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Circuit device, oscillator, electronic apparatus, and vehicle

A technology for circuit devices and electronic equipment, applied in the fields of electronic equipment, moving bodies, circuit devices, and oscillators, can solve time-consuming problems and achieve the effect of aging correction

Active Publication Date: 2017-10-31
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the hold mode is released after entering the hold mode, it takes time until the PLL circuit converges to the locked state

Method used

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  • Circuit device, oscillator, electronic apparatus, and vehicle
  • Circuit device, oscillator, electronic apparatus, and vehicle
  • Circuit device, oscillator, electronic apparatus, and vehicle

Examples

Experimental program
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Embodiment Construction

[0051] Hereinafter, preferred embodiments of the present invention will be described in detail. In addition, the present embodiment described below does not unduly limit the content of the present invention described in the claims, and not all configurations described in the present embodiment are necessarily solutions of the present invention.

[0052] 1. Structure

[0053] figure 1 This is a configuration example of the circuit device 500 of this embodiment. The circuit device 500 includes a phase comparison unit 40 (phase comparison circuit), a processing unit 50 (processing circuit), and an oscillation signal generation circuit 140 .

[0054] The phase comparison unit 40 compares the phase of the oscillation signal OSCK generated by the oscillation signal generation circuit 140 with the phase of the reference signal RFCK, and outputs the result as phase error data PED. Specifically, the phase comparison unit 40 includes a counter 42 that counts the number of clocks of t...

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PUM

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Abstract

The invention provides a circuit device, an oscillator, an electronic apparatus and a vehicle. The circuit device includes a phase comparator that performs phase comparison between an input signal based on an oscillation signal and a reference signal, a processor that performs a digital signal process on phase comparison result data which is a result of the phase comparison so as to generate frequency control data, and an oscillation signal generation circuit that generates the oscillation signal having an oscillation frequency which is set on the basis of the frequency control data. The processor performs the digital signal process by using data used when a hold-over state is ended in a case where the hold-over state occurs due to the absence or the abnormality of the reference signal, and then the hold-over state is ended.

Description

technical field [0001] The present invention relates to a circuit device, an oscillator, electronic equipment, a mobile body, and the like. Background technique [0002] Conventionally, oscillators such as an OCXO (oven controlled crystal oscillator) and a TCXO (temperature compensated crystal oscillator) have been known. In base stations, network routers, measurement equipment, etc. that use such an oscillator as a reference signal source, a PLL (Phase Locked Loop) circuit including the oscillator is configured to combine the oscillation signal of the oscillator with a reference signal such as a GPS signal. Synchronize. When the reference signal disappears or the reference signal becomes abnormal, the PLL circuit cannot synchronize the oscillation signal with the reference signal. This state is called a hold-over mode. [0003] As an oscillator control technique in the hold mode, there is, for example, the technique disclosed in JP-A-2015-115933. In Japanese Patent Appl...

Claims

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Application Information

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IPC IPC(8): H03B5/32H03L7/095
CPCH03B5/326H03L7/095H03B5/362H03B5/368H03L1/022H03L1/028H03L7/085H03L7/093H03L7/1075H03B2200/0018H03B5/32H03L1/00
Inventor 中岛克仁
Owner SEIKO EPSON CORP