Optical Image Stabilization Circuit Gyroscope Drive Synchronization
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Solution Overview
Problem
Optical image stabilization circuits in portable devices are susceptible to power and ground noise due to shared power and ground connections, which can adversely affect onboard sensing components like gyroscopes, leading to inaccurate measurements.
Innovation Solution
Synchronizing the gyroscope and drive circuit using gyroscope data ready signals and reset signals to isolate the gyroscope sensing cycle from noise generated by the drive circuit, ensuring accurate position measurements by aligning position sensing timing with power drive signals that are not transitioning between power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drive circuit uses a large current source to drive the actuator, then the actuator can move the camera lens effectively, but power and ground noise is generated that adversely affects the gyroscope sensing components
Solution Approach 1:
The patent divides the power distribution into separate domains by providing dedicated power and ground connections for the gyroscope that are isolated from the drive circuit's power and ground connections. This segmentation prevents noise from the high-power drive circuit from coupling into the sensitive gyroscope circuitry through shared power/ground paths.
Solution Approach 2:
The patent introduces synchronization signals (data ready signal and reset signal) as intermediaries that coordinate the timing between the gyroscope and drive circuit. By synchronizing the gyroscope's data acquisition with the drive circuit's operation, the system ensures that sensitive measurements occur during periods when the drive circuit is not transitioning power levels, thereby isolating the gyroscope from noise.
2Device complexity
If the gyroscope and drive circuit share power and ground connections, then the circuit design is simplified, but the gyroscope becomes susceptible to noise from the drive circuit
Solution Approach 1:
The patent segments the electrical connections by providing separate power and ground paths for the gyroscope and drive circuit. This physical separation in the power distribution network eliminates the noise coupling pathway while maintaining a relatively simple overall circuit architecture.
Solution Approach 2:
The patent implements preliminary synchronization actions where the controller uses data ready signals and reset signals to prepare and coordinate the timing of the gyroscope with the drive circuit operations. This preliminary coordination ensures that measurements are taken at optimal times before noise from power transitions occurs.
3Productivity
If position measurements are obtained during power drive signal transitions, then measurement timing is simplified, but measurement accuracy deteriorates due to noise interference
Solution Approach 1:
The patent implements preliminary synchronization where the controller coordinates measurement timing with drive circuit operations using data ready signals. This ensures that position measurements are obtained during stable periods of the drive cycle, before power transitions occur, thereby maintaining both measurement speed and accuracy.
Solution Approach 2:
The patent uses feedback mechanisms where the controller monitors the state of the drive circuit and adjusts the timing of gyroscope measurements accordingly. The data ready signal and reset signal provide feedback about the drive circuit's operational state, enabling the controller to synchronize measurements with noise-free periods.
Data Source
AI summary
Various embodiments provide an optical image stabilization circuit that synchronizes its gyroscope and drive circuit using gyroscope data ready signals and gyroscope reset signals. In response to a gyroscope data ready signal, the optical image stabilization circuit synchronously obtains position measurements of a camera lens when power drive signals are not transitioning from one power level to another power level, and synchronously transitions the power drive signals simultaneously with gyroscope reset signals. By synchronizing the gyroscope and the drive circuit, the gyroscope and other onboard sensing circuits are isolated from noise generated by the drive circuit.