The Equivalent Circuit Models And Applications Of Static Induction Transistor

Static induction transistor(SIT)is a three-terminal semiconductor device.SIT has been widely used in frequency,ultrasonic and power source fields because of its fast switching speed,high voltage amplification factor,good linearity and high pressure resistance.In this thesis,an equivalent circuit model of n-channel SIT(N-SIT)has been developed based on the N-SIT developed independently,and has been also simulated in the HSPICE software.The DC and sinusoidal signal characteristics of circuit have been tested.The comparison for equivalent circuit model with measured results has been given,which includes its DC I-V characteristic,sinusoidal output characteristic and amplitude frequency response characteristic.The results show that the equivalent circuit model is in agreement with measured results,which can be used in circuit simulation.Based on equivalent circuit model of N-SIT,the circuit model of p-channel SIT(P-SIT)has been established by changing equation parameters of current source for the demand of complementary push-pull amplifier.The simulation results show that the performance of P-SIT and N-SIT is symmetric.Complementary push-pull amplifier based on N-SIT and P-SIT in pairs has been designed,which eliminates crossover distortion of the class B amplifier,and the undistorted output voltage has been given by simulating in the HSPICE software.Based on the SIT with “Dual-Mode” developed independently,dynamic range and signal processing capacity of the unique device have been studied.Dynamic characteristics of the SIT with “Dual-Mode” at defferent frequencies and amplitudes have been studied by testing the circuit.The results show that input signal without DC bias can be amplified by SIT with “Dual-Mode”.In addition,distortion characteristics of the SIT with “Dual-Mode” have been discussed.