模拟基准源电路小结(一、温度补偿)060907.pptVIP

Summary and Discussion of Reference Circuits 卢杨 PM Group 2006-09-07 Nowadays，the research interests of reference circuits: 1、 Low Temperature Coefficient （高的温度稳定性） 2、 High PSRR （高的电源稳定性） 3、 Low Voltage Low Power （低压低功耗） 4、 New Reference Structure Except Classical Bandgap Reference （新结构） 一、 Low Temperature Coefficient What is traditional bandgap reference? Methods of Temperature Compensation 1.1 Method of Resistor Trimming 1.2 Method of Summing Currents with negative and positive TC 1.3 Other Methods and Circuit Structures 1.1 Method of Resistor Trimming (example 1) Advantage Disadvantage (example 1) Advantage Disadvantage (example 2) 1.2 Method of Summing Currents with negative and positive TCs 1、Get I PTAT from traditional bandgap reference circuit; 2、Design new circuit structures to get one (or several) current with negative TC(temperature coefficient)； 3、Get I Vbe; 4、Do current summing to these three kinds of current. 1.3 Other Methods and Circuit Structures 1.3 Other Methods and Circuit Structures 完了！ 谢谢！ * * Low Temperature Coefficient High Stability of Temperature Methods of Curvature correction Temperature Compensation Achieve: By: The principle: The circuit: The amplifier enforces : V1=V2 When: R2A1=R2B1, R2A2=R2B2 Then: V3=V4 1、 Just dealing with linear temperature compensation, do nothing about high-order terms; 2、Relative roughness mathematics modeling. So, not so good performance……. 1.1 Method of Resistor Trimming (example 2) R1、R2、R4：Hpoly R R3：P-Diff Steps： 1、Varying R3/R1 for high-order temperature trimming； 2、Varying R2/R1 for linear temperature trimming。 1、 Having considered the high-order temperature compensation, so it is a little better than example 1; 2、But, unfortunately, it uses Diffused Resistors. Because……… So, so good performance in sacrifice of……. By circuit changing: a3=0 By circuit generating: By current summing……. 1.3.1、The method of feedback system: Reference gene