High Voltage Circuitry Drift Mitigation via Feedback Control
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Solution Overview
Problem
High voltage circuitry in applications like MEMS gyroscopes experiences stability issues due to long-term bias drift, caused by high voltage stress leading to charge trapping and resistance changes, which affects sensitivity and accuracy over time.
Innovation Solution
A circuitry comprising high voltage cells and resistors with a controller forming a closed feedback loop, where the substrate of resistors is biased to the output of high voltage cells to reduce voltage stress, and a clock adjustment circuitry adjusts clock frequency or amplitude to maintain stable output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high voltage is applied to achieve reasonable sensitivity in MEMS gyroscope, then sensitivity is improved, but long term bias drift occurs due to charge trapping and resistance changes
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the output voltage from the high voltage cells and adjusts the input voltage accordingly to maintain a stable output voltage. This closed-loop feedback system compensates for drift caused by charge trapping and resistance changes, preserving measurement precision over time while maintaining the high voltage necessary for sensitivity.
Solution Approach 2:
The patent dynamically adjusts electrical parameters (input voltage to high voltage cells) to compensate for degradation effects. By changing the input voltage parameter in response to detected output variations, the system maintains stable output voltage and mitigates bias drift while preserving the high voltage operation needed for sensitivity.
2Power
If high voltage stress is applied to resistors, then voltage multiplication is achieved, but charge trapping and resistance changes occur leading to drift
Solution Approach 1:
The controller uses feedback to monitor the output voltage and detect drift caused by resistance changes in the resistors. By continuously comparing the actual output voltage with the desired output voltage, the system adjusts the input voltage to compensate for resistor degradation, maintaining stable power output despite high voltage stress on the resistors.
Solution Approach 2:
The system applies preliminary compensation by adjusting the input voltage before significant drift occurs. The feedback mechanism detects early signs of resistance changes and preemptively adjusts operating parameters to counteract the effects of charge trapping, preventing substantial degradation in resistance stability and output voltage.
3Reliability
If closed feedback loop is implemented to stabilize output voltage, then long term bias drift is mitigated, but device complexity increases
Solution Approach 1:
The controller performs multiple functions: it generates the input voltage for the high voltage cells, monitors the output voltage, detects drift conditions, and adjusts operating parameters. By consolidating these functions into a single multi-functional controller, the patent reduces overall device complexity while maintaining the closed feedback loop necessary for bias drift mitigation.
Solution Approach 2:
The patent combines the voltage generation, monitoring, and adjustment functions into an integrated closed feedback system. By merging these previously separate functions into a unified control mechanism, the system achieves bias drift mitigation without proportionally increasing device complexity, as the combined system operates more efficiently than separate independent components would.
Data Source
AI summary
A device includes a plurality of high voltage cells (HVC) coupled to a plurality of resistors, and a controller. The plurality of HVC generates an output voltage that is higher than an input voltage to the plurality of HVC. The controller receives a reference voltage and an output voltage from a resistor of the plurality of resistors. The controller generates a signal responsive to a difference between the reference voltage and the output voltage. The controller forms a closed feedback loop with the plurality of HVC and the plurality of resistors. The generated signal is input to the plurality of HVC. A substrate of a resistor of the plurality of resistors is biased to an output of at least one high voltage cell of the plurality of HVC. Output of the at least one high voltage cell is input to another high voltage cell.