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Voltage controlled oscillator and its control method

一种压控振荡器、变容二极管的技术，应用在功率振荡器、功率的自动控制、电气元件等方向，能够解决相位噪声特性恶化等问题

Inactive Publication Date: 2012-09-05
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, due to the effect caused by the 1 / f noise of the varactor diode in the frequency range not higher than the corner frequency fc, there arises a problem that the deterioration of the phase noise characteristic becomes remarkable

Method used

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  • Voltage controlled oscillator and its control method
  • Voltage controlled oscillator and its control method
  • Voltage controlled oscillator and its control method

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0026] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.

[0027] figure 2 It is a circuit diagram showing the configuration of an exemplary embodiment of a microwave band voltage controlled oscillator (VCO) according to the present invention.

[0028] The microwave band VCO of the present exemplary embodiment includes an oscillation transistor 10 as an oscillation active element, a load capacitor 11 provided on the emitter electrode side of the oscillation transistor 10, capacitors 16, 17, and capacitors 16 and 17 connected in series with each other. Variable capacitance varicap diodes 14, 15, connecting capacitor 12, and line 13.

[0029] The capacitor 16 and the variable capacitance diode 14 connected in series and the capacitor 17 and the variable diode 15 connected in series are connected in parallel with each other on the side of the variable capacitance diodes 14, 15 and connected to the oscillation transistor 10 thr...

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Abstract

An object of the present invention is to provide a voltage controlled oscillator in a microwave band without narrowing the variable frequency range and having improved phase noise characteristics. This invention is a voltage controlled oscillator in the microwave band which controls an oscillation frequency by a varactor diode, a varactor diode circuit in which a plurality of series-connected circuits having the varactor diode and a capacitance connected in series are connected in parallel and the varactor diodes include at least one or more GaAs varactor diodes of the HyperAbrupt type and atleast one or more Si varactor diodes of the Abrupt type.

Description

Technical field [0001] The invention relates to a voltage controlled oscillator. Background technique [0002] Japanese Patent Application Laid-Open No. 2004-320664 discloses a voltage-controlled oscillator. Japanese Patent Application Laid-open No. 2004-320664 discloses a technique for increasing the variable frequency amplitude without deteriorating the phase noise characteristics, including: a varactor diode circuit in which a plurality of varactor diodes and Open stub circuits are connected in parallel; multiple control circuits are used to independently apply a control voltage to each varactor diode in the varactor circuit, and to independently apply to each varactor diode through variable control The upper control voltage is controlled in turn to a value in the range from its lower limit to its upper limit, thereby controlling the compound capacitance value of the varactor diode circuit in the entire variable range. [0003] Due to the recent adoption of multi-value modulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/18H03L7/099
CPCH03B5/1243H03B2200/004H03B5/1231H03B5/1203H03B5/1296H03B5/1847
Inventor 伊藤诚一
Owner NEC CORP