模拟基准源电路小结(一、温度补偿)060907

SummaryandDiscussionofReferenceCircuits卢杨PMGroup2006-09-07Nowadays，theresearchinterestsofreferencecircuits:1、LowTemperatureCoefficient（高的温度稳定性）2、HighPSRR（高的电源稳定性）3、LowVoltage&LowPower（低压低功耗）4、NewReferenceStructureExceptClassicalBandgapReference（新结构）一、LowTemperatureCoefficientLowTemperatureCoefficient&HighStabilityofTemperatureMethodsofCurvaturecorrection&TemperatureCompensationAchieve:By:Whatistraditionalbandgapreference?Theprinciple:Thecircuit:MethodsofTemperatureCompensation1.1MethodofResistorTrimming1.2MethodofSummingCurrentswithnegativeandpositiveTC1.3OtherMethodsandCircuitStructures

1.1MethodofResistorTrimming(example1)Theamplifierenforces:V1=V2When:R2A1=R2B1,R2A2=R2B2Then:V3=V4Advantage&Disadvantage(example1)

1、Justdealingwithlineartemperaturecompensation,donothingabouthigh-orderterms;2、Relativeroughnessmathematicsmodeling.

So,notsogoodperformance…….1.1MethodofResistorTrimming(example2)R1、R2、R4：HpolyRR3：P-DiffSteps：1、VaryingR3/R1forhigh-ordertemperaturetrimming；2、VaryingR2/R1forlineartemperaturetrimming。Advantage&Disadvantage(example2)

1、Havingconsideredthehigh-ordertemperaturecompensation,soitisalittlebetterthanexample1;

2、But,unfortunately,itusesDiffusedResistors.

Because………So,sogoodperformanceinsacrificeof…….1.2MethodofSummingCurrentswithnegativeandpositiveTCs

1、GetIPTATfromtraditional

bandgapreferencecircuit;2、Designnewcircuitstructurestogetone(orseveral)currentwithnegativeTC(temperaturecoefficient)；

3、GetIVbe;4、Docurrentsummingtothesethreekindsofcurrent.Bycircuitchanging:a3=0Bycircuitgenerating:Bycurrentsumming…….1.3OtherMethodsandCircuitStructures1.3.1、Themethodoffeedbacksystem:Reference