Sample-and-Hold Circuit Mode Switching for Temperature Leakage
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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 existing solutions to mitigate this often increase power consumption and circuit complexity.
Innovation Solution
Incorporating an elevated temperature detector that provides a mode selection signal to control the operational mode of the sample-and-hold circuit, avoiding additional circuits to measure leakage current, thus reducing power consumption and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuits are added to measure leakage current to mitigate temperature effects, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent extracts the temperature sensing function from a complex leakage current measurement system and implements it through a dedicated temperature sensor that directly measures temperature rather than inferring it from leakage current. This separation of functions simplifies the overall circuit architecture while maintaining accurate temperature measurement capability.
Solution Approach 2:
The patent introduces a temperature sensor as an intermediary device between the temperature effect and the control system. Instead of directly measuring leakage current to determine temperature effects, the temperature sensor provides a direct temperature reading that serves as an intermediate parameter for controlling the sample-and-hold circuit's operational mode.
2Reliability
If additional circuits are added to measure leakage current, then temperature effect mitigation improves, but power consumption increases
Solution Approach 1:
The patent separates the temperature measurement function from the signal processing circuitry by using a dedicated temperature sensor. This extraction allows for independent optimization of power consumption, as the temperature sensor can be designed with minimal power requirements and operated independently from the main signal path.
Solution Approach 2:
The patent changes the measurement parameter from leakage current to temperature directly. By measuring temperature as the primary parameter rather than inferring it from leakage current, the system achieves reliable temperature effect mitigation with lower power consumption, as temperature sensors generally consume less power than active leakage current measurement circuits.
3Measurement precision
If sampling frequency is increased to improve accuracy, then measurement precision improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of the sample-and-hold circuit's operational mode based on temperature conditions. The circuit can switch between different operating modes (e.g., continuous sampling, periodic sampling, or hold mode) depending on the temperature sensor output, allowing optimization of power consumption while maintaining measurement precision when needed.
Solution Approach 2:
The patent changes operational parameters such as sampling frequency and circuit mode based on temperature conditions. At lower temperatures where leakage current is minimal, the circuit can operate in a lower power mode with reduced sampling frequency. At elevated temperatures, the circuit switches to a higher precision mode with increased sampling frequency to compensate for increased leakage effects.
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
The solution effectively mitigates the impact of leakage current on accuracy while reducing power consumption and circuit complexity by using a single signal to control the sample-and-hold circuit's operational mode, thereby extending the operating time of limited power sources.
Implementation Method 1
an elevated temperature detector that provides a mode selection signal in response to a temperature sensor signal indicative of a temperature
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.