Study And Design Of A Low-Voltage, Low-Power CMOS Intergrated Op Amps

In recent years,more and more electron with battery supply are widely used,which cries for adopting low voltage analog circuits to reduce power consumption,low voltage,low power analog circuit design techniques are becoming research hotspot.In the analog IC,one of the typical circuits is operational amplifier.Therefore,the design of low-voltage and low-voltage operational amplifier is very necessary.while realizing low-voltage and low-power,it must be noticed for the implementing of the main function of the circuit.Because the low supply voltage affects performances of circuits,it is not very good for just implementing low-voltage and low power but not implementing the good performances.The thesis has done the widespread investigation and study to the domestic and foreign's technologies of analogy low voltage and low power,and analyzes the principles of work,merts and shortcomings of these technologies,based on the absorption of these technologies,it designs a 1.5V low power rail-to-rail CMOS operational amplifier.When designing input stage,in order to enable the input common mode voltage range to achieve rail-to-rail,it does not use the traditional differential input pair,but use the NMOS tube and the PMOS tube parallel supplementary differential input pair to the structure,and uses the proportional current mirror technology to realize the constant transconductance of input stage.In the middle gain stage design,the current mirror load does not use the traditional standard cascode structure,but uses the low voltage,wide-swing casecode structure which is suitable to work in low voltage.When designing output stage,in order to enhance the efficiency,it uses the push-pull common source stage amplifier as the output stage,the output voltage swing basically reached rail-to-rail.The thesis changes the design of the traditional normal source based on the operational amplifier,uses the differential amplifier with current mirror load to design a normal current source.The normal current source provides the stable bias current and the bias voltage to the operational amplifier,so the stability of operational amplifier is guaranteed.The thesis uses the Miller compensate technology with a adjusting zero resistance to compensate the operational amplifier.The circuit design is realized in 0.35μm CMOS technology and HSPICE...