Tolerance Analysis Of PIN Tube Voltage Controlled Attenuator Based On ADS

With the development of wireless communication technology,base station transmit power must be able to be controlled dynamically and rapidly due to the requirements of mobile communication system on the power level of base station and the requirement of temperature and different device batch gain compensation.PIN diodes have a special feature that changes the impedance at the radio frequency by changing the bias current.Thus,PIN diodes are a very suitable element for variable attenuator designs in the microwave field.Using a 3dB bridge as a balanced structure of input and output coupling elements,a PIN diode adjustable attenuator with good return loss and high dynamic range can be generated.The main work of this thesis is to face the problem of reliability and quality of the products in the production line,because the related base station products frequently stop producing because of the attenuation precision of the PIN tube voltage-controlled attenuator.Based on the above problems encountered frequent dilemma,this thesis through the PIN tube works,as well as in the application of voltage-controlled attenuator,expand on the PIN tube voltage-controlled attenuator theoretical deduction.Then,the ADS simulation tool was used to simulate and analyze the working principle of the PIN tube voltage-controlled attenuator.By setting up the tolerance analysis model,the sensitivity analysis(SA),the design of experiments(DOE)and the Monte Carlo analysis(MCA)were used to analyze the tolerance of the PIN tube attenuator in each temperature environment(high temperature/normal temperature/low temperature),to explore the fundamental problem of the circuit.In this thesis,the MCA simulation is used to simulate the uniformity of the impedance of the PIN tube itself and feedback to the PIN tube supplier.From the design point of view of the PIN tube impedance accuracy to avoid temperature under-power and high temperature over-power alarm problem,reduce the channel gain of the discrete,batch fluctuations.Which solves the problems in practical engineering production and application.At the end of this thesis,a new low cost and large dynamic PIN attenuator is proposed,and the simulation and practical test and analysis are done.The designed sample has excellent performance and has good engineering application value.