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Recent content by nanock

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    [SOLVED] ultra low current sensing circuit

    Thanks a lot Klaus. That is perfect. So when the datasheet says the resolution is 4aF, AD7745 can detect for example 4.004fF or 4.016fF and the accuracy is 4fF so when the output is 4.004fF maybe it is 0.004fF or 8.004fF. Am I right? On the other hand, what is effect of PCB soldering? I mean...
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    [SOLVED] ultra low current sensing circuit

    Hi, Thank you very much for AD7745/AD7746. But the datasheet mentions that the accuracy is fF limit. What is the difference between accuracy and resolution in AD7745/AD7746? Regards
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    [SOLVED] ultra low current sensing circuit

    hi, Is there any off the shelve circuit for sensing or monitoring currents of femto to atto ampere? I have four capacitors that have initial fixed and equal value of 5pF. Their value changes with resolution of tens of zF, 10^-18F. One way is to sense the attoampere current. Even if there were a...
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    ASIC for MEMS Gyroscope

    hi dear friends, Is there any ASIC chip just like SWS1110 for MEMS Gyroscope interface readout and control? **broken link removed** it is appreciated if there were any discrete off the shelve circuit for readout and control. Best regards
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    MEMS Gyroscope driving and sensing chip

    Hi, Consider that you have a mems gyroscope, e.g. Analog Devices ADXRS620. But assume it is just a simple MEMS gyro and there is no circuitry to drive or sense, just a pure MEMS Gyro with no circuitry. Now, I want to interface this MEMS Chip with electronics. I want to drive it, place it in a...
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    [SOLVED] noise level of voltage source vs current source

    Hi, assume there is a simple connection of an ideal voltage source with a resistor. on the other hand, there is a current source connection with a resistor. I want to measure the resistance in each circuit. now, 1- for measuring resistance of a 10k or higher, it is preferred to use voltage...
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    [SOLVED] Verilog Best Manual for Beginner

    Hi Dears, I will be wondering if you recommend a good reference for me to begin verilog hdl? Thanks
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    [SOLVED] impulse detector and holder

    Hi, I have an output of impulse signals as shown below and I want a digital or analog circuit to trigger from one state to an other. Assume your circuit is in logic '1' and you want to switch when impulse signal comes. thank you very much
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    [SOLVED] Direct Digital Frequency Synthesis with fractional steps

    Hi, I implemented a integer-N pll based frequency synthesizer but it takes 2m second to lock at desired frequency. But my adviser didn't accept it. Now I want to use DDFS but my project's details are as below: 1- output frequency between 880 MHz and 912 MHz 2- reference frequency 880 MHz or...
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    voltage controlled RING oscillator Gain plot

    hi, I just used a vco in a pll with gain plot as below. but it locks on 875 MHz instead of 880 MHz. IS the following plot true for vco? thanks
  11. N

    digital filter realization

    Hi, I'm completely familiar with analog filter design and realize them with lumped or active components. But how can I convert an analog filter or any transfer function in s-plane to a digital filter or z-plane and of course how can I realize a digital filter? one more question.... what are...
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    divider for PLL based frequency synthesizer

    Hi, I'm simulating a PLL based frequency synthesizer using dual modulus prescaler. I know I should divide output with MP+A while A is programmable down counter. The theory is "N=A(P+1)+(M-A)P=MP+A". I found a control logic as below to realize this. My question is how to implement "+A" in...
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    clock duty cycle conversion

    In order to use an ordinary frequency doubler, I use an xor gate as below. But one problem I find is the delay cell. This cell must have 50% or 25% delay of input signal period. Can I use shift register as a delay cell?
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    clock duty cycle conversion

    I think that use of duty cycle correction circuit(DCC) is critical. But one can find this helpful if I use DFF for divided by 2 so that I have 50% duty cycle and then utilizing frequency doubler to reach the original frequency. If there is any other key point please tell me? thanks
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    clock duty cycle conversion

    Unfortunately I'm not allowed to use analog tricks. But I think there is a solution with xor. I will tell you when ever I reach to a digital solution. Thanks to all
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