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Circuit design

  • Multiple SRAMs 1 data bus

    I am creating a pcb with multiple srams connected to an FPGA on 1 data bus. I intend to clock the srams and the fpga at 150 MHz. I am concerned about what issues will arise when connecting mutliple srams to the same data bus (only 1 sram will have its output enabled at a time). For example should I worry...
    Posted to PCB Design (Forum) by neseroth on Fri, Jan 25 2013
  • Simulating Crystal Oscillators is Much Easier in MMSIM12.1 - Part 2

    Greetings, Simulating crystal oscillators got a lot easier in MMSIM12.1... We have made enhancements to both Harmonic Balance and transient analyses. In Part 1 , I discussed Improvements to the Harmonic Balance use model. With the new streamlined Choosing Analyses form, you now can focus on getting your...
    Posted to RF Design (Weblog) by Tawna on Thu, Dec 20 2012
  • Simulating Crystal Oscillators is Much Easier in MMSIM12.1 - Part 1

    Greetings! Simulating Crystal Oscillators got a lot easier in MMSIM12.1... We have made enhancments to both Harmonic Balance and Transient analyses. In Part 1, I’ll cover Improvements to the Harmonic Balance use model. With a streamlined Choosing Analyses form you can now focus on the simulation...
    Posted to RF Design (Weblog) by Tawna on Wed, Dec 19 2012
  • New PCB Etch Technology. No CF4 required. Uniform results.

    Plasma Etch, Inc. Eliminates Green House Gas Used In The Production of Printed Circuit Boards. Plasma Etch, Inc. of Carson City, NV has announced it has developed and is now offering the worlds first truly green plasma etching system to be used in the manufacturing production of PCB’S (printed...
    Posted to PCB Design (Forum) by Plasma Etch on Mon, Dec 10 2012
  • PSPICE Simulation Error "Extra Text On Line"

    Hi, Working on an audio amplifier project for school and I'm trying to simulate the circuit in Pspice. When I actually go to run the simulation, I keep getting an "Extra Text On Line" error. Here's the output sim file: **** CIRCUIT DESCRIPTION **************************************...
    Posted to Cadence Academic Network (Forum) by luckyleo on Tue, Nov 27 2012
  • TI494 part and transformer modeling

    My group and I are trying to build a transformized h-bridge dc-dc converter. I was hoping to model this on spice, but have had no luck so far. First I am trying to use an ideal transformer but do not see how you enter the turns ratio to make it step up at the right ratio. Also I was hoping to try to...
    Posted to PCB Design (Forum) by Joel2012 on Mon, Nov 5 2012
  • not able to design 7447A 7segment IC in Pspice

    I tried to design a circuit using 7447A IC the 3 connections - LT, RBI and RBO are in active low. I am not able to get valid output. What should be the inputs to these 3 connections to get a valid ouptut? I have not been able to get any help regarding this on the net. They all talk of 7447 with 16 pins...
    Posted to Cadence Academic Network (Forum) by tushi on Fri, Dec 2 2011
  • Spicy Schematics for iPad - great for students, engineers, and professors!

    Spicy Schematics has gone through a few revisions and has some great new features! Create circuits with your fingers then save as, share with one-click via email or upload to the Spicy Schematics Online Circuit Library where others can download, and make screenshots for presentations ... use the group...
    Posted to Cadence Academic Network (Forum) by EdPat on Thu, Nov 3 2011
  • 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
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