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Recent content by yushen_yang

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    Does anyone know what is the real gm equation in BSIM4 model

    Re: Does anyone know what is the real gm equation in BSIM4 m **broken link removed** Try this
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    Problem with using imaginary current method

    Hi all, I am using the imaginary current mehtod to test the input capacitance. Vtest Vnd gnd sin(0.5V 0.5V 100Meg) .print cap = 'IM(Vtest)/(2*pi*f*Vac) where f=100Meg and Vac=1v Is there any thing wrong about this equation, I'm stuck here for a while. thx
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    Testing problem of dynamic specification in pipeline ADC

    Hi All I am testing dynamic spec of pipeline ADC such as SNR, ENOB. I use window sampling method to measure frequency domain. however, by using different window( hanning, hamming, backham,) the noise floors are diffierent. Does anyone know how to calcaculate noise floor in these cases? And...
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    ADC characterization in simulation stage

    Re: ADC Characterisation Try the application notes AN283,AN641,AN729,and AN728 in Maxim website www.maxim-ic.com Yu-Shen
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    Q about testing ADC in simulation level

    Hi All, For testing 10bits ADC in simulation level, I extract data from Hspice and import the data into Matlab to do FFT. Suppose my input is 2.11MHz and sampling rate is 10MHz, I use matlab codes to DAC in order to get the ideal analog output and then test SNR, ENOB, THD. The problem is...
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    hspice and awaves problem

    Sorry, My fault. I only try to click on the plot but not on the x-axis. YuShen
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    hspice and awaves problem

    unfortunately, there's no this option in awaves. This why I try to find command in Hspice YuShen
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    hspice and awaves problem

    awaves x-axis Hi All, I used Hspice to do ac sweep for measuring Op Amp frequency response and plot the result on Awaves. but I have problem to change x-axis form linear scale to log-scale. Is there any control statement I can use to change that. I have search the Hspice manual for several...
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    How to calculate SNR in this case?

    Hi all, I am design a 10bits pipeline ADC and by followingprevious articles I use Matlab to do FFT. But here are the problems I met. fin=100Khz, fs=10Mhz, N=8192(number of data points in FFT), M=83 (integer number of cycles within the sampling window), First I used coherent sampling method...
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    Question about one-stage full differential Op amp

    Hi all, Thanks for those who gave me advice on the topic I posted couple days ago. Unfortunately, my problem is still there. I post my question again and also I upload the schematic and wave picture. Hope it can give you more clearly understand where my problem is. Question as below: I am...
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    question about one-stage full differential Op amp

    Hi all, I am designing a one-stage full differential cascode op amp which are stacked with two pmos and two nmos in each path. the lower nmos pair is the input. and then a extra nmos acting as a current source connects ground and the lower nmos pairs. a pair of pmos triode device are used to...
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