Design Of The DUT's Power Supply Of Integrated Circuit Test System

Integrated circuit testing runs through the entire industrial chain and application links of integrated circuit design,manufacturing,packaging and testing.Generally,special integrated circuit automatic test equipment(Automatic Test Equipment,ATE)is used for testing,while the power supply module of the device under test(DPS: Device Power)Supply)is a basic functional module of ATE,which is the the power of device under test(DUT: Device Under Test).With the development of integrated circuits,higher requirements have been proposed on DPS modules in terms of output accuracy,ripple,dynamic response characteristics,and power conversion efficiency.The DPS module developed in this subject can achieve an output voltage range of ± 20 V and a current range of ± 6A,which solves the problems of rapid response under high power load conditions,accurate control of voltage and current,and efficient power conversion.The main research contents include:1.Studying the precise control method : the ARM controller is the core,and the input of the power amplifier is adjusted through a DAC to realize the adjustable power supply output.In order to achieve fast response and precise control of output power.Using voltage and current double closed-loop control.When collecting the output voltage,the four-wire Kelvin collection is used to eliminate the error caused by the additional electronics and lead resistance between the output of the DPS module and the DUT of the device under test.For current collection,the use of sub-collection to improve the measurement accuracy.At the same time,the Butterworth active filter and LC passive filter are used to decrease the output power ripple.2.Researching on the method of high-efficiency power conversion: According to the characteristics of linear voltage stabilization and switching power supply,a two-stage voltage stabilization method of four-switch pre-regulation plus power amplification is proposed.A four-switch buck-boost circuit is used to reduce the power dissipation of the power amplifier under large loads.At the same time,in order to reduce the turn-on and turn-off losses of the power tube in the four-switch tube buck-boost circuit,a ZVS soft switching technology is proposed.3.Fast response of power supply under heavy load: obtain the equivalent transfer function according to the hardware circuit of the DPS module and use Simulink to establish its simulation model.Using matlab tools to analyze the open-loop frequency response characteristics of the DPS module,and design a compensation controller to improve the system's phase margin and crossover frequency.Firstly,the compensation controller based on the conventional PID control is designed in combination with the characteristics of the incremental PID control algorithm and the defects of the conventional PID control algorithm are explained.On this basis,the design method of adaptive PID controller based on neural network is discussed.The characteristics of BP back propagation neural network and RBF neural network are studied,and the adaptive PID control algorithm of RBF neural network with identification is been designed.The test results show that the DPS module developed in this project achieves precise control of the output voltage and current,and the ripple voltage is ?20mVpp,which meets the requirements of most integrated circuit tests.