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Recent content by steven_jun

  1. S

    how to change BJT voltage limiter to mos voltage limiter in ESD protection

    i still do not know how i could change bjt to mos(pmos or nmos) to realize the same function. in my application ,the supply is produced by internal circuit and is bonded to pin of package. the supply produced by circuit is pulse voltage, so i can not use RC-CLAMP as ESD protection. i...
  2. S

    how to change BJT voltage limiter to mos voltage limiter in ESD protection

    hi , in ESD protection , i meet some trouble. i have a circuit consisted with bjts to limit the value of the supply voltage , but now i must use cmos technology to realize the same function of the voltage limiter in ESD protection . diode and resistor can be still used. what...
  3. S

    how to calculate S11 if z0 is not equal 50 ohm

    if z0 is not equal 50 ohm,z0=30-2j,zin=70-6j, is the equation s11=(zin-z0)/(zin+z0) still right?? please help me ,thanks
  4. S

    help : i dont know how work one subcircuit in low noise amplifier with bipoar process

    i think : because R13=2*R0 and the IB(Q16)=IB(Q18)=0.5*I0/(1+beta(Q16),so the VBE(DZ17)=VBE(Q0)+0.5*IB(Q16)*R13. then the collector current of Q(DZ17) is determinated. do you think ? thanks !
  5. S

    help : i dont know how work one subcircuit in low noise amplifier with bipoar process

    thank you ,my friends , I have a problem on this circuit. R13=8*R R14=2R, R0=4R , i dont know how to determine the collector current of QZ17,because i dont know the drain voltage of the nmos NM0
  6. S

    help : i dont know how work one subcircuit in low noise amplifier with bipoar process

    help i dont know how work one subcircuit in low noise amplifier with bipolar process in the analysis low noise amplifier ,i dont konw the function of one subcuit ,the process is bipolar can you tell me the function or some relevant information or document
  7. S

    how to simulate active polyphase filter frequency response by spectre in ac simulatio

    thank pancho_hideboo i try it,but the function complex dont support and i cant not find it in the calulator the message is *Error* ("complex" 3 t nil ("*Error* complex: argument #1 should be a number (type template = \"n\")" drwave:92266632))
  8. S

    how to simulate active polyphase filter frequency response by spectre in ac simulatio

    Dear i dont know how to simulate active polyphase filter frequency response by spectre at ac simulation i add the simulus as follow : V1 Iin+ 0 1V ac 200m 0 V2 Iin- 0 1V ac 200m 180 V3 Qin+ 0...
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