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 Simulating Quadrature Injection locked multiplier (tripler) in Cadence 

Last post Tue, Nov 5 2013 10:03 PM by rohan kr. 1 replies.
Started by rohan kr 22 Sep 2013 08:02 PM. Topic has 1 replies and 4128 views
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  • Sun, Sep 22 2013 8:02 PM

    • rohan kr
    • Not Ranked
    • Joined on Wed, Mar 28 2012
    • Melbourne, Victoria
    • Posts 10
    • Points 110
    Simulating Quadrature Injection locked multiplier (tripler) in Cadence Reply

    Hello

    Initial information - Using Cadence virtusoso 6.1.5-64b & spectre simulator for designing the followingquadrature injection locked frequency tripler. 

    circuit Diagram - 

    QILO circuit 

    The first input I gave was a 14.66GHz signal  The frequency spectrum of the output is as below:

    dft

    ANd then I changed the input to a close 14.46G , the output frequency still remains same as shown below.

    dft

     

     

     

     

     

     

     

     

     

     

     

     

     The core currents of the oscillator(Iosc) and injection current(Iinj) have been optimised such that a locking range of 5% should be there. But in the above case there is no injection locking happening. 

    Also, I am unsure about the phase noise plot of the QILO . I have put the relative harmonic as 3 as Andrew Beckett suggested in one post. But Cadence is still sweeping it for harmonic -1. I am not sure if it is because of the injection locking not happening and PSS not able to provide the correct 3rd harmonic of the tripler

    phase noise

     

     

     

      

     

     

     

     

     

     

     

    Can anyone PLEASE PLEASE summarize the setting for the PSS and pnoise (or QPSS or qpnoise) for this type of circuit  or check the PSS settings which I have uploaded here : 

    pss

     

     

     

     

     

     

     

     

     

     

     

     

     

     I have gone through most of the application notes & the solution post for injection locked oscillator.( I made sure as it is a driven circuit I havent selected the oscillator button)  

    Please guide me through this. Thanks in advance.

    Reference paper- A Low Phase Noise Quadrature Injection Locked Frequency Synthesizer for MM-Wave Applications - Musa et al.


    • Post Points: 5
  • Tue, Nov 5 2013 10:03 PM

    • rohan kr
    • Not Ranked
    • Joined on Wed, Mar 28 2012
    • Melbourne, Victoria
    • Posts 10
    • Points 110
    Re: Simulating Quadrature Injection locked multiplier (tripler) in Cadence Reply
    Can anyone offer some suggestion please ??
    • Post Points: 5
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Started by rohan kr at 22 Sep 2013 08:02 PM. Topic has 1 replies.