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Recent content by bob_lv

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    About single loop multibit delta-sigma modulators

    Re: multi bit quantizer in matlab If you want to get 20.625 divider value, and the DSM is MASH 1-1-1. Then your divider must divide from 16~23. The divider must be a mutimodulus divider. It can be made by a dual-modulus prescaler+P/S Counter or other medthods.
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    Design a fourth-order sigma-delta modulator

    you should do more behavorial level of work
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    Help me with designing multiplexer using SCL

    SCL SCL is sourec coupled logic , which is also called CML (current mode logic). You can serch cml in edaboard.
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    sigma delta modulator: Verilog code to MATLAB?

    sigma delta modulator I think eejli talking about a digital delta-sigma modulator. It may be used in a fractinal-N frequency synthesizer or a DA converter.
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    A little problem about this Matlab code

    y(tr+1:tt) is the transient results. Y is the FFT results of y. Py is actually (abs(Y/(L/2)))^2. 10*log10 turn the unit to the dB
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    sigma delta modulator: Verilog code to MATLAB?

    sigma delta modulator site:edaboard.com See sth about FFT. Just do a FFT to the transient results, you will get the spectrum. Added after 1 minutes: See sth about FFT and window function. Just do a FFT to the transient results, you will get the spectrum.
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    Building an adder with transistors in analog library

    About building an adder If I build a 20-bit adder with transisters in analog library (because I don't have digital library), is it much different from the adder building with digital standard cell? And what should I pay attention to build it? When it is finished, how can I simulate it easily...
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    What is the practical application of PLL?

    PLL application You can use frequency synthesizer(PLL with divider) to get any frequency you want. But crystal oscillator can't do this.
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    Questio about Vo of two capacitors in series

    Two capacitor in series So, you mean, when S2 closed, there is no charge flow from 10V?
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    How to determine the Kvco value of a VCO?

    first, draw the curve frequency vs vin than use calculator to calculate the slope
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    Help about simulation of prescaler!

    Thanks! Are there any other methods? I remember some paper mentioned cascading 3 D-flipflops to form a ring oscillator, I want to know more about this or methods like this.
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    Help about simulation of prescaler!

    How to simualte the maximum working frequency of a prescaler and its power consumption? Thanks!
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    Looking for a PLL AC model

    About PLL AC model... you can simulate the transfer function in matlab or mathcad,etc...
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    Fref of delta-sigma modulator in PLL

    Thanks! I know the PLL Fref is the frequency it works.(The real working frequecny should be the divided vco frequency,right?) I want to know if my Fref is about 20MHz, does it need special adder? Or normal adder can reach it? And how about 4th-order MASH?
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    Fref of delta-sigma modulator in PLL

    A 3-order MASH modulator in fractional-N pll, each stage uses a 20-bit accumulator. How fast can it work? And generally what frequency does it work at? Thanks!
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