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Recent content by elpajuo

  1. E

    Need help centering my VCM and VID in an CMOS opamp

    Hi, as you can see in the images attached, I would like to center the linear regions on both graphs. One is a VDC sweep of VID vs Vout and the second graph is a sweep of VCM vs Vout This is using PTM 22nm BSIM models , my level 1 amplifier had both centered at 0,0 (well VID had a offset around...
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    Sub micron analog opamp design with BSIM PTS 22nm models

    Hi, I am currently designing an operational amplifier with hspice using short channel mosfets What is the design methodology for deep submicron analog design? I have seen there is a gm/id method for device sizing, but is there other better methods? My Level 1 operational amplifier designs do...
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    amplifying dc signal for measuring

    Thanks for the reply Ok, so I can use the op amp to make the gain into something noticeable for the datta logger. I am trying to measure how many times a battery powered device goes into sleep mode (100uA) and transmit mode (25mA) over a long period of time with the data logger. So once I...
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    amplifying dc signal for measuring

    I have a low current circuit where I want to log the current every 10s for a long period of time The current jumps from about 100uA to 25mA. I have a data logger that can log from 0 to 20 V, so I can add a 1 ohm resistor with the volt logger to measure current but it needs to be much higher...
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    Simple computer controlled mechanical device

    Thanks for the reply I have a lot of time to tackle this project. I need to implement it for a reasonable price, but does not have to be from scratch. Would using PLDs or FPGAs maybe make it easier to interface the mechanical device with the computer? The mechanical device would be very low...
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    Simple computer controlled mechanical device

    I want a device that can press buttons on a 10 button keypad and can be programmed to different combinations. I'm looking into about 1-2 seconds between each keystroke press. It will simulate a human doing the keystroke presses, and I want to be able to easily start/stop at different times and...
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    Simple computer controlled mechanical device

    Hi, I am new to these forums. I am trying to get pointed in the right direction on how to build a mechanical device controlled by a windows computer that can press be programmed to press different keystrokes (Eg the keyboard keys). At the most it would be a 12 keystroke pad being able to...
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    First time soldering tips for a dense proto board

    Hi, I am going to solder a dense proto board, it has over 100components with many connections to a small area board (5 by 5 inches) I have the solder wick and sucker Good temperature controlled soldering iron with fine tip Glue gun Are any specific wires better/easier to solder? I have no...
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    First pcb layout/routing using orcad

    Thank you so much for the tips, Ill try to post the layout when I get to the pc with orcad I will try the 8 mil width/spacing I am in the US and only need 1 board, the best price I have seen is the 4pcb.com going 4 layer they require min qty of 4 boards which is 264$
  10. E

    First pcb layout/routing using orcad

    Hello, I am using orcad capture and pcb editor to make a small pcb (around 4 by 4 inches). First time making a pcb. There is about 30 components and big connectors I am having a hard trouble routing all the components in a double layer pcb (price matters) It will be for digital signals and...
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    NBTI simulation tutorial using ELDO

    THanks a lot, I will try it
  12. E

    NBTI simulation tutorial using ELDO

    Ok I am also trying to do some nbti and HCI simulation Using bsim latest models bsim4 and hspice or smartspice. which are the parameters to simulate the NBTI? Just do transient analysis with the applied negative bias ? I haven't been able to find much information on how to do a stress test
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    op amp two stage stability

    Thanks for the help I was able to get less than 1v deviation in montecarlo for closed loop gain of 30V with circuit in figure below I have some more questions -- To bias the input stage for a CM voltage of ground I had to add those two 11k resistors, is there a better way to do this? -- Is...
  14. E

    op amp two stage stability

    Thanks I tried the unity feedback and still goes to the rails I did the same with a simple common source amplifier with a diode load The open loop gain was going to the rail with the 5% Vthreshold variation which is expected, but with the feedback network the closed loop gain varied by less...
  15. E

    op amp two stage stability

    Thanks for the reply I tried changing the single ended output into the first stage and adding the miller compensation The nominal closed loop gain is 55V/V but as we can see in the schematic, montecarlo varying threshold voltage for the transistors by just 5% throws the gain to 0 for most of the...
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