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The temperature compensated crystal oscillator (TCXO) is widely used as a stable frequency source of mobile communication equipment. A TCXO is composed of a temperature sensor, compensation voltage generator and voltage controlled crystal oscillator. The compensation function generator is a key component of a TCXO. In this paper, we have proposed a new MOS temperature compensation function generator...
In this paper, we have studied the quality factor of a dual-T quartz crystal resonator circuit of which its resonance frequency can be changed a several thousand ppm exceeding the limit of the piezoelectric coupling factor of a crystal resonator. We derived the relation between the quality factor of the dual-T circuit and the equivalent circuit parameters of the component crystal resonators. We have...
In this paper, we have proposed a dual-T quartz crystal resonator circuit of which its resonance frequency can be changed a several thousand ppm exceeding the limit of the piezoelectric coupling factor of a crystal resonator. We have made the measurement of the frequency characteristics of the proposed dual-T circuit composed of 9.995 MHz and 10.005 MHz crystal resonators having the same quality factors...
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