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Type: Posts; User: Mabrok

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  1. Closed: Out of band stability of RF power amplifier

    Hi,
    I have designed doherty power amplifier for 3.4-3.6 GHz band. After many optimization process, I get the required specifications. However, the simulation results show instability at 500 MHz to...
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    Closed: Re: RF Power amplifier stability

    I have added resistor in series and helped in enhancing the stability. but on the other side degraded the gain too much.
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    Closed: RF Power amplifier stability

    I have designed class AB Power amplifier for 3.4-3.6 GHz band. When i checked the stability, the amplifier was stable over the entire band (K>1). But for out of band at certain frequencies (0.5 to...
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    Closed: Re: Load pull simulation in ADS

    Thank you. In general case, for RF power amplifier design the device have to be stable from where until where? let's say that our required frequency band is 3.4-3.6 GHz.
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    Closed: Re: Load pull simulation in ADS

    Also I want to ask another question. For the amplifier stability, my amplifier is stable from 1 to 5 GHz, below 1 GHz is not stable, is that ok? (Note: the required frequency band for my design is...
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    Closed: Re: Load pull simulation in ADS

    Thank you for the valuable comments. For confirmation, is it correct that impedance at marker 3 is consider as the Zload, and input impedance is consider as the Zsource based on the attached image?
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    Closed: Load pull simulation in ADS

    Hi,

    In ADS load pull simulation results. Is it correct that the impedance at marker 3 is the Zload (7.161+j 2.480) which are using in output matching design, and input impedance is the Zsource...
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    Closed: Re: Power Amplifier Design

    Thanks for the valuable information. Is the same thing is considered for doherty sub-amplifiers (main & auxiliary)? I want to do a correct DPA design, but still confusing about load pull setting such...
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    Closed: Power Amplifier Design

    For load-pull simulation to extract optimum load impedance. How to set input power ? According to what?

    Thanks in advanced
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    Closed: RF Power Amplifier Design

    In power amplifier design. how to properly determine the biasing point of different classes such as class AB, Class C, and so on? How to do it through simulation using ADS?
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    Closed: Re: Amplifier layout in ADS

    Thanks for the information. How about the transistors and DC voltage sources and ground?
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    Closed: Amplifier layout in ADS

    How to get the correct layout for microstrip design in schematic of ADS? How to represent the transistor, DC voltage source, and the ground in layout and how to get the correct dimensions? kindly...
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    Closed: Re: Doherty Power Amplifier

    Thanks for the information. Do you have the idea about how to get I_carrier' & I_peaking through the simulation using ADS?
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    Closed: Broadband Power Amplifier design

    Is the design of power amplifier in the 3.4-3.6 GHz band consider as broadband? How to distinguish between wideband, broadband, and narrow band? Thanks in advanced
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    Closed: Re: Doherty Power Amplifier

    Thank you. These equations can be used to design real DPA (to be fabricated)?
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    Closed: Doherty Power Amplifier

    How to determine the impedance at combining node (Rcn) of doherty sub-amplifiers? Is it a standard for all DPA designs? Or depends on the design? Thanks in advanced154540
  17. Closed: Two-tone simulation of power amplifier design

    In the two tone simulation of power amplifier design, how much should be the spacing between the two tones? Thanks in advanced
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    Closed: Power amplifier impedance matching

    Is it possible to match complex impedance to other complex impedance using quarter wave impedance matching technique? And How?
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    Closed: Scaling factor in ADS

    How to find scaling factor in advanced design system (ADS) 2011?
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    Closed: RF Power Amplifier Design

    How to simulate Adjacent channel leakage ratio (ACLR) of Power Amplifiers?
  21. [SOLVED]Closed: [moved] Peaking stage of doherty power amplifier

    How to make the peaking stage of doherty power amplifier to turn on at a certain input power level through simulation using ADS? Thanks in advance
  22. [SOLVED]Closed: Re: Small signal gain (S21) of Peaking stage of doherty power amplifier

    Thank you, it is really helped me
  23. [SOLVED]Closed: Small signal gain (S21) of Peaking stage of doherty power amplifier

    For peaking stage doherty power amplifier (class-C biasing), when I simulate it separately using ADS I got small signal gain (S21 = -10 dB). Is that correct?

    Thanks in advanced
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    [SOLVED]Closed: Re: Power Amplifier matching network

    Thanks for your reply. I could not understand you. Could you please explain more?
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    [SOLVED]Closed: Power Amplifier matching network

    Hi,
    How to convert input impedance (in complex format x+iy) into real resistance in order to be used in designing an input matching network? By using source pull simulation in ADS i got input...
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