Multi-Stage Oscillator Circuit for Fast Startup and Low Current
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Solution Overview
Problem
Conventional oscillator circuits with multiple inverter stages face challenges in achieving quick startup characteristics while minimizing current consumption and preventing abnormal oscillations, especially in battery-driven devices like mobile telephones and security systems, where the number of operational inverter stages needs to be dynamically adjusted between startup and stabilization phases.
Innovation Solution
The oscillator circuit employs a performance-variable inverter and an ON/OFF inverter, with the inverter control device managing their operational states to increase stages for quick startup and reduce stages for noise reduction and stability, using a performance-variable inverter with variable performance depending on the phase and disconnecting the ON/OFF inverter after startup to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple inverter stages are operational during startup, then startup characteristics are improved, but current consumption increases
Solution Approach 1:
The oscillator circuit dynamically changes the number of operational inverter stages based on the oscillation state. During startup, multiple inverter stages (first through fourth) are operational to provide high gain and improve startup characteristics. After startup completion, only the first and third inverter stages remain operational, reducing current consumption while maintaining stable oscillation.
2Reliability
If multiple inverter stages are operational during startup, then startup characteristics are improved, but abnormal oscillation may occur
Solution Approach 1:
The circuit transitions from a static to a dynamic configuration where the number of operational inverter stages changes based on oscillation amplitude. The startup completion determination circuit detects when oscillation reaches a stable threshold and triggers the inverter control device to reduce operational stages, preventing abnormal oscillation while maintaining quick startup.
Solution Approach 2:
The startup completion determination circuit provides feedback about the oscillation state to the inverter control device. When the oscillation amplitude reaches a predetermined threshold, the feedback signal triggers the reduction of operational inverter stages, creating a closed-loop control system that prevents abnormal oscillation while ensuring reliable startup.
3Use of energy by moving object
If single inverter stage is used in post-startup phase, then current consumption is reduced, but operation stability may deteriorate
Solution Approach 1:
The circuit maintains operational stability in the post-startup phase by dynamically selecting specific inverter stages (first and third) to remain operational. This dynamic configuration provides sufficient gain and negative resistance to maintain stable oscillation while consuming less current than having all four stages operational.
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 enhances startup characteristics, reduces current consumption, and achieves noise reduction and stability in the post-startup phase by dynamically adjusting inverter stages, preventing abnormal oscillations and ensuring reliable operation in battery-driven devices.
Implementation Method 1
an oscillator circuit, comprising: a piezoelectric vibrator (10); an amplifier device (20) connected in parallel to the piezoelectric vibrator (10) and configured to amplify an oscillation output from the piezoelectric vibrator (10)
Data Source
AI summary
An oscillator circuit comprises a piezoelectric vibrator, an amplifier device including inverters provided in a plurality of stages, and an inverter control device. The inverters provided in the plurality of stages includes a performance-variable inverter configured which is operational in both of an initial phase of oscillation startup and a post-startup phase where the oscillation is stabilized and capable of a variable performance depending on whether the initial phase of oscillation startup or the post-startup phase where the oscillation is stabilized, and an ON/OFF inverter which is operational in the initial phase of oscillation startup and disconnected in the post-startup phase where the oscillation is stabilized. The inverter control device have the performance-variable inverter and the ON/OFF inverter both operational and lowers the performance of the performance-variable inverter in the initial phase of oscillation startup, and the inverter control device disconnects the ON/OFF inverter and increases the performance of the performance-variable inverter in the post-startup phase where the oscillation is stabilized.