Abstract

This paper mainly introduces the Wideband MMIC digital attenuator by using feedback tec hnology. 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 31.5dB dynamic a ttenuation range, over DC~6GHz, high attenuation accuracy is less than ±0.7dB, Input Voltage S tanding Wave Ratio(VSWRIN) was less than 1.2 and Output Voltage Standing Wave R atio(VSWROUT) was less than 1.3 for all attenuation states, insertion loss is less than 3.2dB.

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