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Recent content by TiwstedNeurons

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    sigma delta ADC simulation

    If you want to do system level sim, you can try MATLAB. For hspice sim, you can substitude the digital gates with verilog models.
  2. T

    how to get waveform from AWD or Wavescan using ocean

    Commands you can use: openResults selcetResult ocnPrint For example: openResults( "./simulation/opamp/spectre/schematic/psf" ) selectResult( ’tran ) ocnPrint( v( "/net56" ) )
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    1st order Delta-Sigma ADC for Temperature compensation

    Hi, all For temperature compensation, if using 1st order DSM to quantize a PTAT voltage, reference is from BG, there should be an idle tone problem, since the PTAT voltage is almost close to DC. If it is true, is there anyway can solve the problem? is it too much to use dither here? The order...
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    Spike at switch tansition

    Like what raduga_in mentioned, the Cgs/Cgd can introduce the clk feedthrough, that's why if you decrease the L, Cgs/Cgd decrease correspondingly. So dummy transistor can absorb part of the charge injection and down play the clk feedthrough if my understanding is correct.
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    Correlated Double Sampling(CDS) in sigma-delta ADC

    adc with correlated double sampling Hi, Gingerjiang: There are several papers claim the input parasitic capacitors can seriously degrade the low-frequency noise performance in CDS. If you are interested in, I can forward those papers to you. I'm dealing with a high precision Mash now and...
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    Correlated Double Sampling(CDS) in sigma-delta ADC

    correlated double sampling integrator Thanks,GingerJiang. What if the input parasitic capacitance of the opamp is considerably large? Have you ever done any simulation to explore the noise spectrum w/ CDS in transistor level? I want to plug the noise spectrum in the SIMULINK SD Toolbox...
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    Correlated Double Sampling(CDS) in sigma-delta ADC

    correlated double sampling Hi, all I noticed for some SD ADC designs, ppl use CDS to decrease integrator leakage and flicker noise. For those of designs that circuit noises are the dominant noise sources (i.e. quantization noise is not so obvious), how can I model flicker noise and white noise...
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    MosCap realized by NMOS and by PMOS

    Re: MosCap How about the bias voltage, frequency response? thx
  9. T

    MosCap realized by NMOS and by PMOS

    MosCap Hi,Everyone We can use mosfet as a capacitor by connecting the s/d/bulk together as one node and gate as another node. Then,here is a question: what is the difference of the moscap realized by NMOS and the moscap realized by PMOS? thx
  10. T

    Help:how to evaluate the performance of SHA in ADC?

    Hi,Simon110 For a 10bit 80M adc. How about if I caculate the settling time limitation in this way(assume half-cycle ): 2^10=1024 ---> 1/(2fs)<7tau -----> tau< 1/(14fs) ------> tau< 3.57 ns So would you please let me know how you get 5.5 ns? thx
  11. T

    layout of resistors and capacitors

    Hi,Tianlei Why should Res and Caps be above well if the circuit is noise sensitive? thx
  12. T

    Differences between Lateral and Vertical BJTs

    Width of the base region should be different. Normally, the vertical BJT has narrower base region (results in bigger β if the doping concentrations keep same on both sides of base and emitter). Please correct me if I'm wrong.
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    +2.5/-2.5 power supply from a 9V battery

    Hi,everyone I'm trying to get a +2.5/-2.5 power supply from a 9V battery. But I have no idea where I should begin with. I tried to check different regulators from Digikey and totally got lost. Is there anybody can help me? thx :cry:
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    How to measure input referred noise using spectrum analyzer?

    measure input referred noise fft Hi, dear everyone I have an amplifier and try to measure its input referred noise. The setup should be: ground the input pair, power the circuit and measure the output using spectrum analyzer. Here are the questions: 1. How does the spectrum analyzer deal with...
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    How to eliminate noise in MOSFET?

    Re: NOISE in MOSFET? It is hard to eliminate the flicker noise in low frequency applications. But some people believe that PMOS has lower flicker noise than NMOS. As the transistor dimension decreasing, this advantage of PMOS become not so obvious.
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