Program-controlled variable 5-bit reciprocal microwave monolithic integrated attenuator

Abstract

The invention discloses a program-controlled variable 5-bit reciprocal microwave monolithic integrated attenuator. The program-controlled variable 5-bit reciprocal microwave monolithic integrated attenuator comprises an input port standing wave adjusting module, a microwave attenuating module, an output port standing adjusting module and a control module (27), wherein the input port standing wave adjusting module is completely symmetrical to the output port standing wave adjusting module. The program-controlled variable 5-bit reciprocal microwave monolithic integrated attenuator has the following advantages: the attenuator has very small microwave signal loss because all of attenuation networks are connected in parallel; all of control switches and microwave single-pole single-throw switches have excellent switching performance by adopting small GaAs field effect transistors, and the attenuator has wide working bandwidth; the attenuating circuit is connected with a microwave amplitude balancing circuit in parallel, so that the attenuation in the whole working frequency band is flat and balance; attenuation control codes are irregular so as to obviate large influences on the result when a certain bit offsets; and the introduction of the novel structure can lower the sensitivity to the process, thereby improving the chip yield from 60% to 80%.

Description

technical field [0001] The invention relates to a microwave monolithic integrated circuit, in particular to a program-controlled variable five-bit reciprocal microwave monolithic 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 attenuator...

AI Technical Summary

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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