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Voltage controlled oscillator, single-chip microwave integrated circuit and high-frequency wireless apparatus

A voltage-controlled oscillation and circuit technology, applied in the field of MMIC and high-frequency wireless devices, and voltage-controlled oscillators, can solve problems such as inability to optimize circuit load, low phase noise characteristics, and inability to make

Inactive Publication Date: 2010-03-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, if the output frequency exceeds the millimeter wave band (over 30 GHz), it will be difficult to manufacture a resonator with a high Q value, and it will not be possible to manufacture a VCO with sufficiently low phase noise characteristics.
[0011] In the method of using a plurality of resonators described in Non-Patent Document 1, only the Q value at the fundamental frequency, that is, the oscillation frequency is improved, and the load on the circuit at the harmonic frequency cannot be optimized.
In addition, in the method of suppressing the voltage variation caused by the harmonic signal described in Non-Patent Document 2, only the circuit load at the harmonic frequency is considered, and the Q value at the fundamental frequency cannot be improved.
Therefore, in these methods, there is a problem that a sufficiently low phase noise characteristic cannot be obtained especially in a VCO whose output frequency exceeds approximately 30 GHz.

Method used

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  • Voltage controlled oscillator, single-chip microwave integrated circuit and high-frequency wireless apparatus
  • Voltage controlled oscillator, single-chip microwave integrated circuit and high-frequency wireless apparatus
  • Voltage controlled oscillator, single-chip microwave integrated circuit and high-frequency wireless apparatus

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Experimental program
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Effect test

Embodiment approach 1

[0032] figure 1 It is a diagram showing the configuration of the VCO according to Embodiment 1 of the present invention. figure 1 The VCO of the series positive feedback structure is shown in the figure, and it shows the high-order harmonic extraction that oscillates the electrical signal (that is, the fundamental wave signal) whose frequency is an integer fraction of the desired frequency and then extracts the high-order harmonic signal from the output terminal. type oscillator. 1 is a transistor, 2 is a varactor diode, 3 is a control voltage terminal, 4 is a signal output terminal, 5 is a front-end open-circuit stub with a length equivalent to 1 / 4 wavelength of the second harmonic signal, 12 and 13 are Line 14 is an emitter line, 15 is a fundamental wave reflection stub, and 16 is a bias voltage terminal. The varactor 2 , the line 12 , and the control voltage terminal 3 constitute a variable resonator by the capacitance component of the variable voltage of the varactor 2 a...

Embodiment approach 2

[0047] figure 2 It is a diagram showing the configuration of a VCO according to Embodiment 2 of the present invention. figure 2 Among them, 1~4 and 12~16 and figure 1 Similarly, 6 is a front short-circuit stub with a length corresponding to the wavelength of the second harmonic signal. A stub connected in parallel with a variable resonator with a short-circuit load at the second harmonic frequency can also be realized by using a front-end short-circuit stub. For the wavelength λ of the second harmonic signal, the following formula (2) is formulated The indicated line length (integer multiple of the wavelength of the second harmonic signal) is sufficient.

[0048] nλ (n=1, 2, ...) (2)

[0049] At a low frequency of approximately less than 1 GHz, the tip short-circuit stub 6 having a line length represented by the formula (2) also becomes a short-circuit load at the fundamental frequency. Therefore, the fundamental wave signal does not propagate to the variable resonator i...

Embodiment approach 3

[0062] Image 6 It is a diagram showing the configuration of a VCO according to Embodiment 3 of the present invention. Image 6 Among them, 1~4 and 12~15 are related to figure 1 Similarly, 7 is a bias circuit whose line length from the connecting part to the high-frequency short-circuit part via the capacitor (capacitor) 11 corresponds to the wavelength of the second harmonic signal.

[0063] As described in Embodiment 2 above, even if the front-end short-circuit stub 6 is not newly added, in the bias circuit, short-circuiting is carried out via the capacitor 11 at a position away from the connection position by a distance that satisfies the above-mentioned formula (2). , the same effect as that of the addition of the front-end short-circuit stub in the above-mentioned second embodiment can be obtained.

[0064] In addition, in the above description, the line length of the bias circuit 7 has been described as the length corresponding to the wavelength of the second harmonic ...

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Abstract

A voltage controlled oscillator having low phase noise and including: a variable resonator including a varactor 2 and a control voltage terminal 3; and an open-end stub 5 connected in parallel to the variable resonator, the open-end stub 5 having a length shorter than or equal to an odd multiple of one quarter of a wavelength of a harmonic signal plus one sixteenth of the wavelength of the harmonic signal, and longer than or equal to an odd multiple of one quarter of the wavelength of the harmonic signal minus one sixteenth of the wavelength of the harmonic signal. In this structure, the fundamental wave signal propagates both towards open-end stub 5 and the varactor 2 so as to realize a high Q value, and the open-end stub 5 has short-circuit load in harmonic signal, so that the harmonic signal can fully propagate towards the the open-end stub 5 thereby suppressing the variation of control voltage Vt coursed by the harmonic signal.

Description

technical field [0001] The invention relates to a voltage-controlled oscillator, MMIC (single-chip microwave integrated circuit) and a high-frequency wireless device, in particular to a voltage-controlled oscillator, MMIC and a high-frequency wireless device working in the microwave / millimeter wave region. Background technique [0002] With the spread of high-frequency wireless devices such as automotive radar and mobile phones, there is an increasing demand for high performance oscillators with output frequencies exceeding 1 GHz. An oscillator refers to a circuit that oscillates a high-frequency electrical signal inside the circuit and sends the high-frequency electrical signal to the outside. In particular, an oscillator provided with a control voltage terminal for changing an output frequency is called a VCO (Voltage Controlled Oscillator: Voltage Controlled Oscillator). The inside of the oscillator is equipped with active components such as transistors for amplifying hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/00H04B1/00
CPCH03B5/1847H03L7/099
Inventor 渡边伸介后藤清毅塚原良洋金谷康
Owner MITSUBISHI ELECTRIC CORP