Signal Processing Power Isolation for ADC Noise Immunity
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Solution Overview
Problem
Signal processing circuits, particularly analog to digital converters, are susceptible to noise propagation through the power supply rail, which can perturb critical decision-making processes and reduce the accuracy of conversion results.
Innovation Solution
Incorporating a switch or filter in the power supply to disconnect or attenuate noise from the power supply rail during critical decision periods, utilizing a reservoir capacitor to provide temporary power and reduce noise-induced errors, applicable to various converter technologies and signal processing circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal processing apparatus is continuously connected to the power supply, then it can maintain continuous operation and responsiveness, but noise from the power supply propagates to the circuit and perturbs critical decision-making processes
Solution Approach 1:
A reservoir capacitor is connected to the power supply of the signal processing apparatus. The capacitor is charged before critical operations and discharges to provide temporary power during these critical periods when the apparatus is disconnected from the power supply, preventing noise propagation while maintaining operation continuity
Solution Approach 2:
The power supply connection is periodically interrupted during critical decision-making periods. The apparatus alternates between being connected to the power supply (for recharging the capacitor and non-critical operations) and disconnected (during critical operations when noise immunity is required)
2Reliability
If the signal processing apparatus is disconnected from the power supply during critical operations, then noise immunity is improved, but the apparatus cannot maintain continuous operation
Solution Approach 1:
The reservoir capacitor is pre-charged from the power supply before critical operations begin. This preliminary charging ensures that sufficient energy is stored to power the apparatus throughout the entire critical decision-making period without requiring continuous power supply connection
Solution Approach 2:
The reservoir capacitor acts as an intermediary energy storage device between the power supply and the signal processing apparatus. It buffers the power supply interruptions by providing temporary power during critical operations, enabling disconnection without operational interruption
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 significantly improves noise immunity and accuracy by isolating the signal processing apparatus from power supply noise during critical operations, enhancing the reliability of conversion results.
Implementation Method 1
utilizing a reservoir capacitor to provide temporary power
Data Source
AI summary
A signal processing apparatus that includes a circuit in which a signal processing function is performed during a first time period, the signal processing apparatus including or being associated with a switch or a filter in a power supply to the signal processing apparatus so as to disconnect the signal processing apparatus from the power supply or to filter the power supply during a second time period that is coincident with at least part of the first time period.