Improved high-precision oscillator
A high-precision, oscillator technology, used in power oscillators, electrical components, etc., to achieve high-frequency output and accurate time values
Active Publication Date: 2015-06-24
WUXI ZGMICRO ELECTRONICS CO LTD
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[0006] figure 2 It is the working principle diagram of the current high-precision low-power oscillator disclosed in the document CN102386846A. Its frequency calibration linearity depends on device matching. The matching accuracy of conventional semiconductor manufacturing processes is about 0.1%, so the frequency of traditional oscillators is limited. Calibration accuracy of ±1000ppm
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[0044] attached image 3 The working principle diagram of the improved high-precision oscillator of the present invention is given, as shown in the figure, it includes a programmable oscillation unit and a first calibration circuit, and also includes a second calibration circuit, a logic controller, an adder and a subtracter, and Timing circuit; the second calibration circuit, adder and subtracter and logic controller constitute a correction circuit, and the timing circuit is realized by a counter.
[0045] The counter is set at the output end of the programmable oscillating unit, and is used for counting the output frequency; when the counting frequency value reaches the first threshold, it is reset, and then the oscillating signal output by the programmable oscillating unit is counted again;
[0046] The second calibration circuit outputs a plus control signal or a minus control signal according to the deviation between the actual frequency of the oscillation signal generate...
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The invention discloses an improved high-precision oscillator. A two-stage calibration circuit is adopted to complete calibration by two steps which include enabling a counter to be in segmented operations during counting, allowing a programmable oscillating unit to be in operation within a period of time on the basis of calibration signals generated by a first calibration circuit after calibration for the first time, using a digital circuit for counting, and enabling the programmable oscillating unit to be in operation within another period of time on the basis of calibration signals generated by a second calibration circuit after compensation according to deviation. The oscillator is enabled to approach to a theoretic output frequency within a standard time period as far as possible through two-stage calibration, and consequently, frequency output higher in precision can be realized, the limited + / -1000ppm calibration precision in the semiconductor manufacturing process can be broken through, and more accurate time values can be obtained.
Description
technical field [0001] The invention relates to a high-precision oscillator structure, in particular to the application field requiring extremely high precision of the oscillation frequency, such as the standby clock of the bluetooth system. Background technique [0002] In the data transmission system, the accuracy of the frequency is extremely high. For example, the standby clock in the Bluetooth system is very demanding. It is usually required that the frequency change is at least less than ±1000ppm, that is, one thousandth. Excessive clock deviation will lead to two needs. The Bluetooth system of communication cannot shake hands and wake up normally in sleep mode. With the development of technology, the new Bluetooth standard requires lower power consumption of the Bluetooth system. The connection time interval and fast connection are used to realize the transition between the sleep state and the working state. When the Bluetooth system enters the sleep state, it general...
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IPC IPC(8): H03B5/04
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD