Abstract
This paper mainly introduces the Wideband 5-bit MMIC digital attenuator with high precision. Firstly, the theories of basic GaAs digital attenuator MMICâ??s configurations are searched. Secondly, every possible configuration is 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 0.25dB resolution and 7.75dB dynamic attenuation range, Input Voltage Standing Wave Ratio(VSWRIN) was less than 1.55 and Output Voltage Standing Wave Ratio(VSWROUT) was less than 1.6 for all attenuation states, high attenuation accuracy is less than ±0.26dB; insertion loss is less than 1.3dB; The layout of the digital attenuator with a chip size is 0.93 mmA?1.45 mm
Highlights
MMIC variable attenuators are required in many microwave systems for automatic gain control for receiver and transmitter systems, amplitude weighting for phased array radars and temperature compensation of microwave amplifiers
We describes an Wideband 5-bit MMIC digital attenuator with high precision
The five required attenuation bits are the 0.25dB, 0.5dB, 1dB, 2dB and 4dB, providing a dynamic range from 0.25dB to 7.75dB. the most attenuation of five mainly attenuation states is 4dB, Bridged-Tee attenuator are used for the Wideband 5-bit MMIC digital attenuator
Summary
MMIC variable attenuators are required in many microwave systems for automatic gain control for receiver and transmitter systems, amplitude weighting for phased array radars and temperature compensation of microwave amplifiers. The attenuator has two types of control method, analog attenuator and digital attenuator. Digital attenuators offer better linearity, high power handling, and easy and accurate control of attenuation, So MMIC digital attenuators have gained lots of interest in recent years[5~6]. The requirements of the MMIC digital attenuators to be designed are as following: small size, high attenuation accuracy, low insertion phase shift, high reliability and low cost[7]. We describes an Wideband 5-bit MMIC digital attenuator with high precision. The digital attenuator has obtained excellent performances and implements in 0.5um GaAs pHEMT MMIC
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