SAW Resonator Driving Circuit for Fast Oscillation Start-Up
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Solution Overview
Problem
Oscillators using Surface Acoustic Waves (SAW) resonators exhibit an initial delay of approximately 20-30 microseconds to start oscillating, which is undesirable for rapid frequency signal and data transmission systems.
Innovation Solution
A surface wave resonator driving circuit comprising a static capacitor and reactive means, such as an inductor, that resonates at a predetermined frequency during the initial driving period, combined with passive means like resistors to maintain oscillations, allowing the SAW resonator to start oscillating rapidly by overcoming mechanical inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a SAW resonator is used in an oscillator circuit, then frequency stability is improved, but oscillation start-up time increases to 20-30 microseconds
Solution Approach 1:
The patent applies preliminary action by pre-charging a capacitor before the oscillation cycle begins. This stored charge is immediately discharged into the SAW resonator at the start of operation, providing an initial current impulse that accelerates the build-up of oscillation voltage. This preliminary energy storage and release mechanism reduces the start-up time from 20-30 microseconds to approximately 100 nanoseconds, while the SAW resonator continues to provide frequency stability during oscillation.
2Device complexity
If the driving circuit supplies voltage directly to the resonator, then the circuit complexity is reduced, but the oscillation build-up speed decreases
Solution Approach 1:
The patent introduces a capacitor as an intermediary energy storage element between the voltage source and the SAW resonator. This capacitor accumulates charge during a pre-charge phase and then releases it rapidly as a current impulse to the resonator, acting as a mediator that enables faster oscillation build-up. The addition of this single passive component achieves the speed improvement without significantly increasing overall circuit complexity.
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
Enables the SAW resonator to start oscillating within about 100 nanoseconds, significantly reducing the initial delay and enhancing the speed of oscillation in radio frequency and data transmission systems.
Implementation Method 1
reactive means adapted to resonate in combination with said static capacitor of the resonator at a predetermined frequency of the initial driving period of the resonator
Implementation Method 2
Oscillators in which oscillation frequency is stabilized by quartzes or piezoelectric resonators are known
Data Source
AI summary
A driving circuit of a surface wave resonator (X1) is described; the resonator comprises a static capacitor (Co) and the driving circuit is adapted to supply a voltage (Vx) to the resonator. The driving circuit comprises reactive means (L3) adapted to resonate in combination with said static capacitor (Co) of the resonator at a predetermined frequency (Fo) in the initial driving period of the resonator at said voltage; the driving circuit comprises passive means (R3) adapted to determine oscillations at said predetermined frequency (Fo).