Supply Voltage Detection Circuit Without a BGR Reference
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Solution Overview
Problem
Existing supply voltage detecting circuits in electronic devices face challenges in reducing power consumption, miniaturization, and maintaining high detection accuracy, particularly due to the use of bandgap reference (BGR) circuits which increase power consumption and physical size, and reduce accuracy if not used.
Innovation Solution
A supply voltage detecting circuit utilizing a trim resistance circuit with an AND gate configuration, including trim resistors and switches, which allows for precise detection of stable supply voltage levels without a reference circuit, enabling miniaturization and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bandgap reference (BGR) circuit is used to detect stable supply voltage, then detection accuracy is improved, but power consumption increases and device size increases
Solution Approach 1:
The patent extracts and eliminates the BGR reference circuit from the voltage detection system, replacing it with a simplified detection circuit that uses basic voltage threshold comparison. This removal of the complex reference circuit directly reduces power consumption while maintaining adequate detection accuracy through alternative detection mechanisms.
Solution Approach 2:
The patent employs simple, low-cost voltage detection components instead of expensive and power-intensive BGR circuits. The detection circuit uses basic transistors and resistors that consume minimal power, effectively replacing the 'expensive' BGR solution with a more economical approach suitable for power-sensitive applications.
2Measurement precision
If a bandgap reference (BGR) circuit is used to detect stable supply voltage, then detection accuracy is improved, but device size increases
Solution Approach 1:
The patent removes the bulky BGR reference circuit from the device architecture, significantly reducing the physical footprint. The replacement detection circuit occupies minimal space while still providing reliable voltage stability detection, directly addressing the miniaturization requirement.
Solution Approach 2:
Instead of using a complex reference circuit to establish voltage thresholds, the patent inverts the approach by using simple threshold-based detection that requires minimal circuitry. This inverted methodology achieves detection functionality with far less physical space.
3Use of energy by moving object
If a bandgap reference (BGR) circuit is not used, then power consumption is reduced and device size is reduced, but detection accuracy deteriorates
Solution Approach 1:
The detection circuit is designed to self-regulate and self-calibrate using the supply voltage itself as the reference, eliminating the need for external BGR circuits. The circuit automatically detects voltage stability through intrinsic threshold comparisons, maintaining accuracy without additional power-consuming reference components.
Solution Approach 2:
The patent changes the detection parameters by using multiple voltage thresholds and staged detection levels instead of a single precise BGR reference. This parameter-based approach maintains detection accuracy across varying voltage conditions while consuming minimal power, as it relies on simple threshold comparisons rather than complex reference generation.
4Device complexity
If simple voltage detection is used without reference circuit, then device complexity is reduced, but detection accuracy deteriorates
Solution Approach 1:
The voltage detection process is segmented into multiple stages with different threshold levels. Instead of relying on a single complex reference circuit, the patent divides detection into sequential voltage threshold comparisons, each handled by simple circuit elements. This segmentation maintains low complexity while improving overall detection accuracy through multi-level verification.
Solution Approach 2:
The patent employs partial detection action by using multiple threshold levels rather than a single precise reference point. This excessive threshold checking approach compensates for the simplicity of individual detection stages, ensuring accurate voltage stability detection through cumulative verification without requiring complex reference circuitry.
Data Source
AI summary
An electronic device includes circuitry configured to output a first output signal shifting to a logic high level at a first time in response to a supply voltage reaching a first voltage level, output a second output signal shifting to a logic high level at a second time occurring after the first time in response to the supply voltage reaches a second level higher than the first level; and the circuitry includes an AND gate circuit configured to output a reset signal based on the first output signal and the second output signal.