High Power Gain Transconductance Of Operational Amplifier Design Design And The Design Application In The Filter

With the rapid development of electronic technology, low power, highperformance has become the electronic products, especially the competitive index ofthe portable electronic products, the operational transconductance amplifier (OTA) as acommon module has been widely used to drive a large capacitive load circuit, such asthe oscillation, sampled data system, and the LDOs, DC-DC error amplifier. Thesesystems require OTA design should have low static power consumption and high-speed response. However, the classic structure of the amplifier, because of its tailcurrent is fixed, it is difficult to take into account to meet the requirements of the statichigh-speed low-power high-gain and large signal-driven, low-power and high-speedrequirements are contradictory. Therefore, the design of high gain, low powerconsumption, slew rate operational transconductance amplifier has become a keytechnology for integrated circuits.This paper systematically summarizes the domestic and foreign operationaltransconductance amplifier research and development dynamic, detailed introductionMOS tube integrated circuit principle, operational transconductance amplifier OTAcircuit basic working principle, through the classical OTA circuit model circuitstructure, according to the adaptive tail current technology and current mirror shunttechnology to design a new OTA operational transconductance amplifier. This designuses the Wuxi Huarun Hua company0.5um DPTM mixed signal design process. Themode selection circuit level1.2V, the load capacitance CL with30pF. Draw a new OTAcircuit diagram, through HSPICE on the classic OTA circuit and improved OTA circuitsimulation, the simulation results show that the improved OTA circuit low frequencygain of62.4dB, low bandwidth1.623MHZ, large signal slew rate22.1V/us, layout areais0.03mm~2. Both the static and dynamic response of low power consumptionperformance requirements.In the second part is the design of the new OTA circuit is applied to the design of OTA-C filters, based on the classic fully integrated OTA-C active filter design method,which is based on signal flow chart method and cascade method design of two orderlow pass filter and the five order low-pass filter, the design of embedded OTAoperational transconductance amplifier, through the PSPICE simulation, design right.It proposes a method to realize the arbitrary order fully integrated filter design method,the design of embedded OTA operational transconductance amplifier, draw the fourorder band pass filter circuit diagram, and the PSPICE simulation, the simulationresults show that the filter performance indicators have reached the designrequirements.