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Recent content by jakin

  1. J

    PCB layout consideration for ASRAM

    Hi, eda: The vendor did not give PCB suggestion for ASRAM. Thanks for your reply.
  2. J

    PCB layout consideration for ASRAM

    Hi, all: Please give me some suggestions on PCB layout for 1Mx16 high speed Asynchronous SRAM. I know I need to do a delay matching for signal pins. what else that I need to put into consideration？　How to prevent the crosstalk ? Thanks in advances, Jakin
  3. J

    What is the difference between DLL and PLL?

    Hi, All: I need some topic of DLL (delay lock loo) and PLL (phase lock loop) Can anyone tell me what is the different between DLL and PLL ? why we need DLL in the system ? THANKS IN ADVANCE Jakin
  4. J

    Problem in P-cad 2006 as I lose the pattern for a new component

    I am having trouble with P-cad 2006. I created a symbol and pattern for a new somponent. After generate both symbol and pattern together to be a new component, I lost the pattern. Is there anyone know how to solve this problem? I am deeply appreciated. Thanks in advance, jakin
  5. J

    Which PCB Design tool is better

    thanks
  6. J

    Which PCB Design tool is better

    Hi, I want to use P-cad and Electronic WorkBench to route the PCB layout, but I am not sure which tool is better for design a four-layer board. Thanks for advances :D
  7. J

    Help me learn doing a layout simulation in ADS

    Re: for help ADS is usually to fab Microwave circuit, and what is your problem
  8. J

    differential amplifier with unity gain

    I think you can use telescopic Amplifier to get a better unity gain.
  9. J

    Problem with voltage drop

    Hi, kevpat: Thanks for your help. The voltage drop on the supply source is dropping from 1.8 V to 0.96V. Is this about impedance or something else? Thanks for advances.
  10. J

    Problem with a big voltage drop on a PCB

    Hi, All: I have problem with a big voltage drop on my PCB. When I connect my PCB with 1.8V from power supply, I saw a significant voltage drop and the current rises up 0.05A. Can anyone tell me what this problem is ? My assumption is a short loop in the PCB. I do not know I am right or wrong...
  11. J

    Problem with voltage drop

    Hi, All: I have problem with a big voltage drop on my PCB. When I connect my PCB with 1.8V from power supply, I saw a significant voltage drop and the current rises up 0.05A. Can anyone tell me what this problem is ? My assumption is a short loop in the PCB. I do not know I am right or wrong...
  12. J

    What is level of modulation

    Hi, I cannot picture 4-level modulation. Does that mean 1-level and 2-level and 3-level ,and the end is 4-level ? Please give me some definition. Thanks in advances Jakin
  13. J

    What is the main difference between an ordinary op-amp and a telescopic op-amp?

    Re: telescopic op-amp Yes, telescopic op-amp gvies you a high gain ,but there is also a trade-off for your phase margin. Thus, you need to play with your VON and pay attend on 1/gm and CL's value.
  14. J

    Rail to rail circuitry

    Hi, I have question in my mind for a long time. What is a rail-to-rail circuitry? What is "rail-to-rail" standing for? Thanks for your advance~!
  15. J

    I am a beginner to work on micro-controller

    Hi, All: I need to develop a code for micro-controller(PIC16F48) in order to operate DDS device from Analog Device, which will produce a waveform as signal generator. I do not know how to begin the development. Can anyone give me any suggestion? I lookover data sheet,and there are many...
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