Type: Posts; User: albbg

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  1. Closed: Re: Noise Figure budget analysis for power combiner & divider

    If you combine two identical signal, perfectly in phase they amplitude will double while the noise (uncorrelated) will sum in power. Theoretically you can gain 3 dB NF. In practice you will have a...
  2. Replies

    Closed: Re: How can I measure this voltage and current?

    I think you should evaluate to complicate the circuit and use two linear optocouplers (one for the voltage the other one for the current) in order to avoid the ADC (and possibly other components) to...
  3. Closed: Re: Calculating electromagnet – magnetism vs heat

    Possibly this theses could help:
  4. Closed: Re: Will I be able to drive LED with attached analog circuit ?

    The LED wiring is not a problem, it will be always negligible with respect to R3
    Form the datasheet of the LED and the value in your schematic I can expect a current IF=2 mA and VF=3 V roughly. With...
  5. Closed: Re: Toroids EMI suppression choce choice of core material ?

    You can't use the specificed AL value at the frequency of 15 MHz to calculate the number of turns. If you have a look to the permeability vs. frequency graph you can see that at your frequency the...
  6. Replies

    Closed: Re: dc motor theory question??? Maths

    Please, find attached my solution.


    About the shaft powet, it is Ps=w*T, that is Ps=52.4*40 = 2096W or 2.8HP
    if the torque is 60 Nm we will have 32.6*60=1956W or 2.6 HP

    I did...
  7. Closed: Re: MAX485 modifications. Need help to find out what does it mean.

    I think (not sure) it specifies the carrier type: no suffix=tube, T suffix=reel. The sign+ means ROHS compliant
  8. Replies

    Closed: Re: RF Limiter not working as it should

    What you mean with " without biasing" ? DC level was 0 V, or the inductor was disconnected ?
    The inductor must be conected to ground directly or through a DC power supply, otherwise the DC voltage...
  9. Replies

    Closed: Re: Output of Variable gain amplifier?

    Yes, if we call Vadd the added voltage to the input of Rn with respect to Vin (that is the voltage applied to the non inverting pin), then

    Vout = Vin - Rf/Rn*Vadd

    Ideally if Vadd=0 then...
  10. Replies

    Closed: Re: why does this simple program not work

    You wrote "output=kpo+kio;" instead of "output=output+kpo+kio;"
  11. Replies

    Closed: Re: Finding X of L for an inductor

    There is a little mistake in the Akanimo answer: sqrt(2500-900)=40 ohm, then XL=60 ohm

    Furthermore if you want to calculate alfa, we know that tg(alfa)=im(Z)/real(Z), that is tg(alfa)=X/R.
    In our...
  12. Closed: Re: Need help with single-phase full-wave rectifier

    FvM gave a good hint.

    Having a look to intusoft's app. note, the center-tap transformer seems to be obtained paralleling the primary of two single secondary...
  13. Closed: Re: Need help with single-phase full-wave rectifier

    We can focus on the voltage on the secondary.

    I think you could have some simulation parameter to tune, f.i. RELTOL.
    As far as I can I'll try to simulate your circuit with microcap10 to see if...
  14. Closed: Re: Need help with single-phase full-wave rectifier

    Unfortunately your calculation is not correct. I've got a rigorous mathematical derivation starting from the general case of mutual coupling.
    Here is the results:

    151534 151535
  15. Closed: Re: Need help with single-phase full-wave rectifier

    Your calculation is correct: the coupling factor you used (0.99) can be neglected.

    I think the scale of the graph you represent the output waveform is too wide. Try to plot the output waveform...
  16. Closed: Re: What is the difference between characteristic impedance and normal impedance?

    I think you mean "nominal impedance". The characteristic impedance is the actual impedance of the transmission line, while the nominal impedance is the impedance that should have the line by design....
  17. Replies

    Closed: Re: PLL out of lock after several seconds

    You have to check the output of R and N divider. It could be the level of the rf signal sent back to the pll is too low. Also investigate if the charge pump is working properly.
  18. Replies

    Closed: Re: 90 degree phase shifted magnetic fields

    As far as I correctly understand your question, the signals to the primary coil are rectified, that means they are A*|sin(wt)| and A*|sin(wt+90)| (I supposed same amplitude).
    In this case the 45...
  19. Closed: Re: How to convert the power EIRP -13.03 dbuv/m at 300m to dBm

    dBuV/m is not a measure of power (or EIRP) but a measure of electric field E.

    Considering the spherical radiation the electric field in far field can be calculated distributing the power over a...
  20. Closed: Re: Having troubles properly simulating a rectifier in ADS

    The high frequency part of the circuit have to be developed keeping the wiring between components as short as possible. I'm referring to C3, C4, anode of DIODE1 and DIODE3, cathode of DIODE2 and...
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    Closed: Re: Current in series resonant circuit

    I think the reson is that you used a time step too large. Try with something like 1us
  22. Closed: Re: No amplificaiton observed when THS3091 op amp used on THS3095 Evaluation Board

    Did you properly drive the power-down signal, present only in THS3095 amplifier (pin 8) ?
  23. [SOLVED]Closed: Re: Specify component values for a given gain at a given frequency

    Part a is correct in boh image 1 and image 2.
    About part B, as suggested, just substitute s=jw and solve for the required gain (1 linear for the first circuit and 20dB for the second)

    What is...
  24. Closed: Re: Weird phenomenon when measuring the P1dB of a LNA

    What you observed is due to the self biasing of the transistor. Increasing the quiescent current the phenomenon should disappear.
  25. Replies

    Closed: Re: Applying KVL on an NPN BJT.

    Just place the voltage arrows across each element to see the equation

    Vee + Ib*Rb + Vbe + IeRe = 0

    is wrong. Doesn't matter the numerical value of voltage and current. The result is symbolic...
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