Real-time digital compensation to reduce acceleration's sensitivity in quartz resonator

Area of Science:

• Electrical Engineering
• Materials Science
• Sensor Technology

Background:

• Quartz resonators are sensitive to acceleration, causing frequency instability.
• Existing mechanical cushioning methods are ineffective at low frequencies.
• Miniaturized sensors are crucial for integrated systems.

Purpose of the Study:

• To develop a digital compensator for real-time frequency offset correction in quartz resonators under acceleration.
• To integrate a MEMS acceleration sensor with a quartz resonator for dynamic compensation.
• To demonstrate the effectiveness of the digital compensation system at low-frequency vibrations.

Main Methods:

• A triple-axis MEMS acceleration sensor (3 mm × 3 mm × 0.9 mm) was mounted on a quartz resonator.
• Acceleration sensitivity vector was calculated by analyzing sideband amplitudes during sinusoidal vibration.
• A Field-Programmable Gate Array (FPGA) based digital circuit generated real-time compensation voltage.

Main Results:

• The digital compensator effectively calculated frequency offsets and inferred compensation values.
• The system demonstrated significant frequency offset reduction, particularly at low-frequency vibrations.
• Steady-state performance showed near-elimination of frequency offset.

Conclusions:

• The developed digital compensator offers a flexible, low-cost, and easily applicable solution for stabilizing quartz resonator frequency under acceleration.
• The integration of MEMS sensors and digital compensation enhances performance in challenging vibration environments.
• This technology is suitable for miniaturized and cost-sensitive applications requiring precise frequency control.