Home > Community > Forums > Custom IC Design > Virtuoso Envlp Analysis Problem with Thermometer Waveform as Input

Email
* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

Cadence Contacts

Global Office Locator
Find Offices worldwide »

Sales Inquiry
Request for Product information »
Cadence Channel Partners »

Corporate Headquarters
Cadence Design Systems, Inc.
2655 Seely Avenue
San Jose, CA 95134
Phone: 408.943.1234
* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

 Virtuoso Envlp Analysis Problem with Thermometer Waveform as Input 

Last post Wed, Jan 23 2013 7:22 AM by Richard85. 0 replies.
Started by Richard85 23 Jan 2013 07:22 AM. Topic has 0 replies.
Page 1 of 1 (1 items)
Sort Posts:

  • Wed, Jan 23 2013 7:22 AM

    • Richard85
    • Not Ranked
    • Joined on Tue, Jan 22 2013
    • Posts 1
    • Points 5
    Virtuoso Envlp Analysis Problem with Thermometer Waveform as Input Reply

    Hi All,

    I am a beginner in TX IC design. Now I am using virtuoso IC6.1.5.72 and MMSIM101 to simulate a RF modulator. I need to test its linearity and EVM. So I want to perform the envlp analysis. However I met a problem:

    First I use the ppwlf to source my saved matlab ASCII data file, and then feed to a verilogA block written by myself, which transforms the pwl waveform to the thermometer coded waveform. I need it as switching input signal to my modulator(kind of switching PA). For simplicity, I just use 1LSB to do single bit test. However, the envlp results show that the voltage spectrum after my verilogA decoder is all 0 level. The pwl input signal spectrum of the decoder is all right. I also did a comparison simulation, feed my modulator directly with ppwlf source, the signal will not be pulled all down to 0, and the specturm of the input is OK. But I think this PWL signal is not the signal I want. I simulated my circuit using transient analysis, it works. Does envlp only support PWL waveform as input? Can it be thermometer coded waveform? Does anybody know how to solve this problem?

    Best Regards,

    Richard 
    • Post Points: 5
Page 1 of 1 (1 items)
Sort Posts:
Started by Richard85 at 23 Jan 2013 07:22 AM. Topic has 0 replies.