- Answered my own question -- turns out you can buy the surface mount component and the evaluation board straight from them.... Thanks!
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    90-degree 2-way splitter or hybrid -- low frequency?

    Thanks everybody who responded -- currently I gave up on finding a 90-degree splitter at < 1 MHz; if there were any they either had very bad phase or amplitude unbalance. I've moved the reference level to 10 MHz -- can somebody recommend a 90-degree splitter at this frequency? The reason that...
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    90-degree 2-way splitter or hybrid -- low frequency?

    I did -- they don't go that low... However, I noticed the HL-series from MCLI: 90 degree hybrid - 10 bandwidth - lumped element may cover as low as close to DC. Note that I am aware that I cannot get these @ DC :-)
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    90-degree 2-way splitter or hybrid -- low frequency?

    Hi, can somebody recommend a 90-degree 2-way splitter which is connectorized and which works down close to DC? I've been looking for manufacturers and I can't seem to find anything that goes below 1 MHz? I'd like to be able to use a 90-degree at around 10 kHz ... Any thoughts on how I may be...
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    Differential arbitrary waveform generator

    Interesting, note that since I need a fixed sinusoidal output frequency (in differential quadrature mode), I'm thinking of using the following design: A MAX4454-based I/Q generator tests RF quadrature modulators - Maxim Can you guys recommend me a fixed input (say 10 kHz) sinusoidal chip or...
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    Low cost digitizer -- sound card? 2 channel possible?

    Hello, Would it be possible to use a sound card as a low-cost digitizer platform? Would Labview be able to work with this? I realize that the frequency for sound cards is limited, usually around (less than) 192 kHz so the max input rate should be around half of that or less (Nyquist)...
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    Differential arbitrary waveform generator

    Hello, I need to find a low-cost differential arb waveform generator (also known as awg, etc.)...modulation frequency does not need to be high but ideally it should be in the form of a PCI-based card (if possible). Any thoughts on what may work to accomplish this? I looked at products by...
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    How does 10 MHz (or other freq.) reference work for phase lock

    Can somebody explain or point me to a good reference which shows how a reference signal/clock/etc. works in order to phase lock a number of different instruments together? For example this would come up when connecting the output reference 10 MHz of a signal generator to the input reference 10...
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    Amplification and DC offset circuit?

    Assume a single power supply if possible, +15V. Thanks!
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    Amplification and DC offset circuit?

    For now let's say that it would be a manual adjustment -- using some on-board potentiometers for example. Also in the first pass, longer term drift/stability/etc. are not important; this is merely because the output of this circuit goes into a DAC and I'd like to use the full range of the DAC...
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    Amplification and DC offset circuit?

    So I have a circuit that outputs a voltage between 4 and 7 V at a constant current...this output should go into a circuit that expects a 0 to 15 V input level. I don't know ahead of time what the output between 40 and 70 will be, the low limit may be 4.5 or 5.0 V and the high limit may be 7.5...

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