Circuit devices, oscillators, electronic equipment, and moving objects

Abstract

Circuit devices, oscillators, electronic equipment, and moving objects. The circuit device includes: a processing unit that performs signal processing on input frequency control data to output the frequency control data; and an oscillation signal generation circuit that uses a vibrator to generate an oscillation signal at an oscillation frequency set by the frequency control data. The processing unit executes the a posteriori estimated value x through the time step k-1 in the updating process of the a priori estimated value in the Kalman filtering process. ^ (k-1) and the correction value D(k-1) are added to obtain the prior estimate x of time step k ^‑ (k), and according to the result of the Kalman filter processing, aging correction of the frequency control data is performed.

Description

technical field [0001] The present invention relates to a circuit device, an oscillator, electronic equipment, and a mobile body. Background technique [0002] Conventionally, oscillators such as an OCXO (oven controlled crystal oscillator) and a TCXO (temperature compensated crystal oscillator) have been known. For example, OCXOs are used as reference signal sources in base stations, network routers, measurement equipment, and the like. [0003] In oscillators such as such OCXOs and TCXOs, high frequency stability is desired. However, there is a problem that the oscillation frequency of the oscillator changes with time called aging, and the oscillation frequency fluctuates over time. For example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 2015-82815 as a conventional technique for suppressing fluctuations in oscillation frequency when a reference signal such as a GPS signal cannot be received and a so-called hold-over state is reached. . ...

AI Technical Summary

Problems solved by technology

However, there is a problem that there is a time-dependent change called aging in the oscillation frequency of the oscillator, and the oscillation frequency fluctuates over time

[0004] However, in this prior art, there is a problem that a storage unit having a large storage capacity is required as a storage unit for storing the correspondence relation information between the correction value and the elapsed time, which leads to an increase in the size of the circuit device.

For example, in order to achieve higher-precision aging correction, it is necessary to store a larger amount of correspondence information in the storage unit, resulting in a large-scale circuit device

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