A High Precision Microcomputer Compensated Crystal Oscillator
A technology of crystal oscillators and crystal oscillations, applied in biological neural network models, electrical components, neural architectures, etc., can solve problems such as insufficient temperature compensation accuracy, achieve improved frequency stability, high compensation accuracy, and overcome poor compensation effects Effect
Active Publication Date: 2019-01-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0008] In view of the above problems or deficiencies, in order to solve the problem of insufficient temperature compensation accuracy caused by fitting and interpolation in the existing microcomputer-compensated crystal oscillator, the present invention provides a high-precision microcomputer-compensated crystal oscillator
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[0047] Combine below Figure 4 , taking BP neural network as a model and taking VCTCXO mode as an example to give a specific embodiment of a high-precision microcomputer-compensated crystal oscillator of the present invention. It should be noted that this embodiment is only for explaining the present invention, not limiting the present invention, the artificial neural network in the present invention may be other forms of models, and the present invention is not only applicable to VCTCXO, but also applicable to TCXO.
[0048] This embodiment includes a PC, a control voltage generating module and a crystal oscillator module;
[0049] The PC is connected to the microprocessor in the control voltage generation module, used to realize data communication with the microprocessor and display the compensation voltage;
[0050] The control voltage generating module includes a microprocessor, a D / A module, an A / D module, a temperature sensor and a frequency counter, and its function is...
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The invention belongs to the field of integrated circuits, in particular to a high-precision microcomputer-compensated crystal oscillator based on an artificial neural network algorithm. The crystal oscillator includes a control PC, a control voltage generation module and a crystal oscillation module. The control voltage generation module is composed of a microprocessor, D / A, A / D, temperature sensor and frequency counter, and its function is to control the , to generate a nonlinear compensation voltage; wherein, the microprocessor uses an artificial neural network algorithm to generate a nonlinear compensation voltage. The invention uses the artificial neural network algorithm to generate the control voltage required at both ends of the varactor diode, and through the training of the artificial neural network, the network can approach the nonlinear function with high precision, thereby generating a control voltage that is a nonlinear function of the temperature , the voltage accurately compensates the frequency offset of TCXO and VCTCXO due to temperature changes by controlling the capacitance of the varactor diode, and significantly improves its frequency stability.
Description
technical field [0001] The invention belongs to the field of integrated circuits and relates to a temperature compensation system of a crystal oscillator, in particular to a high-precision microcomputer-compensated crystal oscillator based on an artificial neural network algorithm. Background technique [0002] As a stable frequency source, crystal oscillators are widely used in portable electronic equipment and wireless communication technology, and the stability of their frequency to temperature changes is one of the important indicators to measure the performance of crystal oscillators. In the field of navigation, radar and satellite positioning systems, the frequency stability of the crystal oscillator is required to reach 10 -7 -10 -8 order of magnitude. In order to improve the frequency stability of the crystal oscillator, it is necessary to adopt temperature compensation technology. [0003] The key to the temperature compensated crystal oscillator (TCXO) is to des...
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Login to View More IPC IPC(8): H03L1/02G06N3/04G06N3/08
CPCH03L1/022G06N3/084G06N3/045
Inventor 刘洋高宝玲王俊杰郭睿顾珣莫雁杰雷旭于奇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA