Single-Slope ADC Range Extension With Flag-Controlled Ramp Switching
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Solution Overview
Problem
The existing single slope analog-to-digital converters (ADCs) have a limited input signal range, which restricts their application in IoT systems and other commercial products.
Innovation Solution
A single slope ADC capable of accepting an input signal range twice as large as that of the related art, utilizing a switch to receive input signals from sensors or ramp signals, a comparator to compare the sampled ramp signal with a predetermined input range, and a logic part to generate flag signals controlling the ramp generator's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the input signal range is expanded to twice the original range, then the adaptability and versatility of the ADC is improved, but the device complexity increases due to the need for additional switching mechanisms and state control
Solution Approach 1:
The input signal range is divided into two distinct ranges, with each range handled by a dedicated switching path. The first switch segment handles the first input range while the second switch segment handles the second input range, allowing the system to manage expanded functionality through modular segmentation rather than a monolithic complex structure
Solution Approach 2:
The switching mechanism is designed to perform multiple functions: it can selectively connect different input ranges to the comparator, control the ramp generator state, and generate appropriate flag signals. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby managing complexity while expanding adaptability
2Ease of manufacture
If the logic is simplified for easier commercial application, then the ease of manufacture and deployment is improved, but the measurement precision may be reduced due to fewer comparison states
Solution Approach 1:
The ramp generator operates in two dynamic states (first state and second state) that are selectively activated based on the input signal range. This dynamic operation allows the system to maintain precision across different input ranges by adapting the comparison process to the specific range being measured, rather than using a static single-mode approach that would compromise accuracy
Solution Approach 2:
Flag signals serve as intermediaries between the comparator output and the ramp generator control. These flag signals translate the comparison results into actionable control signals that switch the ramp generator between states, providing a simple yet effective mediation mechanism that maintains precision without requiring complex direct control logic
3Productivity
If the ramp generator operates in two distinct states, then the productivity and conversion speed is improved, but the device complexity increases due to state management requirements
Solution Approach 1:
The system employs feedback through flag signals that are generated based on comparator output and fed back to control the ramp generator state. This feedback mechanism automatically adjusts the ramp generator operation based on the current input signal characteristics, enabling fast conversion by selecting the appropriate state without requiring complex external state management circuitry
Solution Approach 2:
The ramp generator automatically transitions between its two operational states based on the flag signals generated from the comparator output. This self-service operation allows the system to manage its own state transitions without external intervention, improving conversion speed by eliminating the need for complex external state management while maintaining simplicity
Data Source
AI summary
Disclosed herein is a method of operating a single slope analog-to-digital converter (ADC), which includes receiving an input signal from a sensor or a ramp signal from a ramp generator according to a state of a switch and sampling the received input or ramp signal, comparing, by a comparator, whether the sampled ramp signal is present in a predetermined input range in a state in which the ramp generator maintains an off state and outputting the comparison result, generating, by a logic part, a flag signal indicating a high or low according to the comparison result by the comparator and providing the flag signal to the ramp generator, and sampling, by the ramp generator, a reference voltage of the comparator according to the flag signal based on an off or on state.