Yaw Rate Sensor Bias Current Adjustment for Rapid Startup
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Solution Overview
Problem
Yaw rate sensors in mobile terminals face a significant start-up time delay when switching from an energy-saver mode to a normal operating state, due to the oscillatory mass not being set into oscillation quickly enough, resulting in inefficient energy usage and prolonged initialization times.
Innovation Solution
The yaw rate sensor employs a reference-current generator with adjustable field-effect transistors to manage bias currents in amplifier circuits, allowing for a quick transition from energy-saver to normal mode by altering the channel width of transistors, thereby minimizing the impact on amplifier stability and enabling rapid startup without extended delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the yaw rate sensor is switched on periodically to reduce energy consumption, then energy consumption is reduced, but start-up time increases due to the oscillatory mass not being set into oscillation quickly
Solution Approach 1:
The bias current is made dynamically adjustable between two distinct operating modes: energy-saver mode with lower bias current and normal mode with higher bias current. This dynamic adjustment allows the system to optimize between energy consumption and start-up performance based on operational requirements
Solution Approach 2:
The patent changes the electrical parameter (bias current) of the amplifier circuits to resolve the contradiction. By adjusting the bias current level, the system can quickly transition from energy-saver mode to normal mode, reducing start-up time while maintaining energy efficiency during normal operation
2Use of energy by moving object
If a low bias current is used in energy-saver mode, then energy consumption is reduced, but bandwidth decreases and noise level increases
Solution Approach 1:
The system dynamically adjusts the bias current based on operational mode requirements. During normal operation, higher bias current provides better measurement precision and bandwidth. During energy-saver mode, lower bias current reduces energy consumption. The rapid switchability between modes mitigates the performance degradation
Solution Approach 2:
The bias current is periodically adjusted between high and low states based on operational needs. This periodic switching between different current levels allows the system to balance energy consumption with measurement precision requirements
3Use of energy by moving object
If the bias current is reduced in energy-saver mode, then energy consumption is reduced, but the oscillatory mass cannot be set into oscillation as quickly as desired
Solution Approach 1:
The bias current is made dynamically controllable to provide high current during start-up phase for rapid oscillation initiation, then switch to low current for energy-efficient steady-state operation. This dynamic control resolves the contradiction between energy consumption and start-up speed
Solution Approach 2:
The system prepares for rapid start-up by having the capability to immediately switch to high bias current mode when needed. The amplifier circuits are designed to quickly transition between current levels, enabling the oscillatory mass to be set into oscillation rapidly when the sensor is activated
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 allows for a trade-off between current consumption and performance, enabling the yaw rate sensor to switch quickly into its normal operating state, reducing the need for prolonged start-up times and optimizing energy usage in mobile terminals.
Implementation Method 1
the reference-current generator having a first field-effect transistor, the first field-effect transistor having a first channel width which is alterable in order to adjust the bias current. The channel width of the first field-effect transistor is proportional to the reference current carried by the first field-effect transistor.
Data Source
AI summary
A yaw rate sensor having a drive for exciting an oscillation of an oscillatory mass, the drive having at least one drive amplifier circuit, and having a detector for detecting a displacement of the oscillatory mass, the detector having at least one detector amplifier circuit, either a low bias current being able to be set for operating the drive amplifier circuit and/or the detector amplifier circuit in an energy-saver mode, or a higher bias current being able to be set for operating the drive amplifier circuit and/or the detector amplifier circuit in a normal mode.