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Type: Posts; User: Anomis

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  1. Closed: Re: can i connect 2 rf amplifiers to get higher amplification?

    you can but your signal at output finally s always small hence it never reaches the requirement of the subsequent stages
    If you wanna make it larger you have to make sure that your second stage has...
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    Closed: Re: A Biasing problem in LNA circuit

    Yeah, all terminals are shorted together for Mosfet capacitors, that is weird to what i have seen so far. Can i remove the R0 here ?

    - - - Updated - - -



    For 1) because I connect the power...
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    537

    Closed: A Biasing problem in LNA circuit

    Hi all circuit designers,
    I have 2 questions reagarding biasing a LNA, as shown in the capture below:
    157930
    1/ For what i ve known so far, the R0 resistor is employed as a large enough value ...
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    Closed: Re: Coupler or Combiner?

    you are possible using a quadrature hybrid coupler (a type of directional coupler) as a combiner at the cost of 3 dB attenuation at branches 2 and 3/ output at 1 port and isolation matched load at...
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    Closed: Re: I/Q baseband Modulator Demodulator

    this technique is quite popularly used in bandpass modulation in Digital communication, you need to take a look at "Digital Communication book" (maybe chapter 4) from Prof. SKLAR first, then go...
  6. Closed: Re: Problem of impedance matching of Gilbert cell mixer

    I think you had better show your input impedance to examine whether or not your process is possible of doing input matching.
    Because any BJT has a rpi in parallel with Ccb hence we are possibly...
  7. Closed: Re: Why an input inductor required in all GPS LNA?

    I bet you r a little bit new to LNA design, a simplest answer regarding this stuff is to reduce significantly overall NF of this amplifier, because NF = 1 + gmRs*y*(w0/wt)^2, and Rs (= 50) s chosen...
  8. Closed: Re: Which transistor need to be chosen for designing KU-Band LNA Design high gain, lo

    + how many gain you wanna achieve for your sys ?
    + NF ?
    + How about your IIP3, P1dB ?
    If you can list out the above bullet points, it s easy to specify process n propose a suitable structure/ ...
  9. Closed: Re: How to include RF Transistor Vendor Kit in Advanced Designed Design(ADS)

    you are able to follow the guideline below to get your KIT imported
    http://https://drive.google.com/open?id=13yukFM5_rRca1oZ6DJ8iKuDsfbt1QtvE
    Have fun!!
    TM
  10. Closed: Re: How to plot Pout @1 dB compression point versus frequencies

    Here is same topic that s already discussed before, let take a look
    But personally, to the simplest solution, you can record P1dB @ each RF freq and then use whatever tools like matlab or excel to...
  11. Closed: Re: How is the maximum inductor value in a technology process is determined

    Here are some typical values of inductors as well as Q and peak freq in 65nm PDK, Let take a look at it to get more insight of real world process. In essence, the foudary does not recommend us to...
  12. Closed: Re: Where Can I buy Transformer Core Ferrites for Frequencies ABOVE 200 MHz ?

    i bet there are tons of companies over the world selling your devices, for ex: here is the link
    https://www.mag-inc.com/Products/Ferrite-Cores/Learn-More-about-Ferrite-Cores
    here also provides you...
  13. Closed: A measurement issue in Signal generator and Spectrum Analyzer

    Hi all,
    I need a help for this stuff:
    154734
    I set 10 dBm for output signal @ 2.5 GHz by Signal generator (Agilent E4438C), however my spectrum analyzer shows up the level of above 15 dBm. I...
  14. Closed: Re: [CIRCULATOR] What are main factors affecting to isolation of a Circulator?

    Hi FvM, thanks for your clueless
    Regardings PCB board, I designed all routes of 50 Ohm Microstripline to mitigate reflection back
    However, Isolation from board to board always changes in the range...
  15. Closed: [CIRCULATOR] What are main factors affecting to isolation of a Circulator?

    Hi all,
    I am studying some stuff related to wideband Circulator device in range of 2.3 to 2.5 GHz
    and the question is how can i control isolation route (magnitude and phase) ? for example from...
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    Closed: Re: Parasitic capacitor extraction: huge value

    Hi timof, this is about pre-layout simulation, even though my performance at 2.4 GHz looks good but the parasitics extracted by model here make me confused,
    I don't know what the problem is, in my...
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    Closed: Re: Parasitic capacitor extraction: huge value

    Hi sutapanaki,
    However, my question is : with such huge value, there could be a problem in RF design ?, it will short G n S together, for example, Zgs ~ 0 Ohm @2.4 GHz
    Does it make sense? or i...
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    Closed: Parasitic capacitor extraction: huge value

    Hi everybody,
    I am playing with 65nm samsung process and do explore some parasitics components in the straightforward testbench below:
    But the extracted cgsl(overlap capacitance between gate and...
  19. [SOLVED]Closed: Re: CMOS device characterization of Vth [Ref: CMOS Analog Circuit Design - Holberg]

    Hi rmanalo,
    I suppose that your predicted VT0 is handled well with linear regression model and your calculating step is correct. However, take notice that there is always a tolerance between...
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    Closed: 3phase bldc hall sensor problem

    Hello my friends,
    I am trying to drive a 350 watt,3phase, BLDC motor (DGW07-20j model) with stm32 micro controller. But I have problem with hall sensors because their outputs are not similar to the...
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