Ultra-wideband amplitude-phase compensation digital switch attenuator circuit

Abstract

The invention discloses an ultra-wideband amplitude-phase compensation digital attenuator circuit, the circuit is formed by cascading n attenuation units through inductance matching, the n attenuationunits adopt any one or more of a simplified T-type circuit, a bridge-T topology with a compensation structure, and a pi-type topology with a phase compensation structure. The circuit is simple in topological structure, has a phase compensation structure, can realize an ultra-wideband working range, has the characteristics of low phase error, low insertion loss and high attenuation precision, andcan be produced on a large scale by adopting a microwave monolithic integrated circuit process technology.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuits, in particular to an ultra-wideband amplitude and phase compensation digital switch attenuator circuit. Background technique [0002] The attenuator is one of the key components of wireless communication, phased array radar and instrumentation systems. Its main function is to provide amplitude control to achieve the purpose of linearly adjusting the gain and increasing the dynamic range. In the prior art, most step attenuators rely on three basic topological types: π-type attenuator, T-type attenuator, and bridge-T-type attenuator. In these designs, whether the signal is bypassed or attenuated is determined by the operating state of the switching transistors of the attenuating unit, so these types of attenuators are highly dependent on the performance of the switching transistors, but the parasitic parameters of the transistors often make additional phase shifts in the attenuatin...

AI Technical Summary

Problems solved by technology

In these designs, whether the signal is bypassed or attenuated is determined by the operating state of the switching transistors of the attenuating unit, so these types of attenuators are highly dependent on the performance of the switching transistors, but the parasitic parameters of the transistors often make additional phase shifts in the attenuating state become larger, causing the attenuator to introduce unwanted phase fluctuations during use

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