Crystal oscillation device, radio frequency module and electronic equipment
A crystal oscillator and crystal oscillator circuit technology, applied in the field of radio frequency, can solve the problems of clock signal conduction, radio frequency interference, affecting radio frequency performance, etc., and achieve the effect of improving communication quality and radio frequency performance indicators
Active Publication Date: 2020-05-15
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology
Generally, the ground pin of the crystal is connected to the main ground of the PCB through copper skin, which may cause the clock signal generated by the crystal and its frequency multiplied signal to be directly transmitted or leaked to the main ground of the PCB, and coupled to the crystal ground of other chips , generating radio frequency interference and affecting radio performance
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[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Preferred embodiments of the application are shown in the accompanying drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the application more thorough and comprehensive. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three...
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The invention relates to a crystal oscillation device, a radio frequency module and electronic equipment, and the crystal oscillation device comprises a substrate which comprises a signal layer and amain ground layer; a crystal oscillation circuit which is arranged on the signal layer, and comprises a crystal, a first capacitor and a second capacitor; and a filter network which is arranged on thesignal layer, and comprises an input port and an output port. A first pin of the crystal is connected with crystal ground through the first capacitor, a second pin of the crystal is connected with the crystal ground through the second capacitor, and the first capacitor and the second capacitor are used for adjusting frequency offset parameters of the crystal; and the input port is in crystal ground connection with the first capacitor and / or the second capacitor; the output port is connected with a main ground layer through a via hole and used for filtering radio frequency interference signals, an interference conduction path of the interference signals can be cut off, the interference signals generated by the interference conduction path are prevented from leaking to the main ground layerof the substrate from the crystal ground and being coupled to the ground of other chips to generate radio frequency interference, and the communication quality and radio frequency performance indexescan be improved.
Description
technical field [0001] The present application relates to the field of radio frequency technology, in particular to a crystal oscillation device, a radio frequency module and electronic equipment. Background technique [0002] In the design of electronic equipment, the clock signal generated by the crystal in the crystal oscillator circuit is generally used as a reference signal for chip work, which plays a very important role. Generally, the ground pin of the crystal is connected to the main ground of the PCB through copper skin, which may cause the clock signal generated by the crystal and its multiplied frequency signal to be directly transmitted or leaked to the main ground of the PCB, and coupled to the crystal ground of other chips , generating radio frequency interference and affecting radio frequency performance. Contents of the invention [0003] Embodiments of the present application provide a crystal oscillator, a radio frequency module, and electronic equipmen...
Claims
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IPC IPC(8): H03H9/56H03H9/19
CPCH03H9/19H03H9/56
Inventor 谭宇翔
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD