Sample-and-Hold Circuit Temperature Control for Leakage Accuracy
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Solution Overview
Problem
Sample-and-hold circuits face accuracy issues due to leakage current, which increases with temperature, leading to erratic output behavior and increased power consumption when additional circuits are introduced to measure leakage current.
Innovation Solution
Incorporating an elevated temperature detector that uses a temperature sensor to generate a mode selection signal (VMODE) to control the operational mode of the sample-and-hold circuit, avoiding the need for additional circuits to measure leakage current and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuits are introduced to measure leakage current, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the temperature sensing function from a separate measurement circuit and integrates it directly into the existing sample-and-hold circuit structure. The temperature sensor is coupled to the hold element, allowing temperature-dependent leakage current effects to be detected without adding complex external measurement circuits.
Solution Approach 2:
The temperature sensor serves multiple functions: it detects temperature, indirectly measures leakage current effects, and triggers mode transitions. This multi-functionality eliminates the need for dedicated leakage current measurement circuits, reducing overall device complexity while maintaining measurement capability.
2Measurement precision
If additional circuits are introduced to measure leakage current, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent extracts the temperature sensing function from a separate measurement circuit and integrates it directly into the existing sample-and-hold circuit structure. The temperature sensor is coupled to the hold element, allowing temperature-dependent leakage current effects to be detected without adding complex external measurement circuits.
Solution Approach 2:
The temperature sensor automatically detects temperature changes and triggers mode transitions without requiring external control circuits. The sample-and-hold circuit self-adjusts its operation based on temperature conditions, eliminating the need for continuous power-consuming measurement and control infrastructure.
3Manufacturing precision
If sampling frequency is increased to maintain accuracy at elevated temperatures, then manufacturing precision is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic operation mode transitions based on temperature conditions. The circuit automatically switches between quiescent and active modes according to temperature thresholds, allowing sampling frequency and power consumption to adapt dynamically to environmental conditions rather than operating at fixed high levels continuously.
Solution Approach 2:
The patent changes operational parameters (sampling frequency, circuit activity) based on temperature conditions. At elevated temperatures, the circuit transitions to active mode with adjusted sampling parameters to maintain accuracy, while at normal temperatures it operates in quiescent mode with lower power consumption, optimizing the trade-off between precision and energy use.
4Use of energy by moving object
If analog circuit operates in quiescent state during hold intervals, then power consumption is reduced, but output signal accuracy deteriorates due to leakage current
Solution Approach 1:
The temperature sensor provides feedback about thermal conditions to the control logic, which then adjusts the operation mode accordingly. This feedback mechanism allows the circuit to maintain quiescent operation at normal temperatures while automatically transitioning to active mode when temperature-induced leakage current becomes problematic, preserving both power efficiency and accuracy.
Solution Approach 2:
The patent implements dynamic operation mode transitions based on temperature conditions. The circuit automatically switches between quiescent and active modes according to temperature thresholds, allowing sampling frequency and power consumption to adapt dynamically to environmental conditions rather than operating at fixed high levels continuously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively mitigates the adverse effects of leakage current on accuracy while minimizing power consumption and circuit complexity, extending the operating time of limited power sources.
Implementation Method 1
An elevated temperature detector has a detector output and a temperature sensor
Data Source
AI summary
In at least one example, an apparatus includes a logic circuit having a switch control output and first and second logic circuit inputs. A pulse generator has a generator output coupled to the first logic circuit input. An elevated temperature detector has a detector output and a temperature sensor. The detector output is coupled between the second logic circuit input and the temperature sensor.