SAR-DAC Current-Controlled Discharge for Smaller Capacitor Arrays
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Solution Overview
Problem
Successive approximation analog-to-digital converters (SAR-DAC) face challenges in achieving high precision and speed while maintaining low power consumption, leading to increased layout area and production costs due to the large capacitor matrix required for high-bit precision data conversion.
Innovation Solution
The SAR-DAC device incorporates a current-controlled discharging structure with a plurality of current beam circuit units, which discharges capacitors through specific terminals, reducing the number of charge redistributions and allowing for smaller capacitors, thereby reducing the layout area and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large capacitor matrix is used for high-bit precision data conversion, then measurement precision is improved, but area of stationary object increases
Solution Approach 1:
The capacitor matrix is segmented into multiple capacitor groups, where each group contains multiple capacitors. This segmentation allows the capacitors to be discharged in parallel through multiple discharge paths, reducing the charging-discharging time while maintaining the precision benefits of a large total capacitance.
Solution Approach 2:
The patent introduces a dynamic discharge mechanism where control signals dynamically activate different discharge paths based on the conversion stage. The discharging structure includes multiple discharge paths that can be selectively enabled, allowing the system to adapt its discharge capacity to the current conversion requirements, thus reducing overall conversion time while maintaining precision.
2Measurement precision
If a large capacitor matrix is used for high-bit precision data conversion, then measurement precision is improved, but productivity increases
Solution Approach 1:
The capacitor matrix is divided into multiple capacitor groups with corresponding discharge paths. This segmentation enables parallel discharging operations, where multiple capacitors can discharge simultaneously through different paths, significantly reducing the total charging-discharging cycle time while maintaining the precision advantages of the complete capacitor matrix.
Solution Approach 2:
The control unit dynamically activates specific discharge paths based on the conversion stage and required precision level. This dynamic control allows the system to optimize between speed and precision by enabling only the necessary discharge paths at each stage, improving overall conversion speed while maintaining required precision.
3Measurement precision
If a large capacitor matrix is used for high-bit precision data conversion, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The capacitor matrix is segmented into multiple groups that can be discharged independently through separate paths. This segmentation allows the system to discharge only the necessary capacitor groups for each conversion stage, reducing the total energy required compared to charging and discharging the entire capacitor matrix for every conversion operation.
Solution Approach 2:
The control unit dynamically activates only the discharge paths needed for the current conversion precision requirements. This dynamic control prevents unnecessary energy consumption by avoiding the activation of full discharge paths when lower precision is sufficient, thereby reducing overall power consumption while maintaining required precision.
4Measurement precision
If a large capacitor matrix is used for high-bit precision data conversion, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The capacitor matrix is divided into multiple capacitor groups with corresponding discharge paths, creating a modular structure. This segmentation simplifies the overall design by breaking down the complex large-capacitance system into manageable modules, each with its own discharge path, making the system easier to design, manufacture, and maintain while preserving the precision benefits.
Data Source
AI summary
SAR-DAC devices and operation methods of SAR-DAC devices are provided. An exemplary SAR-DAC device includes a comparator having a positive input terminal and a negative input terminal; and a DAC core unit including a first capacitor, a second capacitor, and a current-controlled discharging structure. The first capacitor includes a first charging-discharging terminal. The second capacitor includes a second charging-discharging terminal. The current-controlled discharging structure includes current beam circuit units. Each current beam circuit unit includes a first discharging input terminal connected to the first charging-discharging terminal and a second discharging input terminal connected to the second charging-discharging terminal. The current-controlled discharging structure is configured to discharge the first capacitor through the first discharging input terminal by using at least some of the current beam circuit units; and to discharge the second capacitor through the second discharging input terminal using at least some of the current beam circuit units.