ADC Power-Mode Switching for Wide Dynamic Range Sensing
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Solution Overview
Problem
Existing microcontroller systems face challenges in achieving low power consumption while maintaining high performance and dynamic range, particularly due to interactions with peripherals that disrupt low power modes and require efficient power management protocols.
Innovation Solution
A low power analog-to-digital converter system with programmable gain amplifiers and a controller that switches between power modes, combined with a negative temperature coefficient buck converter and secure boot mechanisms, to optimize power usage and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ADC and programmable gain amplifier operate in high performance mode continuously, then measurement precision and dynamic range are improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between power-up mode and reduced power mode based on operational requirements. The controller activates the ADC and programmable gain amplifier in power-up mode when high precision measurement is needed, and transitions to reduced power mode during idle periods or when lower precision suffices, optimizing the balance between measurement precision and power consumption
Solution Approach 2:
The ADC operates in periodic sampling intervals rather than continuously. The controller enables the ADC and programmable gain amplifier only during designated sampling windows, allowing the system to return to reduced power mode between samples. This periodic operation maintains measurement precision when needed while significantly reducing average power consumption during extended idle periods
2Use of energy by moving object
If the microcontroller enters low power mode frequently, then power consumption is reduced, but system responsiveness and productivity deteriorate due to peripheral interrupts
Solution Approach 1:
The system employs autonomous event detection circuits that can trigger ADC sampling without requiring the microcontroller to exit low power mode. The programmable gain amplifier and ADC are configured to detect specific analog events (such as threshold crossings or signal changes) and automatically initiate conversion, allowing the microcontroller to remain in low power mode while maintaining system responsiveness to critical events
Solution Approach 2:
An intermediate control circuit acts as a mediator between peripheral interrupts and the microcontroller. Instead of allowing all peripheral interrupts to immediately wake the microcontroller, the intermediary filters and prioritizes interrupts, enabling the system to maintain low power mode while still responding to high-priority events through the intermediate control layer
3Use of energy by moving object
If voltage is reduced to lower power consumption, then energy usage decreases, but signal amplification capability and measurement range are limited
Solution Approach 1:
The system segments the signal conditioning function into multiple stages: the programmable gain amplifier provides initial signal amplification at low voltage, and the ADC performs high-precision conversion. This segmentation allows each component to operate optimally at reduced voltage levels while collectively achieving the required measurement precision and signal amplification capability that would be difficult to achieve with a single high-voltage component
Data Source
AI summary
A low power high bandwidth analog to digital converter system is disclosed. A first analog signal input receives an input signal. A first programmable gain amplifier receives the input signal. An analog to digital converter (ADC) is coupled to the output of the first programmable gain amplifier and samples the input signal for conversion to a digital signal. A controller is coupled to the ADC and the first programmable gain amplifier. The controller selects and enables either a reduced power mode or a power up mode for the first programmable gain amplifier and the ADC. The power up mode is selected and enabled when the input signal is to be sampled to operate the first programmable gain amplifier and the ADC to sample the input signal.