Program-controlled variable five-bit non-reciprocal microwave monolithic integrated attenuator

Abstract

The invention discloses a program-controlled variable five-bit nonreciprocal microwave monolithic integrated attenuator, which consists of an input port standing wave regulation module, a microwave attenuation module, an output port standing wave regulation module and a control module (21), wherein the input port standing wave regulation module is completely symmetrical with the output port standing wave regulation module. The program-controlled variable five-bit nonreciprocal microwave monolithic integrated attenuator has the advantages that: all attenuation networks are connected in parallel, the loss of microwave signals is low; all control switches and all microwave single-pole single-throw switches are realized by adopting small gallium arsenide field effect transistors, and have high switching performance, and the operation bandwidth of the attenuator is wide; an attenuation circuit is connected in parallel with a microwave amplitude balancing circuit, so the amount of attenuation in the whole working band is balanced and flat; attenuation control coding is irregular, and if a certain bit is shifted, results may not be influenced greatly; and a novel structure is introduced to reduce the sensitivity of a process and then the yield of a chip is increased from 60 percent to 80 percent.

Description

technical field [0001] The invention relates to a microwave single-chip integrated circuit, in particular to a program-controlled variable five-bit non-reciprocal microwave single-chip integrated attenuator. Background technique [0002] Digital attenuators are commonly used components in microwave communication systems. A digital attenuator is usually formed by cascading unit attenuation networks with different attenuation quantities, and various attenuation quantities can be realized through the combination of different units, thereby realizing the control and processing of signals. The traditional attenuator uses PIN or GaAs MESFET as the core switch control device. The idea is to achieve unit attenuation by controlling the attenuation network, and then cascade to form the required multi-bit attenuator, and realize the signal through the opening and closing of the switch channel. Attenuation and non-attenuation. And the control code corresponding to the traditional atte...

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Problems solved by technology

And the control code corresponding to the traditional attenuator is a standard binary code. The disadvantages of this attenuator are: (1) When not attenuating, the natural insertion loss of multiple bits is superimposed by multiple bits, resulting in signal loss; (2 ) There is a mismatch between different units, and it is difficult to achieve linear superposition, resulting in low attenuation accuracy; (3) The use of large-size die switches requires high processing accuracy, resulting in low actual yield; (4) Once If a certain bit is shifted, the entire state related to this bit will be shifted, and there is heredity

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