Predictive Angular Sensor Readout Circuit
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Solution Overview
Problem
Angular sensors with multiplexed outputs face reduced precision and increased power consumption due to halved oversampling rates, compromising speed and accuracy in predicting the next measurement along a trajectory.
Innovation Solution
A sensor readout system incorporating a selector circuit, predictor circuit, and select controller that identifies the most changed sensor input between two outputs (x and y components) to prioritize sampling, effectively halving the oversampling rate while maintaining precision by directing the selector circuit to pass the next signal on the channel with the most changed input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If multiplexed sensor outputs are sampled at reduced oversampling rate, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The predictor circuit performs preliminary action by predicting the next sensor output value before the actual sampling occurs. The selector circuit uses this prediction to pre-select which sensor channel (x or y) should be sampled next, allowing the sampling circuit to be prepared in advance and reducing the effective oversampling rate needed, thereby lowering power consumption while maintaining precision through intelligent prediction-based selection
2Productivity
If multiplexed sensor outputs are sampled at reduced oversampling rate, then readout speed is reduced, but device complexity is reduced
Solution Approach 1:
The predictor circuit performs preliminary analysis of sensor signal patterns to predict which channel will have the most significant change next. This prediction is made before the actual sampling decision, allowing the selector circuit to proactively choose the optimal channel. The select controller then uses this prediction to direct the sampling circuit, reducing the need for complex real-time analysis during sampling and thereby improving readout speed while keeping device complexity manageable through efficient prediction-based control
3Measurement precision
If alternating measurements are prepared for, then measurement precision is maintained, but power consumption increases
Solution Approach 1:
Instead of preparing for alternating measurements by continuously monitoring both channels, the predictor circuit performs preliminary prediction of which channel will change the most. The selector circuit then focuses sampling resources only on the predicted channel, avoiding unnecessary preparation and monitoring of both channels simultaneously. This selective preparation based on prediction reduces power consumption while maintaining measurement precision by ensuring the most relevant channel is always sampled
4Productivity
If alternating measurements are prepared for, then readout speed is improved, but device complexity increases
Solution Approach 1:
The predictor circuit performs preliminary prediction of channel changes, and the select controller uses this prediction to directly control the selector circuit's channel selection. This eliminates the need for complex real-time decision-making during the sampling process. The prediction is made in advance, allowing the sampling circuit to be prepared and switched channels more quickly, thereby improving readout speed while reducing device complexity by replacing complex real-time control with simpler prediction-based control
Data Source
AI summary
A sensor readout includes a selector circuit, a predictor circuit, and a select controller. The selector circuit receives a plurality of actual sensor inputs. Each actual sensor input is provided to the selector circuit along a corresponding channel. The selector circuit also passes a selected sensor input. The predictor circuit receives the selected sensor input into a signal history and generates predicted sensor inputs. The select controller receives the predicted sensor inputs, determines which of the predicted sensor inputs is most changed from the actual sensor inputs as the most changed input, and directs the selector circuit to pass a next signal on a the channel having the most changed input.