Single-Stage Differential Converter With Passive Resistive Network
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Solution Overview
Problem
Existing high-speed mixed signal integrated circuit designs face challenges in efficiently converting full-swing single-ended signals to low-swing differential signals, often requiring multiple stages and active circuit components that introduce signal distortion and complexity.
Innovation Solution
A single-stage converter using a passive network of resistive elements, including resistors and MOS devices operating in a linear region, with adjustable current sources to define the common mode and differential amplitude of the low-swing differential signal, allowing for independent adjustment of common mode without affecting the output swing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stages and active circuit components are used for signal conversion, then the conversion functionality is achieved, but signal distortion and design complexity increase
Solution Approach 1:
The converter is divided into distinct functional blocks: a first resistive element connected to the single-ended input, a second resistive element connected to the differential output, and a current source coupled to the second resistive element. This segmentation allows each component to perform a specific function while maintaining overall simplicity and reducing signal distortion.
2Reliability
If multiple stages are used for signal conversion, then the conversion is achieved, but the number of circuit components increases
Solution Approach 1:
The patent merges the functions of multiple conversion stages into a single-stage architecture where the first resistive element, second resistive element, and current source work together in one integrated circuit. This combining achieves the necessary signal conversion while minimizing the total number of components.
3Adaptability or versatility
If active circuit components are used, then the conversion functionality is achieved, but design complexity and signal distortion increase
Solution Approach 1:
The patent replaces complex active circuit components with simple passive resistive elements and a current source. These simpler components are easier to design with and introduce less signal distortion, while still achieving the necessary signal conversion functionality through their passive operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces signal distortion and design complexity by using a single stage with passive elements, enabling precise tuning of output signal characteristics and minimizing the impact of high resistance MOS differential input stages, thus improving the conversion efficiency between full-swing single-ended and low-swing differential signals.
Implementation Method 1
The passive single-stage converter may include a fully passive network of a plurality of resistive elements. The resistive elements may include resistors and/or metal oxide semiconductor (MOS) devices operating in a linear region.
Data Source
AI summary
A single-ended to differential converter is presented. The converter may be configured to convert full-swing single-ended signals to low-swing differential signals within a single-stage, thereby reducing signal distortion. The converter may include a passive network of resistive elements, for example resistors and/or metal oxide semiconductor (MOS) devices operating in a linear region. The converter may also allow for adjustable design parameters such as a common mode, differential amplitude, and an output swing. The adjustments may all be made within the single-stage of the converter.