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Recent content by alexs

  1. A

    MIM capacitance parasitics

    Hi sat, I agree with you that such large value of parasitic capacitor is due to counting of MIM capacitor during extraction. I have performed check that you recommend but it is difficult to me to interpret the results: Check A: I find the capgen part in RCX log file but cannot find any layer...
  2. A

    MIM capacitance parasitics

    I also agree that this value is too large. I check the value of parasitic capacitance for the nets using Virtuoso all nets table (from Parasitics menu). If I decrease the value of MIM capacitor (therefore the area and pcapacitance) I see the pcapacitace is decreased in given table. Is this...
  3. A

    MIM capacitance parasitics

    Hi, I am designing layout of fully differential opamp using UMC 0.18 technology. For compensation purposes my op amp contains MIM 8pF capacitance. After layout RC parasitics extraction (I used Assura for this purpose) I have found that parasitic capacitances for both net connected to given MIM...
  4. A

    question regarding correct biasing of opamp input pins

    Re: op amp biasing I am studying design of fully differential OTA for active filter application. OTA is simple two stage (see picture) and CMFB circuit. What is possible solutions for biasing such type of OTA?
  5. A

    question regarding correct biasing of opamp input pins

    Re: op amp biasing So I can use exteranl biasing at input and DC coupled next stages to share biasing, is this right?
  6. A

    question regarding correct biasing of opamp input pins

    Re: op amp biasing LvW, For me DC gain is not important.
  7. A

    question regarding correct biasing of opamp input pins

    Re: op amp biasing So if I understand correctly I can also use opamp without selfbiasing circuit. For example I have cascade of two opamps (without selfbiasing), can I use one source of biasing (current mirror or voltage divider) at the input differential pair of first opamp to bias all opamp...
  8. A

    question regarding correct biasing of opamp input pins

    op amp biasing Hi all and good day! I have question regarding correct biasing of opamp input pins. I am studying desing of fully differential opamp and have misunderstanding of correct biasing procedure. As I understand from books opamp is self powered and biased element so it not need biasing...
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