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Recent content by twonsr

  1. T

    Increase length and Vth decrease

    Hi All: If mos length increases and Vth will decrease. Why ? Thank you.
  2. T

    Design of Low-voltage, Low-power Operational Amplifier Cells

    Hi all : I have a question from "Design of Low-voltage, Low-power Operational Amplifier Cells" by Ron Hogervorst and Johan H. Huijsing. In page 99, how to derive to get formula 5-17 ? Thank you.
  3. T

    I have a question from Razavi's book.

    in sample mode : the voltage across Cin is Vx. the voltage across CH is Vo. in amplification mode : the voltage across Cin is still Vx. but the voltage across CH is (CHVo + CinVx)/CH Why is the CinVx added ?
  4. T

    I have a question from Razavi's book.

    Hi All : In page 428, line 8, it said "...raising the charge on CH to (CHVo + CinVx)." Why ? I don't understand why the charge on CH is to be raised. how to explain and get this formula ? Thanks
  5. T

    I have a question to get a formula from Razavi's book.

    Hi All : In page 426, Fig. 12.32c , it says that CxVx - (Vout - Vx)Ch = 0 how to derive and get this formula ? Thanks
  6. T

    Explanation of supply voltage range

    Dear all : When I read some datasheet, the specified supply voltage range is "-0.3v to 6v". I don't understand why "-0.3v" is. Could someone tell me about that ? Thanks a lot.
  7. T

    If there are two negative feedback in one circuit

    Hi : please see the circuit, there are 2 negative feedback, but just one will work. How to caculate or analysis to find the work one ? Thanks
  8. T

    If there are two negative feedback in one circuit

    Hi: If there are two negative feedback in one circuit, and the two feedback are not independent, how should we decide which one will survive ? compare the loop gain AB or just compare the feedback factor B ? Thank you.
  9. T

    Questions about plasma in ICs

    All : About the topic of ESD, why does the plasma occur when snap-back ? Isn't the plasma a kind of partially ionized gas ? Why is there gas inside IC ?? TKS
  10. T

    Bandgap Feedback Polarity

    But why is it "2" , why not 3 or 4 , etc ? Any theory for this ?
  11. T

    Bandgap Feedback Polarity

    feedback polarity Hi all : I have a problem when I read razavi's analog circuit book P.389. It said "to ensure an overall negative feedback, Bp must be less than Bn, preferably by roughly a factor of two......" What is "a factor of two" ? Does it mean Bn/Bp must be larger than 2 ? TKS
  12. T

    Put resistor at base of BJT of BANDGAP circuit

    But why not put just one resistor from base to ground ? It put two base resistors...
  13. T

    Put resistor at base of BJT of BANDGAP circuit

    All : I upload the circuit as the attached file. I am happy to share your idea.
  14. T

    Put resistor at base of BJT of BANDGAP circuit

    beta of bjt in bandgap circuit But ... some guys revrse some ICs and find that. There must be some purpose.
  15. T

    Put resistor at base of BJT of BANDGAP circuit

    bjt without base resistor Hi All : I have a question... In a bandgap circuit , if put 2 resistors (RB1 ,RB2)at base for those 2 BJTs, what benefits can the circuit get ? Thanks a lot.
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