Crystal Oscillator Switch Control for Fast Low-Power Startup
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Solution Overview
Problem
Conventional crystal oscillators consume significant electric power due to frequent loading and unloading of capacitors during startup, which is a concern for mobile applications with limited energy sources.
Innovation Solution
A crystal oscillator design featuring a switch that controls conductivity between capacitors, allowing for efficient startup and reduced impedance in driving mode, decoupling capacitors from the controller and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frequent loading and unloading of capacitors is used during startup, then fast startup is achieved, but electric power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the switch state changeable - it transitions from a closed state during startup to an open state during normal operation. This dynamic adjustment allows the system to optimize performance for different operational phases, achieving fast startup when needed while minimizing power consumption during steady-state operation.
Solution Approach 2:
The patent implements periodic action through the controller's regulation of the switch - periodically closing it during startup phase to charge capacitors for fast oscillator initiation, then periodically opening it during normal operation to reduce power consumption. This time-based control strategy separates the high-power startup transient from the low-power steady-state operation.
2Use of energy by moving object
If the switch conductivity is increased in driving mode, then power consumption is reduced, but impedance changes occur
Solution Approach 1:
The patent applies parameter changes by deliberately modifying the switch's conductivity parameter - changing it from high conductivity (closed) during startup to low conductivity (open) during driving mode. This parameter transformation allows the system to achieve low power consumption in steady-state while the controller manages the transition to maintain overall system stability.
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
The solution enables fast startup with significantly reduced electric power consumption, maintaining constant impedance and stable frequency output over time, particularly beneficial for portable electronic devices.
Implementation Method 1
A crystal oscillator is an electronic oscillating circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electric signal with a precise frequency
Implementation Method 2
By way of the third terminal the conductivity of the switch across first and second terminals can be controlled and/or modified
Data Source
Figure 1~3
AI summary
The disclosure concerns a crystal oscillator and a startup method for initiating operation of a crystal oscillator, the crystal oscillator comprises: a crystal resonator (12) comprising a first terminal (27) and a second terminal (29), - an electronic oscillator circuit (14) connected to the crystal resonator (12), - a first capacitor (21) comprising a first terminal (23) and a second terminal (25), the second terminal (25) connected to the first terminal (27) of the crystal resonator (12), - a second capacitor (22) comprising a first terminal (24) and a second terminal (26), the second terminal (26) connected to the second terminal (29) of the crystal resonator (12), characterized by - a switch (30) comprising a first terminal (31), a second terminal (32) and a third terminal (33), wherein an electrical conductivity between the first terminal (31) and the second terminal (32) of the switch (30) is controllable by a voltage at the third terminal (33), wherein the first terminal (31) of the switch (30) is connected to the first terminal (23) of the first capacitor (21) and wherein the second terminal (32) of the switch (30) is connected to the first terminal (24) of the second capacitor (22).