CHARACTERISTICS OF CRYSTALS

Department of Defense PIN 39950 CHARACTERISTICS OF CRYSTALS STRESSES THE IMPORTANCE OF FREQUENCY STABILITY AND INTRODUCES THE CRYSTAL CONTROLLED OSCILLATOR AS A POSSIBLE DEVICE USED TO OBTAIN THIS STABILITY. EXPLAINS THE PIEZOELECTRIC EFFECT OF A CRYSTAL, LISTS TYPES OF CRYSTALS HAVING THE PIEZOELECTRIC EFFECT, AND POINTS OUT THE RELATIONSHIP BETWEEN CRYSTAL THICKNESS AND FREQUENCY. VARIOUS CRYSTAL CUTS ARE EXPLAINED AND SHOWN GRAPHICALLY. THE Q OF THE CRYSTAL CIRCUIT IS EXPLAINED, AND BOTH THE PHYSICAL DIMENSIONS AND ELECTRICAL CHARACTERISTICS OF A TYPICAL CRYSTAL ARE DISCUSSED.