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Voltage-controlled double-resonance quartz oscillator using variable-capacitance diode.

Ruzaini Izyan Binti Ruslan¹, Tomio Satoh, Tetsuya Akitsu

¹Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Japan.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|May 2, 2012

Summary

This study introduces a quartz crystal oscillator with variable frequency. The circuit achieves frequency tuning using variable-capacitance diodes, enabling a steep transition between LC and quartz crystal resonance modes.

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Area of Science:

Electrical Engineering
Electronics
Physics

Background:

Quartz crystal oscillators are fundamental frequency standards.
Achieving tunable and stable oscillation frequencies remains a challenge.
Existing designs often lack precise control over mode transitions.

Purpose of the Study:

To present a novel variable-frequency quartz crystal oscillator circuit.
To demonstrate frequency tuning through mode locking and variable capacitance.
To analyze the transition between LC and quartz crystal resonance modes.

Main Methods:

Implementation of a quartz crystal oscillator circuit utilizing variable-capacitance diodes.
Frequency locking of quartz crystal resonance to LC resonance.
Precise adjustment of control voltage to observe mode transitions.
Experimental demonstration and algebraic analysis of oscillation modes.

Main Results:

The circuit successfully oscillates at LC resonance under frequency locking of quartz crystal resonance.
A steep transition between LC oscillation and quartz crystal double-resonance modes was observed.
Characteristic changes in oscillation frequency were noted during mode transitions.
Experimental results were validated against algebraic analysis.

Conclusions:

The developed circuit offers a method for variable frequency operation in quartz crystal oscillators.
The use of variable-capacitance diodes facilitates precise control over oscillation modes.
The study provides a comprehensive understanding of mode transition dynamics in such oscillators.