Oscillator Current Modulation for Fast Start and Low Power

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Solution Overview

Problem

Conventional oscillators consume excessive power due to high initial oscillation currents, which are unnecessary once the target frequency is reached, leading to inefficient energy use.

Innovation Solution

Incorporating a frequency-to-voltage converter and a voltage-to-current converter to initiate oscillations with a high current and then reduce the current to a lower value after reaching the target frequency, maintaining stable output without interfering with normal operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a large oscillation current is applied to reach target frequency rapidly during initiation, then the oscillation speed is improved, but the power consumption increases excessively

Engineering Contradiction:
Improveoscillation initiation speedVSAvoidpower consumption
Core Design Contradiction:
SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the oscillation current variable rather than constant. The current is dynamically adjusted based on the oscillation state: a large current is applied during initiation to achieve rapid frequency acquisition, then automatically reduced to a smaller sustaining current once the target frequency is reached. This dynamic current adjustment resolves the contradiction by optimizing power consumption at different operational phases while maintaining fast initiation performance.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements periodic action through automatic current modulation cycles. The system periodically monitors the oscillation frequency and adjusts the current accordingly - applying high current during the initiation phase, then transitioning to low current during the sustaining phase. This periodic switching between high and low current states enables both rapid frequency acquisition and reduced steady-state power consumption.

Inventive Principle:
Principle #19Periodic action

2Stability of the object's composition

If a large oscillation current is consistently applied to sustain oscillation, then the oscillation stability is improved, but the power consumption remains unnecessarily high

Engineering Contradiction:
Improveoscillation stabilityVSAvoidpower consumption
Core Design Contradiction:
Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by modifying the current magnitude parameter based on oscillation state. During initiation, a large current parameter is used to ensure stable frequency acquisition. Once the target frequency is achieved, the current parameter is automatically reduced to a smaller value that maintains oscillation stability with minimal power consumption. This parameter adaptation resolves the contradiction between stability and power consumption.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent implements self-service through automatic current adjustment mechanisms that monitor oscillation frequency and autonomously regulate current levels. The system self-regulates by detecting when the target frequency is reached and automatically reducing the current from high to low levels, eliminating the need for external intervention. This self-service capability maintains oscillation stability while minimizing power consumption without requiring continuous external control.

Inventive Principle:
Principle #25Self-service

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 significantly reduces power consumption while maintaining a steady output frequency, optimizing the oscillator for energy-saving applications.

Implementation Method 1

The crystal circuit 102 includes a piezoelectric quartz crystal Pi

Methodology Applied
Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS9083319B2Oscillator and control method thereof
Publication Date: 2015.07.14 REALTEK SEMICON CORP
  • US9083319B2 patent drawing
  • US9083319B2 patent drawing
  • US9083319B2 patent drawing

AI summary

An oscillator and the control method thereof. The oscillator includes an oscillation unit to receive a first current and to generate an oscillating signal according to the first current, a frequency-to-voltage converter to receive the oscillating signal and to generate a converted voltage according to a frequency of the oscillating signal, and a voltage-to-current converter to receive the converted voltage and to generate the first current according to the converted voltage, wherein the first current is modulated from a first value to a second value after the initiation of the oscillation unit.