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Recent content by jsherman

  1. J

    RF capacitors with high Q/low ESR don't list ESR above 2 GHz

    I haven't worked in the X-band myself, but instead of trying to extract some unmeasured parameters, I think your solution is to use a better capacitor. ATCeramics has a set of ultra broadband caps that will fit your job, claiming an SRF of 40+ GHz and a capacitance in the nF range, great for a...
  2. J

    Why is an unloaded buffer showing an offset ?

    Can you post a schematic? Looking at the datasheet, you have an input offset voltage of 7 mV max. You also have an input bias current of up to 3.2 microamps (!). These could certainly cause an offset at the output of the buffer!
  3. J

    [SOLVED] Importing LT's .asc Files to Allegro PCB

    I have found a solution to this problem. It's a bit of a pain, but doable. It seems like the padstacks are named within the .dra file, of which the .brd file contains one instance. So to get anything useful done, you actually need to change the .dra file, not anything in the .brd file. Here's...
  4. J

    [SOLVED] Importing LT's .asc Files to Allegro PCB

    I'm attempting to import LT's provided library of .asc files into an Allegro library using a SKILL script. Currently, the plan is to automate a process that imports the .asc using the the "pads in" command to convert it into a .brd file. Then I can extract the .dra, .psm, and .pad files from...
  5. J

    Arduino can be used for variable duty cycle square wave?

    A rough search on my end seems to indicate "not quite," but it will depend on the speed of your Arduino. Functionality-wise, Arduinos have a number of DAC inputs for the pot, each with 10 bit resolution if I recall. If your timer interrupt is fast enough, you can get 1024 duty cycles. There are...
  6. J

    Motivation behind Single Stage Amplifiers

    Context: I'll be teaching a second year EE class that covers circuit analysis including the basics of transistor amplifiers. When I took these courses, I remember I couldn't keep any of the configurations in my head without resorting to memorization in the beginning. I really didn't know why a...
  7. J

    SAR ADC with serial output

    Hi Cheng, I'm not sure why you would want to serially output the output of the ADC, but if you really wanted to, why don't you just output the comparator's result as your serial output every clock? Really, though, I feel SAR ADC's should have a parallel output. In 10 clocks you'll have the...
  8. J

    [SOLVED] Power Levels At Different Frequencies

    Fvm: Given what you mentioned about signs, you seem to be referring to instantaneous power, and might be more appropriately written as P=V(t)2/R. In which case, it might be helpful consider to Vrms for a standard period signal for the time-average power. I feel Ptime-average = Vrms2/R seems...
  9. J

    GALS and PALS codiing

    Oh man, this looks a lot like ABEL. It's a logic hardware description language for very low level logic, at the level of AND and OR gates. It was eventually replaced by other HDL's like Verilog and VHDL, if I recall. The "!" means not. So PIN 2 = !CIPL0 ; means that Pin2 will output whatever...
  10. J

    temperature vs frequency plot in cadence

    What exactly are you trying to measure? A temperature vs. frequency plot sounds like you want the temperature of your circuit vs. the input frequency, which I don't think is possible in Cadence. You can get Frequency vs. Temperature, though. Temperature in Cadence is the temperature around the...
  11. J

    [SOLVED] Power Levels At Different Frequencies

    Are you generating the signal? If you're generating the signal, it probably will cost more power to make a 10 GHz 10Vpp signal. If you're putting this signal into a system, it depends on the system, as goldsmith said. In CMOS technology, power is split into two categories: dynamic and static...
  12. J

    Battery Powered Supply

    Hi Halls, That sounds like exactly what I would want! However, I'm having a little trouble finding an IC that does that. I've been searching around for battery supervisors, but I've only found battery monitors and battery chargers. Are you referring to the battery charging circuits that supply...
  13. J

    Battery Powered Supply

    Hi halls, I initially was going to use an LDO, actually! I agree, it is a very easy solution and solves my issue of the draining supply voltage from the battery. That said, LDOs are pretty wasteful on power, aren't they? A 9V supply dropping down to 5V at an average of 500mA wastes 2W, doesn't...
  14. J

    Battery Powered Supply

    Hello to everyone, I'm planning a microprocessor project that requires 5V at approximately 1A (in the worst case, when the motor and GPS are on, more like maybe a few hundred mA in general, non-worst case). Maybe that's a bit misleading, then; it should be able to tolerate spikes of about 1A...
  15. J

    Data converter terminology

    Yes, if the ADC spec is 10-bit 500MSPS, it will generate 500*1e6 10 bit words per second. As for replacing MSPS with Hz, that's a little different. Let's take a look at an example 10 bit, 500MS/s ADC on digikey: https://www.intersil.com/content/dam/Intersil/documents/fn76/fn7606.pdf Scroll down...

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