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Circuit design

  • Voltage stays on when power is removed

    Hello all, I designed a prototype circuit for my MSP430 and other components. It is powered by two voltage regulators and a current source. What confuses me is that after I remove the battery power (4.2V) from the circuit, it does not turn all the way off. V+ drops to 500mV and then drops so slowly that...
    Posted to PCB Design (Forum) by jmh1022 on Tue, Oct 18 2011
  • Modifying $Location in Concept using a script

    We set a prefix to our components in a design based on sheet number. Is anyone aware of an existing Concept HDL script to modify the location property? We use reuse blocks so this would need to be done at with occurance edit mode enabled. This is iniatially set by using the ref des pattern feature during...
    Posted to PCB Design (Forum) by mabo60 on Thu, Sep 22 2011
  • Spicy Schematics - Now with Spice Simulation

    Hello everyone .. I wanted to let you know about a new application I just got approved for the app store, it is the first iPad app for creating circuit schematics and running spice simulations! The best part is that it outputs spice formatted netlists from the schematics you design, and you can email...
    Posted to PCB Design (Forum) by EdPat on Thu, Apr 28 2011
  • Analog Design vs. Automation -- Why Are They At Odds?

    Back in 2002 and 2003 there was a lot of talk about analog synthesis being the "next new thing" to close the productivity gap between analog and digital designers. Well, I hope you didn't hold your breath for this! That promise failed mostly because analog design was still a custom design...
    Posted to Custom IC Design (Weblog) by Nigel on Tue, Aug 17 2010
  • New Time-Saving Feature in IC6.1.4 ISR2: Plot S-Parameter Data Directly From ViVA!

    If you haven't heard about it....there is a new feature in IC6.1.4 ISR2 which makes troubleshooting circuits containing nports ( s-parameters ) much easier and faster! Starting i n IC6.1.4 ISR2, you can now plot s-parameters directly in ViVA (without having to create a test bench and run a Spectre...
    Posted to RF Design (Weblog) by Tawna on Thu, May 20 2010
  • Analog Behavioral Modeling - What Language Do You Speak?

    An increasing number of mixed-signal design teams are contemplating adding analog behavioral modeling to their repertoire in order to achieve reasonable simulation speeds. Utilizing analog behavioral models can yield simulation performance improvements that can make full chip verification a reality....
    Posted to Custom IC Design (Weblog) by MS Guy on Tue, Mar 2 2010
  • NPORT S-Parameter Model Enhancements

    In MMSIM 7.2, two new parameters have been added to the Spectre nport primitive: datatrunc and causality . In MMSIM 7.1, passivity checking was added. The nport now has causality correction, passivity checking and enforcement, and the ability to remove small couplings terms from the input s-parameter...
    Posted to RF Design (Weblog) by Tawna on Wed, Dec 30 2009
  • Getting a Feel for RF

    It was a delight when I read the blog by Bill Schweber of TechOnline's RF DesignLine titled “ Getting some basic RF experience ”. I was surprising pleased that somebody took the time to talk about how one might get the feel for RF. That is because what Bob talks about is more or less...
    Posted to Custom IC Design (Weblog) by TomC on Wed, Apr 29 2009
  • 2009 RFIC Symposium in Boston - Are You Going?

    If you are an RFIC designer then I hope you are planning on attending the 2009 RFIC Symposium and the International Microwave Symposium (IMS) which will be held in Boston, Massachusetts, as the centerpieces of Microwave Week 2009, scheduled from Sunday June 7 through Friday June 12, 2009. The 2009 RFIC...
    Posted to RF Design (Weblog) by TomC on Mon, Apr 27 2009
  • Calculating Large Signal Phase Noise Using Transient Noise Analysis

    My name is Alan Whittaker and I'm in Cadence's Custom IC Proliferation Group. We support Cadence's Technical Field Organization (the AEs) and Cadence customers during the introduction and adoption of new and advanced EDA technologies. I'll be posting here from time to time on methodologies...
    Posted to Custom IC Design (Weblog) by alanw on Thu, Mar 26 2009
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