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  1. Z

    Different Vt on the same diffussion (Need Pointers)

    Hi Everyone, I'm at the dead-end here and don't know what to do, really need your help. I'm having a layout design in such a way that two transistors are sharing the same diffussion. (Refer to the picture below) Where the first transistor drain is connected to the second transistor gate The...
  2. Z

    Transmission Gate Propagation Delay

    gate propagation delay Hi everyone, I'm currently performing failure analysis on one my devices. I would like to know which of Design (Design A and B) have a longer propagation delay from the Input to the Output (refer to the diagram)? Assuming that all the transistor parameters are...
  3. Z

    Can anyone help to intepret this verilog expression?

    Thanks for the answer. Your right I need to have to learn more on the verilog basic syntax. Any books that you can recommend to learn the verilog basic syntax? Hmmm......was wondering: Why both ndata and data be the same values when one is concatenated with: data_background and the other is...
  4. Z

    Can anyone help to intepret this verilog expression?

    Hi, I'm a noob in verilog language, I was looking through a verilog code an encounter this expression: parameter DATA_WIDTH = 72 reg [DATA_WIDTH - 1: 0] data; reg [DATA_WIDTH - 1: 0] ndata; wire [1:0] data_background data <= { (DATA_WIDTH + 1) / 2 {data_background}}; ndata <=...
  5. Z

    Please Help. I need some ideas to isolate this problem :(

    Re: Please Help. I need some ideas to isolate this problem : hi dkace, i show 4 cells in the row. The driver-multiplexer between the dummy and driver-multiplexer1 is failing. The dummy cannot be toggle as I cannot connect it to an input (it has no fan-in) since it is just a dummy or a...
  6. Z

    Please Help. I need some ideas to isolate this problem :(

    Re: Please Help. I need some ideas to isolate this problem : hi dkace, Thanks for replying. the problem is the driver-multiplexer cannot be tap out directly out of the FPGA. But I have done the following: The top eye view of the connection would be: input > driver-multiplexer > bus line >...
  7. Z

    Please Help. I need some ideas to isolate this problem :(

    Hi guys, I need your help. I'm actually working on isolating a failure on an FPGA. From the electrical analysis I was able to identified the failure was caused by a driver or a multiplexer (Circuit.jpg) which was stuck logic 0 instead of driving a 1. I was able to disable the driver. In hope...
  8. Z

    How to interpret this value 3.3/2.5?

    what is value of 3.3 and 2.5 Hi, I'm looking at the datasheet and I came across this description for a VCCSEL pin. When they say VCCSEL can control whether a 3.3-/2.5-V input buffer or 1.8-/1.5-V input buffer. Does it mean it can receive input voltage of 3.3 and 2.5V or 1.8 or 1.5V? Thanks
  9. Z

    What is leakage current?

    Hi guys, Does anyone know what is leakage current? How is it cause? If for example a device that was tested on a tester board have a very high leakage current how to overcome this problem?
  10. Z

    Can anyone help me explain this terms?

    Hi, Can anyone help me explain this terms? 1. Metal7, Metal8, Metal9 - Is there any website that provides a clear explanation on the die fabrication process? 2. Clock tree 3. Parasitic fanout Thanks
  11. Z

    How to implement a 2x clock multiplier in digital logic?

    clock multiplier logic I'm sorry but i still could not see how this can be implemented using basic logic gates or with a flip flop. Can anyone help me to illustrate the digital logic schematic for the clock multiplier?
  12. Z

    How to implement a 2x clock multiplier in digital logic?

    Hi, Does anyone know how to implement a 2x clock multiplier in digital logic. I.e frequency of 1kHz to 2kHz? Thanks
  13. Z

    What is NOT gate push-back technique?

    not gate push-back Hi, Can anyone explain to me what is NOT gate push-back technique? Thanks
  14. Z

    How to slow down servo motor?

    servo slow down Hi, I was working with a servo controller recently. My initial design was using two 555 timer. One is an astable which generate 20ms period and a monostable which i use a potentiometer to control the pulse duration. I was able to control the speed and the position of the servo...
  15. Z

    Floating node create problem in the switching circuit

    Good day everyone, I was working with the switching circuit which is provided by IanP. I encounter some problem with the floating node which is the connection to the microcontroller. As when the microcontroller is off and the power supply connecting the 9V is on it generates a high impedance...
  16. Z

    Large voltage drop in MOSFET

    I just develop the circuit of PNP/NPN pair using BC327 and BC337. It gives an excellent low voltage drop of about 0.2 V only. I have yet to test it on my load the only load i use was a volt meter. The best part is it is cheap just cost me less than a dollar to construct :)
  17. Z

    Large voltage drop in MOSFET

    Thanks guys for such a wonderful suggestion. But all your suggestion suggest of driving with a much higher or lower voltage. Such as 15V etc. However the only power supply I have is approximately 9 V battery which is a combination of 6 AA batteries. Is there any other way without require a...
  18. Z

    Large voltage drop in MOSFET

    Hi guys, I'm rather new in power switching circuits. I'm using a IRF 640 N-channel mosfet with the drain connected to approximately 9 V and the source to the load. I'm using the MOSFET as a switch to turn on my power supply using a microcontroller this power supply will be fed into a 5V...
  19. Z

    how to turn on 5V regulator digitally

    lm317 5v regulator Hi, I'm working on a project that runs on two 5V regulator. I need to on the 5V regulator after a delay of 2 seconds after the first regulator is turn on. Is there any regulator that I can use that can turn on the regulator digitally ( i.e with a control signal). Thanks
  20. Z

    Soldering Iron for Surface Mount Device

    Hi guys, I'm working on project which require soldering surface mount devices. Does anyone have any recommendation of soldering iron station with good temperature control. Thanks

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