Low-noise temperature compensation crystal oscillator

Abstract

The invention relates to a low-noise temperature compensation crystal oscillator. The technical scheme is that the low-noise temperature compensation crystal oscillator comprises a crystal oscillator body (1), an oscillator power supply (2), a first-level voltage stabilization and noise reduction circuit (3), a second-level voltage stabilization and noise reduction circuit (4) and a temperature compensation circuit (5). The power supply input end X1 of the crystal oscillator body (1) is connected with the output end Vb of the oscillator power supply (2), the input end Z1 of the crystal oscillator body (1) is connected with the output end Y2 of the temperature compensation circuit (5), the input end X2 of the temperature compensation circuit (5) is connected with the output end Vc of the second-level voltage stabilization and noise reduction circuit (4), and the input end Vd of the second-level voltage stabilization and noise reduction circuit (4) is connected with the output end Ve of the first-level voltage stabilization and noise reduction circuit (3). The low-noise temperature compensation crystal oscillator reduces noise of a temperature measurement circuit, is improved in frequency stability, and has the advantages of being accurate in compensation and stable in output frequency.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators. In particular, it relates to a low-noise temperature-compensated crystal oscillator. Background technique [0002] Crystal oscillator is a high-precision and high-stability oscillator, which is widely used in consumer electronics, communication and computer systems, as a frequency generator to generate clock signals and reference signals for the system. In the past ten years, due to the needs of many mobile and portable technologies such as GSM, GPS, PDA, and CDMA, crystal oscillators have shown the characteristics of miniaturization, full integration, and full digitalization, and their development trends are high precision, high stability, and low noise. , low power consumption (low voltage operation, low level drive and low current consumption) and fast startup. [0003] The accuracy and stability of crystal oscillators are greatly affected by noise and ambient temperature. Reduci...

AI Technical Summary

Problems solved by technology

However, these methods have not completely solved the influence of noise on the frequency stability and precision of the oscillator. What is more serious is that the influence of noise on the temperature measurement system will cause the compensation circuit to not accurately compensate the frequency drift of the crystal oscillator.

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