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系统设计的要求和目前模拟温补晶振(PCT)(英文缩写为TCXO,译注)的性能限制势必导致研究新一代数字温补晶振(PCTN)(英文缩写为DTCXO,译注)。数字温补晶振电路主要由四部分组成,即振荡器、传感器、可编程序存贮器和变换器.数字补偿原理是将谐振器由温度引起的(频率偏移)曲线存入存贮器内,因而要用一个温度计来指示谐振器的温度。这个方法用一个压电谐振器作传感器,其频率的温度变化关系是完全线性的,通过频率计数获得温度信息,以此信息直接寻址存贮器,再经数摸变换器向变容二极管送出一个校正值。用这种结构的PCTN,它的频率稳定度在-40～+85℃的宽温度范围内可达5×10~(-7)。如果PCTN采用将计数系统及两个振荡器集成化的门阵列电路,则其体积小于70cm~3。PCTN的主要特性,除了频率稳定性与温度关系之外,其工作频率范围是2～20MHz,且电平与TTL或MOS系统兼容。为使频率稳定度在工作温度范围内降至1×10~(-(?)),要采用新技术,正研究一种双旋转切割谐振器,它同时以两种模式振动,其中一种作为温度传感器,并已获得有希望的初步结果,它的频率稳定度在-40～+85℃工作温度范围内应小于1×10~(-7)。
The system design requirements and the current performance limitations of simulated temperature-compensated crystal oscillator (PCT) (TCXO) will inevitably lead to the study of a new generation of digital temperature-compensated crystal oscillator (PCTN) (abbreviated as DTCXO). Digital temperature compensated crystal oscillator circuit is mainly composed of four parts, namely, oscillator, sensor, programmable memory and converter digital compensation principle is the temperature caused by the resonator (frequency offset) curve stored in memory , So use a thermometer to indicate the temperature of the resonator. In this method, a piezoelectric resonator is used as a sensor, and the relationship between the temperature and frequency of the frequency is completely linear. Temperature information is obtained through frequency counting, and the information is directly addressed to the memory and then sent to the varactor via the digital-to-analog converter A correction value. With this structure of PCTN, its frequency stability in the wide temperature range of -40 ~ +85 ℃ up to 5 × 10 -7. If PCTN uses a gate array circuit that integrates a counting system and two oscillators, its volume is less than 70cm-3. The main features of PCTN, in addition to the frequency stability and temperature, the operating frequency range is 2 ~ 20MHz, and the level and TTL or MOS system compatible. In order to reduce the frequency stability to 1 × 10 ~ (-)? Within the operating temperature range, a new technique is under investigation. A double-rotation cutting resonator is being investigated that oscillates simultaneously in two modes, one of which Temperature sensor, and has been promising preliminary results, its frequency stability in the -40 ~ +85 ℃ operating temperature range should be less than 1 × 10 ~ (-7).