Using Feedback Technology Of Wideband MMIC Digital Attenuator
Chengpeng Liu, Xiaojia Feng · Advances in economics, business and management research/Advances in Economics, Business and Management Research · 2015
This paper mainly introduces the Wideband MMIC digital attenuator by using feedback technology.Firstly, the theories of basic GaAs digital attenuator MMIC's configurations are searched.Secondly, using feedback technology and normal configuration are contrasted, subsequently, appropriate topology is selected for each stage.This attenuator has been realized by 0.5µm GaAs pHEMT process.Simulation results of the digital attenuator has 0.5dB resolution and 31.5dBdynamic attenuation range, over DC~6GHz, high attenuation accuracy is less than ±0.7dB,Input Voltage Standing Wave Ratio(VSWR IN ) was less than 1.2 and Output Voltage Standing Wave Ratio(VSWR OUT ) was less than 1.3 for all attenuation states, insertion loss is less than 3.2dB.