Calibration device for oscillator and method thereof
A technology for calibrating devices and oscillators, applied in automatic control of power, electrical components, etc., can solve problems such as time-consuming and cost-consuming, and achieve the effect of linearizing the characteristic curve
Inactive Publication Date: 2014-01-01
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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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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[0012] Certain terms are used in the specification and following claims to refer to particular elements. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This description and the subsequent claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the criterion for distinguishing. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" should be construed herein to include any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.
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A calibration device arranged for calibrating an oscillating frequency of an oscillator includes: a phase locking device arranged to track a first reference clock generated by the oscillator until a feedback clock is phase-aligned with the first reference clock, and then arranged to track a second reference clock generated by the oscillator until a phase difference between the second reference clock and the feedback clock is a static phase difference, wherein the feedback clock is generated by dividing an output oscillating signal of the phase locking device by a divisor; an adjusting circuit arranged to adjust the divisor into an updated divisor to reduce the static phase difference between the second reference clock and the feedback clock; and a calibrating circuit arranged to calibrate the oscillating frequency of the oscillator according to the updated divisor, wherein the second reference clock is generated by varying a control signal of the oscillator.
Description
【Technical field】 [0001] The present invention relates to an oscillator calibration device and a calibration method, in particular to a device capable of calibrating the characteristic curve of an oscillator and a related method. 【Background technique】 [0002] In wireless communication systems, oscillators are used to generate an oscillating clock signal with a desired oscillation frequency. Generally, the oscillation frequency range of an oscillator can be evaluated by two aspects: 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 several characteristic curves of an ideal oscillator. The oscillator can be controlled according to automatic frequency control (automatic frequency control, AFC) codes (eg, 0-8191) and static frequency control codes (CapID codes) (eg, 0-127) to generate different oscillation frequencies. Specifically, the AFC code at the center is ...
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IPC IPC(8): H03L7/099
CPCH03L7/1976H03L7/087H03L7/10H03L7/06H03L7/18H03L7/1077
Inventor 李文昶汪炳颖
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE