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Oscillation circuit, semiconductor integrated circuit device, vibrating device, electronic apparatus, and moving object

A technology of oscillating circuits and synthetic capacitors, applied in power oscillators, electrical components, etc., can solve problems such as increased circuit scale and power consumption

Active Publication Date: 2014-04-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the method disclosed in Patent Document 1 is applied to a TCXO, the circuit scale and power consumption may increase.

Method used

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  • Oscillation circuit, semiconductor integrated circuit device, vibrating device, electronic apparatus, and moving object
  • Oscillation circuit, semiconductor integrated circuit device, vibrating device, electronic apparatus, and moving object
  • Oscillation circuit, semiconductor integrated circuit device, vibrating device, electronic apparatus, and moving object

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Embodiment Construction

[0073] Hereinafter, preferred embodiments of the present invention will be described in detail using the drawings. In addition, the embodiment described below does not unduly limit the content of the present invention described in the claims. In addition, all the configurations described below are not essential components of the present invention.

[0074] 1. Oscillation circuit

[0075] 1.1. Overall block diagram

[0076] figure 1 It is a figure which shows the structural example of the oscillation circuit 13 of this embodiment. The oscillation circuit 13 constitutes a part of a TCXO (Temperature Compensated X'tal Oscillator: Temperature Compensated Crystal Oscillator). In addition, the oscillator circuit 13 may omit or change a part of elements described below, or may have a configuration in which other elements are added.

[0077] The oscillation circuit 13 is connected to the oscillation element 226 and the amplifier circuit 224 to form the oscillation device 200 . T...

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PUM

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Abstract

An oscillation circuit includes a first variable capacitance part which includes a first variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a first reference voltage, and is connected to the oscillation circuit, a second variable capacitance part which includes a second variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a second reference voltage, and is connected to the oscillation circuit. If composite capacitance in the first variable capacitance part excluding the first variable capacitance element is first composite capacitance, composite capacitance in the second variable capacitance part excluding the second variable capacitance element is second composite capacitance, and if the second composite capacitance is greater than the first composite capacitance, the second variable capacitance element having capacitance greater than the first variable capacitance element is used.

Description

technical field [0001] The present invention relates to an oscillation circuit, a semiconductor integrated circuit device, a vibrating device, electronic equipment, a mobile body, and the like. Background technique [0002] There is known a method of changing the frequency of the oscillation circuit by applying a voltage to a variable capacitance element arranged in the oscillation circuit to change the capacitance. An oscillator whose frequency is controlled by voltage is usually called a VCXO (Voltage Controlled X’tal Oscillator: Voltage Controlled X’tal Oscillator). TCXO (Temperature Compensated X’tal Oscillator: Temperature Compensated X’tal Oscillator) is an oscillator that uses this principle to suppress frequency deviation with respect to temperature. [0003] In a discrete oscillator, a variable capacitance element having a large capacitance change can be selected to form a circuit, but the characteristics of the variable capacitance element that can be used when an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/32
CPCH03B9/145H03B5/368
Inventor 石川匡亨山本壮洋板坂洋佑
Owner SEIKO EPSON CORP