DAC Output Range Adjustment With Resistor-Switch Segmentation
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Solution Overview
Problem
Existing digital-to-analog converters have limitations in adjusting the range of analog voltage signals, with current proportional, voltage proportional, and charge proportional types each having disadvantages such as large element values, poor matching, and non-adjustable output voltage ranges.
Innovation Solution
A digital-to-analog conversion circuit incorporating a conversion unit and a first adjustment unit, which includes code value receiving terminals and adjusts analog signals using resistor-selection sub-units and switch elements to obtain a target signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing digital-to-analog converters (current proportional, voltage proportional, or charge proportional types) are used, then conversion functionality is provided, but the output voltage range cannot be adjusted and element values are large with poor matching
Solution Approach 1:
The converter is divided into multiple resistor-selection sub-units, each handling a portion of the conversion process. This segmentation allows independent optimization of each sub-unit and enables flexible combination to achieve different output ranges without requiring large, poorly-matching elements in a single monolithic structure.
Solution Approach 2:
The patent introduces adjustable output voltage range capability through dynamic configuration of the resistor-selection sub-units. The converter can adapt its output range based on requirements, and the switch elements provide dynamic switching between different resistance configurations, enabling both range adjustment and maintained element matching quality.
2Ease of operation
If existing digital-to-analog converters are used, then basic conversion is achieved, but the circuit cannot effectively drive capacitive or resistive loads with accurate signals
Solution Approach 1:
The patent changes the output parameters of the converter by adjusting the configuration of resistor-selection sub-units and switch elements. This allows the circuit to maintain signal accuracy while adapting to different load conditions (capacitive or resistive), effectively providing both ease of operation for various loads and preservation of signal precision.
3Adaptability or versatility
If larger element values are used in existing converters, then output range increases, but element matching deteriorates and manufacturing precision decreases
Solution Approach 1:
By segmenting the converter into multiple resistor-selection sub-units with switch elements, the patent achieves extended output voltage range without requiring individually large element values. Each sub-unit can use smaller, better-matching elements, and their combined effect provides the desired large output range while maintaining manufacturing precision.
Data Source
AI summary
Provided are a digital-to-analog conversion circuit and method. The digital-to-analog conversion circuit includes a conversion unit and a first regulating unit. The conversion unit includes a first code value receiving terminal used to receive a first code value, and the conversion unit is used to convert the first code value into an analog signal. The first regulating unit includes a second code value receiving terminal used to receive a second code value. A signal input terminal of the first regulating unit is connected to a signal output terminal of the conversion unit. The first regulating unit is used to acquire a first analog regulation signal according to the second code value, and regulate, by using the first analog regulation signal, an analog signal transmitted by the conversion unit.