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Simulating Quadrature Injection locked multiplier (tripler) in Cadence

rohan kr

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.

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