Multi-level Digital Step Attenuator with Hybrid T-Pi Circuit
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Solution Overview
Problem
Conventional digital step attenuators require multiple stages to achieve wide-range and high-resolution signal attenuation, leading to complex LC matching networks and increased circuit complexity.
Innovation Solution
A multi-level digital step attenuator with a hybrid attenuation circuit and a single bypass switch, controlled by a 2-bit signal, which switches between T-type and Pi-type structures to provide multiple levels of signal attenuation, reducing the number of stages required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple stages of digital step attenuators are coupled in series to achieve wide-range and high-resolution attenuation, then the attenuation range and resolution are improved, but the device complexity and circuit area increase due to more complex LC matching networks
Solution Approach 1:
The attenuator is divided into multiple stages, each providing a specific attenuation range. The first stage provides coarse attenuation (0-15 dB) while the second stage provides fine attenuation (0-3 dB), enabling wide-range high-resolution attenuation with fewer total stages compared to a uniform design
Solution Approach 2:
The patent transitions from a conventional single-mode attenuator design to a multi-level attenuator that operates in multiple modes (bypass mode, first attenuation mode, second attenuation mode). This dimensional change in operational states allows achieving 19 attenuation levels with only 2 stages instead of requiring more stages for equivalent resolution
2Measurement precision
If multiple stages of digital step attenuators are coupled in series to achieve wide-range and high-resolution attenuation, then the attenuation range and resolution are improved, but the circuit area increases due to more complex LC matching networks
Solution Approach 1:
The attenuator is divided into multiple stages, each providing a specific attenuation range. The first stage provides coarse attenuation (0-15 dB) while the second stage provides fine attenuation (0-3 dB), enabling wide-range high-resolution attenuation with fewer total stages compared to a uniform design
Solution Approach 2:
The patent transitions from a conventional single-mode attenuator design to a multi-level attenuator that operates in multiple modes (bypass mode, first attenuation mode, second attenuation mode). This dimensional change in operational states allows achieving 19 attenuation levels with only 2 stages instead of requiring more stages for equivalent resolution
3Measurement precision
If multiple stages of digital step attenuators are coupled in series to achieve wide-range and high-resolution attenuation, then the attenuation range and resolution are improved, but the insertion loss increases
Solution Approach 1:
The attenuator is divided into multiple stages, each providing a specific attenuation range. The first stage provides coarse attenuation (0-15 dB) while the second stage provides fine attenuation (0-3 dB), enabling wide-range high-resolution attenuation with fewer total stages compared to a uniform design
Solution Approach 2:
The patent transitions from a conventional single-mode attenuator design to a multi-level attenuator that operates in multiple modes (bypass mode, first attenuation mode, second attenuation mode). This dimensional change in operational states allows achieving 19 attenuation levels with only 2 stages instead of requiring more stages for equivalent resolution
Data Source
AI summary
A multi-level digital step attenuator (DSA) with a hybrid attenuation circuit is shown. The hybrid attenuation circuit is coupled between an input node and an output node of the multi-level DSA. The bypass switch of the multi-level DSA is controlled to provide a bypass path between the input node and the output node of the of the multi-level DSA when the hybrid attenuation circuit is in a disabled state. In the first active state, the hybrid attenuation circuit is switched to form a T-type structure to provide a first amount of signal attenuation. In the second active state, the hybrid attenuation circuit is switched to form a Pi-type structure to provide a second amount of signal attenuation.