Temperature compensated crystal oscillator专利检索-温度补偿晶体振荡器晶体振荡器电子零件及设备专利检索查询-专利查询网

Temperature compensated crystal oscillator

阅读：647发布：2021-09-03

专利汇可以提供Temperature compensated crystal oscillator专利检索，专利查询，专利分析的服务。并且A crystal controlled oscillator is frequency sensitive to variations in crystal load capacitance in circuit with the crystal, to variations in temperature and to operation over extended periods of time. A variable capacitor is provided in circuit with the crystal so as to correct for the crystal frequency drifts due to changes in operation of the crystal over extended periods of time. A separate fixed capacitor is connected in series with the crystal and in circuit with the variable capacitor to provide part of the frequency determining circuit of the crystal oscillator. A temperature compensation network is coupled across the fixed capacitor and is responsive to temperature changes to provide a correct degree of load capacitance change in the circuit so that the oscillator frequency is maintained within a given frequency tolerance regardless of the adjustment of the variable capacitor which is used to adjust the crystal for frequency drift.，下面是Temperature compensated crystal oscillator专利的具体信息内容。

权利要求

1. A temperature compensated crystal oscillator comprising: a semiconductor device having an input electrode, an output electrode and common electrode, connection means for applying energizing potentials between said electrodes, a frequency controlling resonant circuit including a crystal connected in series with a series combination of a variable capacitor and a first fixed capacitor coupled between said input and said output electrode, regenerative feedback means comprising a pair of series connected fixed capacitors connected in shunt to said resonant circuit, a connection from the junction point of said series connected fixed capacitors to said common electrode to provide oscillations, said crystal being frequency sensitive to changes in the crystal load capacitance, to changes in temperature and to long term crystal aging, a network comprising a temperature variable resistance in series with a capacitance responsive to said temperature changes at a given selected frequency and connected in said oscillator provide a given degree of crystal load capacitance change over a given frequency range so as to keep said selected frequency within a given frequency tolerance for frequency shifts due to said temperature changes, said variable capacitor functioning to correct the crystal frequency drifts due to long term crystal aging and which when varied changes said degree of crystal load capacitance by said network so that said selected frequency is outside said given frequency tolerance, said network being connected across only said first fixed capacitor thereby reducing said changes brought about by the setting of said variable capacitor in the degree of load capacitance change by said network to thereby maintain said given frequency tolerance.

2. The combination as claimed in claim 1 wherein the values of said pair of series connected fixed capacitors in shunt with said resonant circuit are relatively large compared to said series combination of said variable and said first fixed capacitors making the oscillator frequency primarily dependent on the crystal in series with said series combination of said first fixed and said variable capacitor.

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Temperature compensated crystal oscillator

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