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  1. K

    power consumption in 2-bit multiplexer

    Are you trying to calculate the power consumption of a physical circuit or is this more of a theoretical practice? The inputs are all high impedance so I don't see why the input settings would affect the overall power consumption. The circuit/IC should have some supply current and the power...
  2. K

    True Plug & Play Wireless Adapter

    Hey all, I'm working on a product that currently communicates over a wired Ethernet connection with the host PC. Eventually we want everything to be wireless so we designed in a standard IoT WiFi module but getting the firmware support up and running has turned out to be a much larger task...
  3. K

    Voltage reference that can sink upwards of 100mA

    Ah I misunderstood you, I though you were offering those amplifiers as a replacement for my driver not for the "mid scale regulator". Thank you for the suggestion, I'll take a look at this as a possible solution. -Kevin
  4. K

    Voltage reference that can sink upwards of 100mA

    I guess my issue isn't biasing the output of my driver its where I'm driving current into. The "50 Ohm Resistor" in my circuit is actually the offset cancellation strap of a Magnetoresistive element. At the worst case scenario I need to drive it with a 50mA peak sine wave at approximately...
  5. K

    Voltage reference that can sink upwards of 100mA

    Hey all, I have 7 analog channels each of which is going to be driving a 50mA peak signal through a load. The problem is I was planning on using a single ended supply to avoid an extra dual rail power supply. So the driver is powered by a 5V single supply and will be centered around the...
  6. K

    Designing around ADC Noise

    Yes I am in control of the electrical source, the sensor has a drive coil which is driven from another PCB in the stack. The DAC that generates the drive signal is clocked by the same buffered clock as the ADC, not sure if that makes them correlated in any way. How would one go about forcing a...
  7. K

    Designing around ADC Noise

    That is correct, no DC needed. The though of signal transformers had crossed my mind but this open a whole new can of worms where I'm increasing the noise coupled in from the signal driving the sense coil. Not saying its impossible but I just haven't gotten to that yet. I was also worried...
  8. K

    Designing around ADC Noise

    I made this confusing by interchanging units but in the same units the noise is actually 100mVrms out of a 707mVrms full scale input, even worse. However if you take the SNR as the ratio of the power of the signal to the power of the noise its about 34dB, still not good for an ADC thats capable...
  9. K

    Designing around ADC Noise

    This is a bit of a long question so thanks in advance for any insight! I'm working with an inductive sensor that will under some conditions that I need to measure be giving me as little 200uVpp response. The sensor can operate to upwards of 20MHz so the cutoff frequency for any filters in my...
  10. K

    How close can Op Amp operate to open loop gain

    I'm going to test it when I have the opportunity to but personally I'm more interested in learning about the theory behind what I'm trying to do. So far I've been unable to track down the answers I'm looking for elsewhere and usually have good luck here. But thanks for the non snarky part of...
  11. K

    How close can Op Amp operate to open loop gain

    Previously I've been using a DAC and a summing junction to cancel the offset, as long as that is introduced before this gain stage I don't think the increased gain will cause any issues. Certainly less than 100kHz, I say relatively since currently I'm operating around 20MHz. The application...
  12. K

    How close can Op Amp operate to open loop gain

    If I needed a to gain up an really small signal, say 100uV peak, up to 1V peak. I'll need a gain of 10,000 to accomplish this. Could I practically push all of this gain onto one stage, using an op-amp like the LTC6406? It has an open loop gain of 90dB and I'm only looking for a gain of 80dB. I...
  13. K

    Why would touching a DC/DC converter stabilize it?

    Re: Why would touching a DC/DC converter stabilize it The input voltage is 15V and this problem occurs both with no load and a 1A load. Is burst mode associated with DCM operation? The chip defaults to CCM operation only and I've verified that by checking the registers. Is this the input...
  14. K

    Why would touching a DC/DC converter stabilize it?

    Why would touching a DC/DC converter stabilize it Hey all, I'm seeing a weird phenomena with a DC/DC converter I'm using, specifically a quad TPS65400. It has four buck converters in one package, three of which are operating perfectly on multiple boards, the same three 1.2V 1.8V and 3.3V...
  15. K

    PI filter for industrial controller board

    Is the power supply a switching DC/DC converter? Are you trying to suppress the switching noise or some source of radiated EMI? Essentially we need to know what frequencies you want to reject before selecting an inductor value. Also make sure to keep the voltage rating of the caps and the DCR...
  16. K

    [SOLVED] bridging two sides of the same PCB

    Did you also make the driver PCB? Usually when designing a stack of boards like I believe you're describing you use something like a mezzanine connector. Male on one board female on the other. If you don't have any control over the driver PCB do you have space for right angle headers? Edit...
  17. K

    Why would dynamic current consumption increase with frequency?

    That makes a lot of sense actually, I was wondering why my quiescent current seemed to stay stable until the MHz range where it really started to add up. Thanks for all the input!
  18. K

    Why would dynamic current consumption increase with frequency?

    I was thinking about capacitors since I also have an RC filter right at the input to the ADC but shouldn't the average current through the capacitors be zero since they store and then release energy rather than dissipating it as heat like a resistor? I'm measuring current draw from my supply...
  19. K

    Why would dynamic current consumption increase with frequency?

    So I have an analog path of a few stages of op amps. I tested it over a wide range of frequencies (100kHz-20MHz) and got more or less the results I expected in terms of gain, bandwidth, noise, and quiescent current. However I noticed that once I reach 5MHz or so the current from my supplies is...
  20. K

    [SOLVED] dual circuit series parallel RLC

    @BradtheRad A little off topic but what circuit sim program are you using there?

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