Abstract
AbstractA change of the oscillation frequency of an oscillator has commonly been achieved by changing the load capacitance of a crystal oscillator. Since the frequency changes nonlinearly with load capacitance, the rate of the frequency change varies with load capacitance. Therefore, when the frequency change through aging effects and/or due to the change in load capacitance occurs in TCXOs and VCTCXOs, the frequency shift must be compensated. However, the amount of compensation would be different before and after its adjustment.This paper describes a newly developed two‐port crystal resonator. This resonator has two independent load capacitances so that the frequency response and the oscillation frequency shift due to a temperature and/or capacitance fluctuation can be compensated independently. This function cannot be achieved in a conventional oscillator which has only one load capacitance.A formula to calculate the rate of a frequency change due to temperature and capacitance fluctuation has been derived by using the equivalent circuit of the two‐port crystal oscillator. The calculated value was found to be in good agreement with experimental result by taking into account stray capacitance. Therefore, this formula is useful for designing a two‐port crystal oscillator.
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