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Recent content by eengr

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    MSC050SDA120S_L1 spice mode not working in Qspice

    Hi, thank you for the feedback. Yes I tried adding series resistance with source & also in each branch of the diode and inductance as well (Small to big values 0.1R to 5ohm for R & 100nH to 1uH for L) but it does not want to work. Where could I find a good example/help explaining the convergence...
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    MSC050SDA120S_L1 spice mode not working in Qspice

    Hi I am trying to use the SPICE file to create a model (subckt) for the SiC diode I have used in the attached circuit to implement a full bridge DiodeFB_V1b.qsch (25.9 KB) similar to the 2nd circuit in attachment with generic diode. But I keep getting the error time step too small Fatal error...
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    HBM Model Simulation ESD - TINA TI

    Hi I am trying to understand the behaviour of Human Body Model simulation circuit in Tina TI. I found a circuit provided by TI (as below) I ran a transient analysis of this and got the curves as shown in the graph above (for Vout & AM1) The way I understand is: that Human body side is...
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    Transimpedance and Potentiostatic circuit oscillations

    Yes you were absolutely correct. It was assembly issues that was causing these problems. I saw the board under the visual inspection camera and it was awful. Dry joints, too much flux. I now repaired the joints and thoroughly cleaned the board and the first board is working fine now. Thank you...
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    Transimpedance and Potentiostatic circuit oscillations

    OK i took some traces. I first built Potentiostatic circuit only. The OPAMP used in this case was SOT-23 LPV821 I used R13 & R14 as 11K & 13.3K respectively. I used 10uF cap as C1. I also closed the loop of OPAMP by connect a short-link wire between Counter Electrode & Reference Electrode...
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    Transimpedance and Potentiostatic circuit oscillations

    Has anyone here had any such issues with Rail ceramic caps going low impedance when plugged in circuit and then back high impedance when voltage is taken off? Or if it is happening because the Opamp is going unstable and causing the rails to load heavily!?
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    Transimpedance and Potentiostatic circuit oscillations

    I have done three different revisions on PCBs just to tackle this issue. The board also have other digital circuit like uC and memory etc. But then I decided just do a standalone board for this. Through out the testing these different boards, I have been experiencing this high current problems...
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    Transimpedance and Potentiostatic circuit oscillations

    Yes I originally started with using 10R Rload from your mentioned alpha sense note but it was oscillating. I was then advised to use 100R to 470R I have used high value bypass caps like tantalum 47uF and removed all on board regulators so powering directly from benchtop TTI power supply. I...
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    Transimpedance and Potentiostatic circuit oscillations

    Hi I am trying to interface an O2 Electrochemical sensor on my board. I have used potentio-static & transimpedance amplifier configuration. I have tried to use what I found in number of application notes online. My circuit is as shown in the picture Rail bypass caps of 100nF & 1uF not shown...
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    TI TINA simulation with AD8603

    TI TINA simulation with AD8603 over voltage not picking up Hi I am new to TINA TI simulation world. I used one of their example circuit 0-10V @ 10mA DAC Interface Circuit ( see attached) I noticed that original OPAMP in the example circuit was OPA251 and it is powered using 32V DC (single...
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    Qi charger power (Watts) rating

    Hi I am bit confused about the Wattage rating of Qi (wireless chargers) e.g., they come in different flavours as 1W / 5W/ 7.5W / 10W etc I know P = V x I But, I am struggling to understand how the above Wattage translates into Voltage & current e.g., I were to charge a Li-ION battery...
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    Inductance meter (LCR meter) for Qi receiving coil measurement

    Hi I am working on a wireless power receiver design (Qi compliant) As part of design I need to measure Inductance of my receiver coil @ 100kHz / 1Vrms (using the test setup as explained on page -29 of of following document) https://www.ti.com/lit/ds/symlink/bq51050b.pdf The coil I am using...
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    [SOLVED] ASMD Chart decision boxes for OR condition

    Thank you very much. I did not realise that 'state blocks' and 'Decision blocks' could have multiple exit and entry points respectively. I was working on the assumption that: State block could have one Exit point only Decision block could have one Entry point only...
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    [SOLVED] ASMD Chart decision boxes for OR condition

    Hi I am trying to prepare an ASMD chart for my VHDL design. My question regarding ASMD decision boxes: Could we have multiple conditions to be checked mentioned in single decision box? I have seen some examples where people usually use multiple decision boxes for multiple checks. e.g., for...
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    Parking lot occupancy counter State Diagram

    Thanks, that worked with two states taken out
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