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Recent content by cciarleg

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    Altium Unroute Does Nothing

    I've tried a few things: Tools->Unroute-> All does nothing (doesn't even think about it). This is really the one I need to work-want to do a version of a previous PCB. Tools->Unroute-> Net does nothing. Lets me click on a route (even offers a choice if multiple nets under the click) but...
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    Flybuck Design Secondary Voltage not correct

    Is there any way to get that kind of power out of the secondary? The LT3690 I like because I can place an input at the SS pin and have control over the output. Are there any other methods or architectures that will accomplish the same thing? The only other thought was to have a 28V isolated...
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    Flybuck Design Secondary Voltage not correct

    Hi, I'm trying to design an isolated flybuck similar to the example design shown in AN-2292 by TI. My simulation is not turning out with the secondary voltage correctly though. My design criteria: Need isolated 40W (currently set to 11.5V, 3.5A). Ideally I need a controllable signal also...
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    Connector Recommendation

    Correct me if I am wrong-these look like semi-permanent connector types. Either crimp or IDC type. I like the screw terminals because they are easy in/out-no damage to either part. Unfortunately, I don't think these will quite work due to the nature of getting the wire out and the potential...
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    Connector Recommendation

    Hi, I'm looking to see what folks typically use for space where I need high density connectors but it is a relatively prototype board, so I want to be able to change the wires. (I have a bunch of PRT/RTD/digital temp sensor connections on a very small board) I am trying to find a very small...
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    [SOLVED] Altium Flex does not bend in 3D

    Hi, I have a set of boards I wanted to try and do a flex between. The boards are 3.7" and the flex is 3.2" wide, 4 layers between them (rigid boards are arbitrarily set at 14 layers right now). Flex section is checked off as flex in layer stackup. I put a bending line in-but it won't change...
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    Altium Pin Swap Errors

    Hi, I'm having some trouble with pin swap on a virtex 5 part. There are 2 issues: 1. Some pins do not move at all (despite the fact that swap is enabled) 2. After the swap, when I go to update schematics-272 pins fail with no reason. (When I validate changes I get the little red x with no...
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    [SOLVED] Altium: Missing Negative Net

    I have solved the issue. Just to be clear: I had differential directives on all the lines. All the lines I could find (including AMP_N and AMP_P) were labeled with a XXX_N or XXX_P net label. Thus the confusion over why the errors were occurring and how to find the nets I apparently missed...
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    [SOLVED] Altium: Missing Negative Net

    I am getting 3 errors that I cannot locate in my design: 2 look like: Missing Negative Net for differential Pair [N00674], positive net [N00674] How do I even find where that is? One looks like the above, but has a name ,[AMP] and [AMP_P], but I cannot find any breaks or offwire labels or...
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    Altium-Duplcate Net Names on PowerPort

    Hi, I have a hierarchical style design-which means power ports are global. I'm getting the duplicate net names on one of my power ports (not all of them-just the one). And I'm not sure why? Its a custom port-but so are my other ports. What would make a port throw this error? Thanks.
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    Understanding how to use AD835 Multiplier

    I am trying to use the AD835 multiplier and I do not understand how it works. I want to get a signal out that is +/-2V out of W. I have a differential signal going into Y1/Y2 that is +/-1V per line (2V total diff) I need to know the size of the signal to put into X1/X2 and what resistors to...
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    Altium Repeated Buses

    Hi, I'm getting a "duplicate net names bus slice" error. I would like to use a sheet symbol multiple times, something like the attached. It is, essentially, a repeat (which Altium recognizes and creates the correct channel repeats). How can I name these buses (there are 6 sheet symbols like...
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    Basics of an R2R and OpAmp

    Hi, I really need someone to walk me through this step by step. I'm just not getting it. I understand the principle of the scaled resistors into an opamp-the very basics of the inside of a simplistic DAC. I have simulated an example R2R and see that it works. I don't understand why...
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    DAC with built in Feedback resistor and PGA

    Thanks for the reply. I've seen the equations in regards to this DAC and some others I've looked at. So that means, because this is a PGA, that there is inherent digital gain correction so no R2 needed. On the other hand, how do you tell if digital gain correction is provided (or enough is...
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    DAC with built in Feedback resistor and PGA

    Hi, I have a DAC with a built in feedback resistor (the AD7538) and I would like to make a PGA with it (and an op-amp of course). (unipolar-although I would be curious if you could do this with a bipolar output as well) It is a current output DAC. I'm still learning a lot of this so I have...
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