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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,折叠式级联运放的仿真,折叠式级联运放的仿真,The Typical Performance of Op-Amp,Open-Loop Differential Gain(A,V,),Common-mode Rejection Ratio(CMRR),Power Signal Rejection Ratio(PSRR),Phase Margin(PM),Input Common Mode Range,(ICMR),Output Swing Range,(OSR),Input/Output Impedance(C,IN,/R,OUT,),Slew Rate,Noise,The Typical Performance of Op-,The Schematic of Folded Cascode Op-Amp,In order to decease the power,Consumption,I,BIAS,is only 30nA.,The Schematic of Folded Cascod,Create Schematic and Symbol in Spectre,To create a symbol of a schematic:,From Design-Create Cellview-From Cellview,Create Schematic and Symbol in,Open-Loop Differential Gain,DC Sweep,V,P,-,V,N,(large signal),AC Sweep,V,P,-,V,N,with fixed frequency(small signal),Two methods of simulating Open-Loop Differential Gain,is available in ADE(Analog Design Environment),Open-Loop Differential Gain DC,Test-Bench of Open-Loop Differential Gain,(method 1),DC Sweep,V,P,-,V,N,(large signal),In this method,V,P,=V,CM_IN,+x,and V,N,=V,CM_IN,-x,Where,V,CM_IN,is the common voltage,x is a design variables.,Setup V,N,Setup V,P,Test-Bench of Open-Loop Differ,ADE of Open-Loop Differential Gain,(method 1),To add a model for the simulation,From ADE-Setup-Model libraries,To create a DC Sweep,From ADE-Analyses-Choose-DC,ADE of Open-Loop Differential,Waveform of Open-Loop Differential Gain,(method 1),Where,Differential Gain is 71.56dB,To obtain V,COM_OUT,From Calculator-,Special Functions-Value,V,OUT,-,V,COM_OUT,To obtain DC gain,From Calculator-,Special Functions-deriv,Waveform of Open-Loop Differen,Test-Bench of Open-Loop Differential Gain,(method 2),AC Sweep,V,P,-,V,N,with fixed frequency,Setup V,N,Setup V,P,In this method,V,P,=V,CM_IN,+x+V,AC,and V,N,=V,CM_IN,Where,V,CM_IN,is the input common voltage,x is a design variables,V,AC,is a AC voltage for AC Sweep.,Test-Bench of Open-Loop Differ,ADE of Open-Loop Differential Gain,(method 2),To add a model for the simulation,From ADE-Setup-Model libraries,To create a AC Sweep,From ADE-Analyses-Choose-AC,Fixed,Freq,ADE of Open-Loop Differential,Waveform of Open-Loop Differential Gain,(method 2),Differential Gain is 65.56dB,The results of the two methods are different,In fact,method 1 is more accurate for DC gain.,Waveform of Open-Loop Differen,Common-mode Rejection Ratio,You can get detail illustration from,“,CMOS Analog,Circuit Design,”,Phillip E.Allen,Oxford University Press,Inc.,Common-mode Rejection Ratio Yo,Test-Bench of CMRR,Where,V,COM_IN,is the input common voltage,V,AC,is a AC voltage for AC Sweep.,Test-Bench of CMRRWhere,VCOM,ADE of CMRR,To add a model for the simulation,From ADE-Setup-Model libraries,To create a AC Sweep,From ADE-Analyses-Choose-AC,ADE of CMRRTo add a model for,Waveform of CMRR,1/CMRR,CMRR,To obtain CMRR:,From Calculator-1/x,1/CMRR and CMRR plot directly.,Waveform of CMRR1/CMRRCMRRTo o,Waveform of CMRR,To obtain magnitude Plot of CMRR:From Calculator-dB20,Frequency response of CMRR,The CMRR is 72.14dB at low frequency range.,To obtain phase Plot of CMRR:,From Calculator-phase,Waveform of CMRRTo obtain magn,Power Signal Rejection Ratio,You can get detail illustration from,“,CMOS Analog,Circuit Design,”,Phillip E.Allen,Oxford University Press,Inc.,Power Signal Rejection Ratio Y,Test-Bench of PSRR,Where,V,AC,is a AC voltage for AC Sweep,and V,DC,is a DC voltage,Test-Bench of PSRRWhere,VAC,ADE of PSRR,To add a model for the simulation,From ADE-Setup-Model libraries,To create a AC Sweep,From ADE-Analyses-Choose-AC,ADE of PSRRTo add a model for,Waveform of PSRR,1/PSRR,PSRR,To obtain CMRR:,From Calculator-1/x,1/PSRR and PSRR plot directly.,Waveform of PSRR1/PSRRPSRRTo o,Waveform of PSRR,To obtain magnitude Plot of PSRR:From Calculator-dB20,Frequency response of PSRR,The CMRR is 79.17dB at low frequency range.,To obtain phase Plot of PSRR:,From Calculator-phase,Waveform of PSRRTo obtain magn,Phase Margin of Open-loop frequency Response,Where,V,CM_IN,is the input common voltage,V,AC,is a AC voltage for AC Sweep,And C,L,is the loading capacitor.,Phase Margin of Open-loop freq,Test-Bench of PM,V,CM_IN,V,AC,The dominant pole is controlled by C,L,in folded Cascode op amp.,Test-Bench of PMVCM_INVACThe d,ADE of PM,To add a model for the simulation,From ADE-Setup-Model libraries,To create a AC Sweep,From ADE-Analyses-Choose-AC,ADE of PMTo add a model for th,Waveform of PM,To obtain magnitude Plot of open-loop:From Calculator-dB20,open-loop frequency response,The PM is 74,o,when C,L,is 5pf.,To obtain phase Plot of open-loop:,From Calculator-phase,There have two poles in open-loop frequency,response,one is the dominant pole of output net,and the another is the mirror pole,caused,by,active current mirror.,Waveform of PMTo obtain magnit,Input Common-mode Range,Where,x is a design variables and C,L,is the loading capacitor.,Input Common-mode RangeWhere,Test-Bench of ICMR,Test-Bench of ICMR,ADE of ICMR,To add a model for the simulation,From ADE-Setup-Model libraries,To create a DC Sweep,From ADE-Anal
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