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Recent content by InspectorGadget

  1. I

    Stereo/Mono mic for car radio

    Hi all, Just a quick sanity check here. I've a car radio with built in phone bluetooth capability. There's the option to install an additional microphone to improve clarity. I ordered a little mic online, but it has a stereo 3.5mm jack and won't work with the radio. I tried the radio with a...
  2. I

    Cadence/Virtuoso Plot Voltage Sweep

    Ok, I've figured out that what I need is a parametric analysis and I know how to run this. What I don't know is a function to plot frequency versus each voltage stepped in the PA. Also, I think I'll need some way of not calculating the frequency for each step until after a so many nano seconds...
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    Cadence/Virtuoso Plot Voltage Sweep

    I'm doing simulations on a VCO using Cadence at the moment (relative n00b to Cadence). I've got my circuit functioning and have a plot of the transient performance of the circuit for a set control voltage. What I'd like to do is sweep my control voltage and generate a plot of voltage vs...
  4. I

    Simulating Cross Coupled VCO

    As part of an assignment for my RF course I've been asked to pick an element of a specific RF circuit from a research paper given to us and do some simple simulations of that device. The part I chose was the Voltage Controller Oscillator from a PLL. Our task is pretty vague, but essentially we...
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    Designing a CMOS op-amp

    The project is going well. I've managed to meet all the specs that were set out so far. My one problem with the design is that I'm seeing a systematic offset voltage on the output when performing my transient analysis (well it's always there, just obvious with transient). I've sized my...
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    Designing a CMOS op-amp

    Ok, I think I'm nearly there. I need to verify my open loop gain however, and this requires lambda of the process which I don't think I have? These are the process parameters I've been using: **broken link removed**
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    Designing a CMOS op-amp

    Thanks again guys. I've never before seen it referred to as Beta either but at least now I know that it is referring to K. In the A&H design process he also assumes we know the small signal gain of the pmos transistor M3 that's configured as a current mirror with M4. However this...
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    Designing a CMOS op-amp

    I'm dealing solely with CMOS design here, not BJTs. The equation I'm referring to is on page 271 of the 2nd edition, 6.3-15. In this design however I think I'm only dealing with the open-loop specifications, so don't know how I could determine anything about the feedback factor?
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    Designing a CMOS op-amp

    Would that be what I'd normally have said is Av = gm1*gm2? Where gm1 and gm2 are equal to A and B in your post? The only other piece of information given is Vcm = 1.5V applied to the positive input.
  10. I

    Designing a CMOS op-amp

    Is it calculable before building the op-amp?
  11. I

    Designing a CMOS op-amp

    Thanks again. Making progress here after receiving pointers from you guys. School-boy errors! What is beta referring to in the A&H book? It is used in voltage calculations here. Only beta I've come across in the IC design world has been for the gain of a BJT...
  12. I

    Designing a CMOS op-amp

    Thanks guys. I'm attempting to follow the design procedure in the Allen and Holberg book. When the design is left so open ended, how would I choose appropriate oxide capacitance, threshold voltage, oxide thickness etc etc? The approach in the book assumes I have these values to hand.
  13. I

    Designing a CMOS op-amp

    I have an assignment to design a CMOS op-amp for uni. My problem is I don't know where to even begin with the design process. The following has been given: DC Loop Gain: >80dB Phase Margin: >60* Gain BW product: >15MHz Power Dissipation Target: 1mW Supply Voltage: 3.3V Bias Current: 100uA...
  14. I

    Digitally Dimmable LED Driver

    Thanks but I think that's purely a DC driver. I require one for AC mains operation but that is digitally dimmable (i.e.not triac dimming). - - - Updated - - - Or is it somehow possible to control a triac with a microcontroller?
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    Digitally Dimmable LED Driver

    I'm doing a project and want to use a microcontroller to control an LED from 230Vac mains. What I'm looking for is an LED driver that can be digitally controlled (i.e. PWM for dimming) but that operates with ac mains. Most of the drivers I can find seem to only achieve dimming using a triac...
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