Oscillator calibration device and calibration method

Abstract

The present invention provides a calibration device and calibration method for an oscillator, wherein the oscillator includes a phase latch device for tracking a first reference clock generated by the oscillator until the phase of the first reference clock is aligned with the feedback clock, and for then tracking the second reference clock generated by the oscillator until the phase difference between the second reference clock and the feedback clock is a stable phase difference, wherein the feedback clock is obtained by divisoring the output oscillating signal of the phase latching device Generated by performing frequency division processing, the frequency of the second reference clock is different from the frequency of the first reference clock and there is a frequency difference between the two; a correction circuit is used to correct the divisor to the updated divisor to reduce the stable phase difference and a calibration circuit for calibrating the oscillation frequency of the oscillator according to the updated divisor, the updated divisor corresponding to the frequency difference. The embodiment of the present invention can calibrate the oscillation frequency of the oscillator to linearize the characteristic curve of the oscillator.

Description

[0001] 【Technical Field】 [0002] The present invention relates to a calibration device and a calibration method of an oscillator, in particular to a device and related method that can calibrate the characteristic curve of the oscillator. [0003] 【Background technique】 [0004] In a wireless communication system, an oscillator is used to generate an oscillating clock signal with a required oscillation frequency. Generally, the oscillation frequency range of an oscillator can be evaluated in two ways: dynamic range (DR) and static range (SR). The ideal oscillator dynamic range and static range can be found in figure 1 , figure 1 Shown is a schematic diagram of multiple characteristic curves of an ideal oscillator. The oscillator can be controlled to generate different oscillation frequencies according to automatic frequency control (AFC) codes (for example, 0 to 8191) and static frequency control codes (CapID codes) (for example, 0 to 127). Specifically, the central AFC code is use...

AI Technical Summary

Problems solved by technology

Therefore, the wireless communication system may not have enough margin to track temperature changes and crystal aging, and not enough margin to initialize crystal offset and static during the manufacturing process (such as soldering process). error

In addition, using traditional off-chip methods to test the dynamic range and dynamic range of the oscillator will not only consume time but also incur additional costs

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