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Noise Figure of an upconverting mixer under input IF signal

bennys

I'm trying to simulate the noise figure of a transmit mixer as a function of input IF power. 

From the cadence tutorials it seems as if the HBnoise sim is performed under small signal conditions where the input IF port is set to DC

(for example in http://www.cadence.com/blogs/rf/archive/2011/03/10/tips-for-simulating-a-transmit-mixer-in-spectrerf.aspx, its stated "If you are running PAC or Pnoise, you set the IF sourcetype to dc so that the LO is the only sinusoid in the system (Edit Properties on your IF port in the schematic). Since the input for this example is sinusoidal, we will choose Harmonic Balance. " )

How whould you recommend to perform a noise figure sim with IF signal applied.

 

In addition when I look at the noise separation print form it shows that the noise of the mixer comes from a biasing circuit which is AC disconnected from the circuit..., this must be an artifact and can not be the real noise source of the mixer, not sure but maybe you have some input on this as well? 

  • Tawna said:

    Please note that the GPDK180 is being removed from the RAK.  It was included by mistake.  To get the GPDK180, contact your local Cadence AE - Also see Article 20158565 .

    Thank you for bringing this to our attention, Frank.

     best regards,

    Tawna

    A GPDK is included in many RAKs. In my opinion, this is a good idea, because it makes installing the RAK much easier. I assume that much fewer people would use the RAKs if you first have to file a service request to obtain the GPDK and have to install it separately. These service requests will also generate additional work for Cadence support personnel.

  • Frank,

    The reason why it is supposed to be a separate download is because there's a click-through license to use it. It used to be that the pdks were available under a special web site (pdk.cadence.com) but that site has been retired, and so accessing via a support case is a temporary measure until the new location is sorted (on support.cadence.com probably). So you needn't worry about our workload - we already are trying to address this.

    Some of the RAKs contain a much-reduced version of a GPDK.

    Regards,

    Andrew.

  • Andrew,

    Thanks for the explanation. By the way, there is also a click-through license when you download the RAKs (which you as a Cadence employee might not see), so this might already be covered.

    Best regards,

    Frank

  • Hi Frank,

    If you see other RAKs with Cadence gpdks in them, please let me know.

    As an engineer who likes to get things done quickly, I agree that it is easier if the gpdks can be included.  :-)    However, we need to comply with our internal Processes and Procedures.   I am right in the thick of this...I will update the COS Article when the gpdk180 is available on downloads.cadence.com . 

     

    best regards,

    Tawna

  • GPDKs (or parts of them) seem to be included at least in the following RAKs:

    • Basics of Inherited Connections
    • Analog-on-Top Mixed Signal Implementation: Virtuoso Black Box flow with IC61 
    • IC 6.1.5 Constraint Driven Custom Design  
    • Layout Design in IC 6.1.5
    • IC6.1 Front to Back Overview
    • amsDmv - AMS Design and Model Validation
    • Schematic Model Generator 
    • Virtuoso Visualization & Analysis (ViVA)
    • Analog Design Environment XL (ADE XL) Workshop 

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