Quartz Crystals


Posted on Feb 5, 2014

The drive level of a crystal unit is shown by the level of the operating power or the current consumption (see Figures 9, 10, and 11). Operating the crystal unit at an excessive power level will result in the degradation of its characteristics, which may cause frequency instability or physical failure of the crystal chip. Design your circuit within


Quartz Crystals
Click here to download the full size of the above Circuit.

absolute maximum drive level. The load capacitance (CL) is a parameter for determining the frequency of the oscillation circuit. The CL is represented by an effective equivalent capacitance that is loaded from the oscillation circuit to both ends of the crystal unit (see Figure 12). The oscillation frequency varies depending upon the load capacitance of the oscillation circuit. In order to obtain the desirable frequency accuracy, matching between the load capacitances of the oscillation circuit and the crystal unit is required. For the use of the crystal unit, match the load capacitances of the oscillation circuit with the load capacitances of the crystal unit. To ensure stable oscillation, the negative resistance of the circuit should be significantly larger than the equivalent series resistance (the oscillation allowance is large). Ensure that the oscillation allowance is at least five times as large as the equivalent series resistance. Add resistor "Rx" to the crystal unit in series and ensure that the oscillation starts or stops. The approximate negative resistance of the circuit is the value obtained by adding the effective resistance "Re" to the maximum resistance "Rx" when the oscillation starts or stops after gradually making Rx value larger. Please make sure to consider the temperature range and frequency accuracy you need since magnitude of frequency variation becomes larger and larger as the temperature range...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Motorcycle Alarm
    50 Watt Power Amplifier
    RF based Automatic meter reading
    Pulsed infrared diode circuit
    Sequential flasher
    Mosfet Power Amplifier Circuit
    20Wpp Audio Amplifier with Bass
    Modular Phono Preamplifier
    VU meter circuit for LM3915 PCB
    SIMPLE INVERTER CIRCUIT 230V
    35W resistive and capacitive half-wave phase-shift trigger doer control circuit
    Monostable circuit diagram of the use of video amplifiers and comparators



    Top