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Type: Posts; User: faisal78

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  1. Closed: CDMA (cellular?) vs CDMA Trunking. LTE vs LTE Trunking

    Hello
    I would like to seek some help from the various experts here.
    As you all maybe aware, CDMA and LTE are cellular technologies.
    I have come across a variant of these which is a "trunking"...
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    Closed: LTE FDD Resource block (RB) allocation

    Hi

    LTE FDD will require two frequency spectrum allocation, one for UL (uplink) and another for DL(downlink) separated by a few tenths of MHz.

    Does RB allocation by eNODEb have to be symmetric? ...
  3. Closed: EMMC5.0 HS400 Memory controller phase tuning

    Hi
    I am interested to know the details and technicalities of a automated memory controller phase tuning. As the EMMC/DDR memory gains in speed, the timing constraints and Signal Integrity become...
  4. Closed: I2S Frame Sync to 2-slot TDM short pulse Frame sync

    Hi
    I have a MCU with multiple audio peripheral interconnects that is interfaced via I2S.
    The MCU is the I2S Master generating the FS and CLK signals to all peripherals.

    Now i would like to add...
  5. Closed: Recommendation of Digital Logic Simulation tool - I2S Generator

    Hi EDA forumers,
    I am trying to do some digital logic based simulation to add some flip flips, and digital logic to a I2S waveform source.
    I would need a synchronised Frame Sync (FS), Bitclock...
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    Closed: Re: Charlieplexing & LED leakage

    Hmmm, is there really no solution to Charlieplexing a RGB LED from a single power source?
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    Closed: Re: Charlieplexing & LED leakage

    Hello, another great example of the possible leakage issue can also be seen in the below application, which I have taken from
    http://fritzing.org/projects/charlieplex-snowfallshooting-star-20-leds
    ...
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    Closed: Charlieplexing & LED leakage

    Hello
    I am designing a charlieplexing LED drive scheme using an Arduino board.
    105751
    Connection are something similar to the above.

    LED1/2/3/4 are all RED LEDs with a Vf of ~2v.
    LED 5/6 are...
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    Closed: MIPI SPMI Interface vs I2C

    Hello - I do not have access to the MIPI specifications as I am not a member.
    I would like to seek advice on a high level, what the differences are between the MIPI SPMI interface vs. I2C vs SPI for...
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    Closed: Re: Buck Regulator efficiency vs. Input voltage

    Hi
    thanks for the replies. It would seem just like LDO's, most buck regulators are more efficient with lower Vin due to the internal NFET/PFET losses and inductor losses.

    Another question, is for...
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    Closed: Buck Regulator efficiency vs. Input voltage

    Hello friends,
    I was looking in regards to buck regulators and i am wondering why is it that, for a fixed output voltage/output load.... the regulator is more efficient with lower Vin, as opposed to...
  12. Closed: Re: Single cell vs Dual Cell Li-ion (3.7v vs 7.4v)

    Thanks for the reply.
    If my device (MCU/CODEC/etc) all operates at 2.8v, is it still worth it to use a buck regulator at 2.8v driven from Li-Cell operating from 4.2v to 3v?
    With a constant load of...
  13. Closed: Re: Single cell vs Dual Cell Li-ion (3.7v vs 7.4v)

    Hi, yes there are cost associated with series batteries. However from the calculations, it has the same energy density.

    Two 50mAH 3.7v in parallel = 100mAh - .37Wh
    Two 50mAh 3.7v in series =...
  14. Closed: Single cell vs Dual Cell Li-ion (3.7v vs 7.4v)

    Hi
    Need some advise.
    I am making a portable device using Li-Ion batteries and battery life is my #1 priority.
    My load on the battery is a MCU which is continously running and have a constant load....
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    Closed: Re: Help on envelope detector circuit

    FvM - The Greinacher circuit tip really helped.
    However I would think the capacitance value of C10 (47pF) and C13 (1.5nF) would need to be the same value if it was to 'double' equally right?

    - -...
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    Closed: Re: Help on envelope detector circuit

    Crutschow.,
    So if I understand you correctly, D4 would pass thru the positive +ve swing of the AC signal from the resonant circuit, whilst, D4 would pass thru the negative swing of the AC, kinda...
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    Closed: Help on envelope detector circuit

    Hi
    I had found a reference design from ST application notes on inductive proximity switch circuit....
  18. Closed: Re: [MOVED] Inductive sensor (Eddy Current) with DC output

    Hi, can you clarify on the pulse response measurement methods?
    How would this circuit look like?
  19. Closed: Re: [MOVED] Inductive sensor (Eddy Current) with DC output

    Thanks for you advise jiri.
    I have managed to make it work now using a RF diode detector on the output of the oscillator to achieve DC.
    This was using a winding wire and I achieved ~20uF out of it....
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    [SOLVED]Closed: Re: Printed Planar Spiral Inductor (Multilayer)

    Yes you are correct.
    It will all go in the same direction CW or CCW. I got confused with myself.
    The windings would be circling from the outside in, then a via, then the same winding directly under...
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    [SOLVED]Closed: Re: Printed Planar Spiral Inductor (Multilayer)

    Hi Keith,
    I have read the article. Thanks for it.
    It however does not mention of the layout implementation of the multilayer inductor.
    I would assume in the 4 layer spiral implementation, top...
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    [SOLVED]Closed: Printed Planar Spiral Inductor (Multilayer)

    Hi
    I am trying to design a spiral inductor on my PCB.
    I have a space of 10mm x 10mm for it, the good news is I also have 8 PCB layers to achieve it.
    There a lots of formula's for a single layer...
  23. Closed: Re: Current Drain measurement, DC vs RMS (what to use to calculate current drain)

    Hi, Is there any application from a current drain point of view do we use RMS?
    E.g., would I use RMS when measuring current drain from an Audio PA driving a 1kHZ tone?
  24. Closed: Current Drain measurement, DC vs RMS (what to use to calculate current drain)

    Hi
    I have the below measurements for device for my home project.
    94354
    As you can see, there is a significant difference in current drain between DC and RMS.
    I have a 1000mAh battery in which I...
  25. Closed: Re: [MOVED] Inductive sensor (Eddy Current) with DC output

    Hi, I don't quite understand how the comparator & pulse generator would be connected to the eddy-current sensor. can you please help elaborate jripolivka.

    Another thing, I managed to hack up a...
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