Dual-Section DA Converter for Precise Gain Control in AD Conversion
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Solution Overview
Problem
Existing DA converters face challenges in achieving high-precision gain adjustment for analog signals, particularly in single-slope integration type AD conversion methods, where precise control of the reference signal's slope is necessary for accurate gain adjustment.
Innovation Solution
A DA converter configuration with a first DA conversion section for generating an analog output signal and a second DA conversion section for generating a gain control output signal, allowing for digital control of the gain adjustment of the analog output signal, utilizing a current-output type DA conversion circuit with upper and lower current-source cells for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional DA converter is used for gain adjustment in single-slope integration type AD conversion, then the circuit structure is simple, but the gain adjustment precision is insufficient
Solution Approach 1:
The DA converter is divided into two independent sections: a first DA conversion section for generating the analog output signal and a second DA conversion section for generating the gain control output signal. This segmentation allows each section to be optimized for its specific function, with the second section providing precise digital-controlled gain adjustment for the reference signal slope while the first section handles the main signal conversion.
Solution Approach 2:
The second DA conversion section serves multiple purposes: it generates the gain control output signal for adjusting the reference signal slope, enables digital control of gain adjustment, and improves AD conversion accuracy. This multi-functionality achieves high-precision gain control without proportionally increasing overall system complexity.
2Measurement precision
If the reference signal slope is not precisely controlled, then the circuit operation is simple, but the AD conversion accuracy deteriorates
Solution Approach 1:
The patent replaces analog mechanical adjustment methods with digital control mechanisms. The second DA conversion section uses digital input signals to control the gain adjustment of the reference signal slope, eliminating the need for manual or analog adjustment mechanisms and enabling precise, programmable control of the reference signal characteristics.
Solution Approach 2:
The patent changes the control parameter from analog voltage adjustment to digital signal control. By using a digital input signal for the second DA conversion section, the reference signal slope can be precisely controlled through digital values, allowing for accurate and repeatable gain adjustment without the limitations of analog control methods.
Data Source
AI summary
A DA converter includes a first DA conversion section for obtaining an analog output signal in accordance with a digital input signal value, and a second DA conversion section for obtaining an analog gain control output signal in accordance with a digital gain control input signal value. In the DA converter, the gain control of the analog output signal generated by the first DA conversion section is performed on the basis of the gain control output signal generated by the second DA conversion section.