Method for determining design values for crystal oscillator circuit and electronic apparatus
A technology of quartz oscillation and design value, applied in the direction of power oscillators, electrical components, etc., can solve the problems of easy IC design, etc., and achieve the effects of easy design, realization of driving current, and realization of miniaturization
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[0052] The object of the present invention is to provide a clear relationship between the drive current Ios of a crystal oscillator circuit using a quartz oscillator, the value of the load capacitance CL and the negative resistance RL, and to determine what level of load capacitance to use in order to design the required drive current Ios The CL value and the negative resistance RL value are suitable methods.
[0053] figure 1 It is a diagram showing a measurement circuit used in order to clarify the relationship between the drive current Ios, the load capacitance CL, and the negative resistance RL in a crystal oscillation circuit using a crystal oscillator. basically and Figure 9 In the same figure, as the crystal vibrator 11, a crystal vibrator SSP-T7-FL (basic frequency: 32.768 KHz) made by SII was used. 12 is a CMOS inverter, and 13 is a constant current source, so that a constant current (this current is the driving current Ios) flows into the quartz oscillator circuit...
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