A crystal oscillator voltage and frequency modulation circuit and method
A technology of voltage regulation, frequency modulation and crystal oscillator, which is applied in the direction of electrical components, automatic power control, etc., can solve the problems of not deteriorating the output frequency phase jitter, temperature and aging characteristics, high conversion chip production cost and difficulty, etc., to achieve regulation, The effect of meeting the requirements of the accuracy level
Active Publication Date: 2021-10-22
上海鸿晔电子科技股份有限公司
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Problems solved by technology
[0002] The constant temperature crystal oscillator has a voltage-controlled frequency modulation function and the circuit is relatively mature, and has satisfied most low-end applications. However, due to the deviation caused by the temperature and aging characteristics of the constant temperature crystal oscillator and the production cost of high-level conversion chips Affected by factors such as high precision and difficulty, it is still a difficult problem to realize the function of high-precision voltage-controlled dynamic frequency modulation without deteriorating the output frequency phase jitter
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[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0017] Based on the technical problems described in the background technology, the inventors have found through research that so far, the constant temperature crystal oscillator with voltage-controlled frequency modulation function and circuits have been relatively mature, and have satisfied most low-end applications, but to achieve high-end It is still a difficult problem to accurately control the function of dynamic frequency modulation without deteriorating the output frequency phase jitter.
[0018] Taking the...
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The embodiment of the present invention discloses a crystal oscillator voltage regulation and frequency modulation circuit and method, by setting a first digital-to-analog conversion module, at least one second digital-to-analog conversion module and an adding circuit, the control module controls the output voltage of the first digital-to-analog conversion module And the output voltage of the second digital-to-analog conversion module is calculated by an adding circuit and then output to the crystal oscillator to be adjusted, so as to realize the adjustment of the crystal oscillator voltage to be adjusted. Since the frequency of the crystal oscillator to be adjusted changes with the change of its voltage, the output frequency of the first digital-to-analog conversion module and the second digital-to-analog conversion module are also adjusted accordingly when the output voltage of the first digital-to-analog conversion module and the second digital-to-analog conversion module are controlled, and after addition The output of the circuit to the crystal oscillator to be adjusted can ensure that the frequency accuracy level of the crystal oscillator to be adjusted can at least reach the frequency accuracy level of the first digital-to-analog conversion module and / or the second digital-to-analog conversion module. Therefore, the adjustment of the input voltage of the crystal oscillator to be adjusted is realized, and the accuracy level requirement for frequency adjustment of the crystal oscillator to be adjusted can be met.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of electronics and electrical engineering, and in particular to a crystal oscillator voltage and frequency modulation circuit and method. Background technique [0002] The constant temperature crystal oscillator has a voltage-controlled frequency modulation function and the circuit is relatively mature, and has satisfied most low-end applications. However, due to the deviation caused by the temperature and aging characteristics of the constant temperature crystal oscillator and the production cost of high-level conversion chips Affected by factors such as high precision and difficulty, it is still a difficult problem to realize the function of high-precision voltage-controlled dynamic frequency modulation without deteriorating the output frequency phase jitter. Contents of the invention [0003] The invention provides a crystal oscillator voltage regulation and frequency modulation ci...
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IPC IPC(8): H03L5/00H03L7/099
CPCH03L5/00H03L7/099
Inventor 薛代彬赵梓槟孙梁飞林楠
Owner 上海鸿晔电子科技股份有限公司