WO2005124993A1 - 電圧制御発振器 - Google Patents
電圧制御発振器 Download PDFInfo
- Publication number
- WO2005124993A1 WO2005124993A1 PCT/JP2004/008525 JP2004008525W WO2005124993A1 WO 2005124993 A1 WO2005124993 A1 WO 2005124993A1 JP 2004008525 W JP2004008525 W JP 2004008525W WO 2005124993 A1 WO2005124993 A1 WO 2005124993A1
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- WO
- WIPO (PCT)
- Prior art keywords
- oscillation
- resonance circuit
- controlled oscillator
- circuit
- oscillation wave
- Prior art date
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
Definitions
- the present invention relates to a voltage controlled oscillator for correcting an oscillation frequency.
- Conventional voltage-controlled oscillators include an output terminal that outputs an oscillating wave to a load, a resonance circuit having a resonator, an active element that operates as an oscillating element having a negative resistance, and one of the powers of the oscillating wave.
- the loop phase of the voltage-controlled oscillator is shifted to a desired oscillation frequency and becomes in-phase.
- a method of adjusting the reflection phase of the resonance circuit is frequently adopted.
- the resonant circuit of the voltage-controlled oscillator has an open-end stub of the microstrip line as a resonator, and by physically changing the length of the open-end stub, the oscillation frequency of the voltage-controlled oscillator is increased. It is corrected (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 7-254819
- the oscillation frequency correction method described above is frequently employed, but the main factor of the oscillation frequency variation is a negative resistance. This is a characteristic variation of the active element, and by adjusting the resonance circuit with small variation, the Q value and loss of the resonance circuit, which are important parameters for the phase noise characteristics and stability of the voltage controlled oscillator, or tuning of the voltage controlled oscillator There was a problem that deteriorated the bandwidth.
- the present invention has been made to solve the above-described problems, and is intended to reduce the Q value and loss of a resonant circuit and the tuning bandwidth even when manufacturing variations occur in active elements. It is an object of the present invention to obtain a voltage-controlled oscillator that corrects an oscillation frequency.
- a voltage controlled oscillator includes an analog phase shifter connected between an active element and an oscillation wave reflection circuit to adjust a phase of an oscillation wave fed back from the oscillation wave reflection circuit to the resonance circuit. Things.
- the Q value of the resonance circuit can be adjusted by adjusting the phase of the oscillation wave that is fed back from the oscillation wave reflection circuit to the resonance circuit using an analog phase shifter. It has the effect of correcting the oscillation frequency without deteriorating the loss and the tuning bandwidth.
- a voltage controlled oscillator includes an analog phase shifter connected between a resonance circuit and an active element, for adjusting a phase of an oscillation wave fed back from the oscillation wave reflection circuit to the resonance circuit. .
- the Q value of the resonance circuit can be adjusted by adjusting the phase of the oscillation wave that is fed back from the oscillation wave reflection circuit to the resonance circuit using an analog phase shifter. It has the effect of correcting the oscillation frequency without deteriorating the loss and the tuning bandwidth.
- FIG. 1 is a block diagram showing a voltage controlled oscillator according to a first embodiment of the present invention.
- FIG. 2 is an operation explanatory view showing a voltage-controlled oscillator separated into two.
- FIG. 3 is an explanatory diagram showing frequency characteristics of a loop gain by a voltage controlled oscillator.
- FIG. 4 is an explanatory diagram showing frequency characteristics of a phase by a voltage controlled oscillator.
- FIG. 5 is a block diagram showing a voltage controlled oscillator according to a second embodiment of the present invention.
- FIG. 6 is a block diagram showing a voltage controlled oscillator according to a third embodiment of the present invention.
- FIG. 7 is a block diagram showing a voltage controlled oscillator according to a fourth embodiment of the present invention.
- FIG. 1 is a block diagram showing a voltage controlled oscillator according to a first embodiment of the present invention.
- an output terminal 1 outputs an oscillation wave having a desired oscillation frequency to a load.
- the resonance circuit 2 has a variable capacitance diode, changes the capacitance according to the magnitude of the DC voltage applied to the variable capacitance diode, resonates in a desired oscillation frequency band, and generates an oscillation frequency of the voltage controlled oscillator. Is varied by the bandwidth required for frequency modulation.
- the active element 3 is connected between the resonance circuit 2 and the output terminal 1 and operates as an oscillation element having negative resistance.
- the oscillation wave reflection circuit 4 includes the active element 3 and the output terminal 1. It is connected between them to feed back a part of the power of the oscillating wave to the resonance circuit 2 so as to excite the oscillation of the voltage-controlled oscillator.
- the oscillation wave that has not been fed back is output to the output terminal 1 load.
- a filter such as a band-pass filter or a high-pass filter can be considered.
- the microstrip line 5 connects the resonance circuit 2 and the active element 3 to each other.
- the analog phase shifter 6 is connected between the active element 3 and the oscillation wave reflection circuit 4, and adjusts a bias voltage (DC voltage) to be fed back from the oscillation wave reflection circuit 4 to the resonance circuit 2. It adjusts the phase of the wave and corrects the oscillation frequency to a desired frequency.
- a bias voltage DC voltage
- noise in the circuit of the voltage-controlled oscillator is amplified by the active element 3, and a part of the amplified power is fed back to the resonance circuit 2 by the oscillation wave reflection circuit 4. Is discharged by the resonance circuit 2 and further amplified by the active element 3. Oscillates and outputs oscillation from output terminal 1 to the load.
- This oscillation frequency is determined by the resonance frequency of the resonance circuit 2.
- the resonance frequency of the resonance circuit 2 is varied by the bandwidth required for the oscillation frequency of the voltage-controlled oscillator to be frequency-modulated.
- Fig. 2 is a diagram for explaining the operation of the voltage-controlled oscillator separated into two
- Fig. 3 is an explanatory diagram showing the frequency characteristics of the loop gain by the voltage-controlled oscillator
- Fig. 4 is the phase frequency by the voltage-controlled oscillator.
- FIG. 4 is an explanatory diagram showing characteristics.
- a loop gain G force S1 or more at the oscillation frequency ⁇ 1 is a necessary condition for exciting and sustaining the oscillation operation.
- the reflection phase C of the active element 3 becomes large, for example, due to the characteristic variation, mounting variation, and pattern dimension variation of the active element 3, for example.
- the loop phase A is shifted from the loop phase E, thereby causing an error between the oscillation frequency ⁇ 2 and the desired oscillation frequency ⁇ 1.
- the reflection phase D of the active element 3 is adjusted to be the reflection phase C. Then, the correction is performed so that the loop phase E becomes the loop phase A and the oscillation frequency ⁇ 2 becomes the desired oscillation frequency ⁇ 1.
- FIG. 1 In addition to the method of correcting the electric oscillation frequency by the analog phase shifter 6, the force of providing the microstrip line 5 in the active element 3 is shown in FIG.
- An open-end stub may be provided, and a physical oscillation frequency correction method for correcting the oscillation frequency of the voltage-controlled oscillator may be combined by physically changing the length of the open-end stub.
- the characteristic variation, the mounting variation, and the pattern size variation of the active element 3, that is, the manufacturing variation occur, and the desired oscillation frequency and the desired oscillation frequency are generated in the oscillation frequency. Even if an error occurs, it is an important parameter for the phase noise characteristics and stability of the voltage-controlled oscillator by electrically adjusting the reflection phase on the active element 3 side with the bias voltage of the analog phase shifter 6. It is possible to correct the oscillation frequency of the voltage controlled oscillator without deteriorating the Q value and loss of the resonance circuit 2 and the tuning bandwidth of the voltage controlled oscillator.
- an oscillation wave having a desired oscillation frequency can be output from the output terminal 1 to the load.
- the oscillation wave reflection circuit 4 can be easily constituted by constituting the oscillation wave reflection circuit 4 with a filter.
- the analog phase shifter 6 adjusts the phase of the oscillating wave fed back from the oscillating wave reflection circuit 4 to the resonance circuit 2 according to the magnitude of the applied bias voltage. Since the phase can be adjusted electronically rather than electrically, the adjustment time and the adjustment cost can be reduced, especially for high-frequency voltage-controlled oscillators that are sealed in a package. Can be easier.
- the resonance circuit 2 is constituted by a variable capacitance diode, and the oscillation frequency is varied by a bandwidth required for frequency modulation in accordance with the magnitude of the DC voltage applied to the variable capacitance diode. Therefore, the oscillation frequency can be easily changed.
- FIG. 5 is a block diagram showing a voltage controlled oscillator according to a second embodiment of the present invention.
- an oscillation wave reflection circuit 7 is connected between an analog phase shifter 6 and an output terminal 1 to generate an oscillation wave power. Is fed back to the resonance circuit 2 to excite and maintain the oscillation of the voltage controlled oscillator.
- the harmonic output at the high power level is Output from child 1 to the load.
- a filter such as a band-pass filter or a high-pass filter that passes a harmonic band of the oscillation wave and reflects the oscillation wave band is considered.
- Other configurations are the same as those in FIG.
- the oscillating wave reflecting circuit 4 a part of the power of the oscillating wave is fed back to the resonance circuit 2 by the oscillating wave reflecting circuit 4, and the oscillating wave that is not fed back there is output from the output terminal 1 of the voltage controlled oscillator to the load.
- the second embodiment almost all the oscillating waves are fed back to the resonance circuit 2 by the oscillating wave reflection circuit 7, and the non-linearity of the active element 3 is increased due to the increase of the loop gain.
- the harmonics output at the level are output from output terminal 1 to the load.
- FIG. 6 is a block diagram showing a voltage controlled oscillator according to Embodiment 3 of the present invention.
- an amplifier (oscillation wave reflection circuit) 8 is connected between an analog phase shifter 6 and an output terminal 1 to oscillate. It has a gain in the harmonic band of the wave, and returns almost all the oscillated wave to the resonance circuit 2 at the input terminal in the frequency band of the oscillated wave.
- Other configurations are the same as in Fig. 1.
- the amplifier 8 substitutes the oscillation wave reflection circuit 7. Things.
- FIG. 6 almost all oscillation waves are fed back to the resonance circuit 2 at the input end of the amplifier 8, and the nonlinearity of the active element 3 is increased due to the increase in loop gain.
- the harmonics output at a high power level due to the increase in the power are output from output terminal 1 to the load.
- the third embodiment As described above, according to the third embodiment, almost all of the power of the oscillating wave is fed back to the resonance circuit 2 in the amplifier 8, so that the active element 3
- the harmonics output at a high power level can be output from the output terminal 1 to the load due to the increase in the linearity, and the analog phase shifter 6 is applied to such a configuration as well.
- the same effect as in mode 1 can be obtained.
- the higher harmonics are amplified by the amplifier 8, so that a higher output level can be obtained.
- FIG. 7 is a block diagram showing a voltage controlled oscillator according to Embodiment 4 of the present invention.
- an analog phase shifter 6 is connected between a resonance circuit 2 and an active element 3 via a microstrip line 5,
- the bias voltage DC voltage
- the phase of the oscillation wave fed back from the oscillation wave reflection circuit 4 to the resonance circuit 2 is adjusted, and the oscillation frequency is corrected so that the oscillation frequency becomes a desired frequency.
- Other configurations are the same as FIG. 1 in which the oscillation wave reflection circuit 4 is provided, FIG. 5 in which the oscillation wave reflection circuit 7 is provided, and FIG. 6 in which the amplifier 8 is provided.
- the analog phase shifter 6 is connected between the active element 3 and the oscillation wave reflection circuit 4, the oscillation wave reflection circuit 7, or the amplifier 8.
- the analog phase shifter 6 is connected between the resonance circuit 2 and the active element 3.
- FIG. 7 shows the force of providing the microstrip lines 5 at both ends of the analog phase shifter 6.
- the reflection phase of the active element 3 is changed to the analog phase.
- the Q value and loss of the resonance circuit 2 which are important parameters for the phase noise characteristics and stability of the VCO, and the tuning bandwidth of the VCO are degraded.
- the oscillation frequency of the voltage-controlled oscillator can be corrected.
- the analog phase shifter 6 adjusts the phase of the oscillation wave fed back from the oscillation wave reflection circuit 4 to the resonance circuit 2 according to the magnitude of the applied bias voltage, Since the phase can be adjusted electronically rather than physically, the adjustment time and adjustment cost can be reduced, especially for high-frequency voltage-controlled oscillators that are built into the package and hermetically sealed. Later adjustments can be facilitated.
- the resonance circuit 2 has a variable capacitance diode, and the oscillation frequency of the voltage controlled oscillator is changed according to the magnitude of the DC voltage applied to the variable capacitance diode.
- the variable frequency diode is varied only by the bandwidth required for frequency modulation.
- a configuration in which the resonance frequency is fixed without using a variable capacitance diode in the resonance circuit 2 is applied. It is.
- the analog phase shifter 6 is applied to the voltage-controlled oscillator having the resonance circuit 2 having the fixed resonance frequency as well as the first embodiment. Effects can be achieved.
- the voltage-controlled oscillator according to the present invention is applicable to the transmission / reception devices of the microwave band and the millimeter wave band wireless communication system, radar system, and optical communication system.
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/008525 WO2005124993A1 (ja) | 2004-06-17 | 2004-06-17 | 電圧制御発振器 |
JP2006514626A JPWO2005124993A1 (ja) | 2004-06-17 | 2004-06-17 | 電圧制御発振器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/008525 WO2005124993A1 (ja) | 2004-06-17 | 2004-06-17 | 電圧制御発振器 |
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WO2005124993A1 true WO2005124993A1 (ja) | 2005-12-29 |
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PCT/JP2004/008525 WO2005124993A1 (ja) | 2004-06-17 | 2004-06-17 | 電圧制御発振器 |
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WO (1) | WO2005124993A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63138805A (ja) * | 1986-12-01 | 1988-06-10 | Fujitsu Ltd | マイクロ波発振器 |
JPH04367101A (ja) * | 1991-06-14 | 1992-12-18 | Nec Corp | Ic化発振器 |
JPH0918232A (ja) * | 1995-06-27 | 1997-01-17 | Fujitsu Ltd | マイクロ波発振器 |
JP2002261544A (ja) * | 2001-02-27 | 2002-09-13 | Mitsubishi Electric Corp | マイクロ波電圧制御発振器 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1174730A (ja) * | 1997-08-28 | 1999-03-16 | New Japan Radio Co Ltd | 周波数逓倍器 |
JP4454910B2 (ja) * | 2002-06-04 | 2010-04-21 | 三菱電機株式会社 | 半導体集積回路装置 |
JP2004056189A (ja) * | 2002-07-16 | 2004-02-19 | Mitsubishi Electric Corp | 温度補償回路付きマイクロ波発振器 |
-
2004
- 2004-06-17 JP JP2006514626A patent/JPWO2005124993A1/ja active Pending
- 2004-06-17 WO PCT/JP2004/008525 patent/WO2005124993A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63138805A (ja) * | 1986-12-01 | 1988-06-10 | Fujitsu Ltd | マイクロ波発振器 |
JPH04367101A (ja) * | 1991-06-14 | 1992-12-18 | Nec Corp | Ic化発振器 |
JPH0918232A (ja) * | 1995-06-27 | 1997-01-17 | Fujitsu Ltd | マイクロ波発振器 |
JP2002261544A (ja) * | 2001-02-27 | 2002-09-13 | Mitsubishi Electric Corp | マイクロ波電圧制御発振器 |
Non-Patent Citations (2)
Title |
---|
IKEMATSU H.: "A 40 GHz-band Fully Monolithic VCO with a One-Wave Lenght Microstrip Resonator for Accurate Oscillation Frequency.", IEEE MTT-S DIGEST., 2002, pages 843 - 846, XP001109923 * |
TAJIMA K ET AL: "2 Hansha Stab-ka Yudendo Kyoshinki Den'atsu Seigyo Hassinki.", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS., 10 September 2003 (2003-09-10), XP002996609 * |
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JPWO2005124993A1 (ja) | 2008-04-17 |
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