WO2002056456A1 - Oscillateur - Google Patents
Oscillateur Download PDFInfo
- Publication number
- WO2002056456A1 WO2002056456A1 PCT/JP2002/000015 JP0200015W WO02056456A1 WO 2002056456 A1 WO2002056456 A1 WO 2002056456A1 JP 0200015 W JP0200015 W JP 0200015W WO 02056456 A1 WO02056456 A1 WO 02056456A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inductor
- oscillation
- oscillation device
- oscillator
- semiconductor substrate
- Prior art date
Links
Classifications
-
- 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
- H03B27/00—Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
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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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
- H03B5/1212—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
- H03B5/1215—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair
-
- 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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1228—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more field effect transistors
-
- 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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
- H03B5/1246—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising transistors used to provide a variable capacitance
- H03B5/1253—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising transistors used to provide a variable capacitance the transistors being field-effect transistors
Definitions
- the present invention relates to an oscillation device.
- the oscillator was not mounted as a single component on the mobile device, but other functional components were mounted on the substrate of the semiconductor device provided in the mobile device. It is performed to form with it.
- FIG. 6 is a circuit diagram of a conventional differential oscillator formed on a semiconductor substrate.
- One end of each of the differential oscillators 100 shown in FIG. 6 is commonly connected to a power supply VDD.
- a first LC tank consisting of an inductor 1 1 1—1 and a capacitor 1 1—2—1 with their other ends connected to each other, and one end connected to the power supply V DD and the other end connected.
- a second LC tank consisting of an interconnected duct 1 1 1-2 and a capacity 1 1 2-2.
- this differential oscillator includes an NM ⁇ S transistor 1 13 -1 disposed between the connection point of the inductor 1 1 1 -1 and the capacitor 1 1 2 -1 and the ground GND; An NM ⁇ S transistor 113-2 disposed between a connection point of the inductor 1111-2 and the capacitor 1122-2 and the ground GND is provided.
- the gate of the NMOS transistor 113-1 is connected to the connection point between the inductor 111-2 and the capacitor 112-2.
- the gate of the NMOS transistor 113__2 is connected to the connection point between the inductor 111-1-1 and the capacitor 111-1-1.
- the differential oscillator 100 the first LC tank and the second LC tank are connected to the NMOS transistor 1 13—2 and 1 13—1 in a cross-coupled manner.
- oscillation signals I— and I + out of phase with each other by 180 ° are output.
- N MOS Transient evening 1 1 3 1 and 1 1 3 2 are 1 1 1—1, 1 1 It plays a role in compensating for the energy loss caused by the parasitic resistance of 1-2, and has a gain sufficient to compensate for this energy loss.
- various methods have been proposed for forming the inductors 1 1 1 1 and 1 1 1-2, the differential oscillator 1 100 uses a standard CMOS process to implement the inductor 1 1 1-1 and 1 1 1-2. Since 11-1 and 11-2 are formed on a silicon substrate, there is an advantage that the manufacturing cost can be reduced.
- FIG. 7 is a diagram showing an inductor formed on a silicon substrate in the differential oscillator shown in FIG.
- FIG. 6 shows two inductors 1 1 1—1 and 1 1 1—2
- FIG. 7 shows one of the two inductors 1 1 1—1 and 1 1 1—2. (Referred to as inductor 111) is shown as a representative.
- FIG. 7 (a) shows a top view of a spiral inductor (on-chip inductor) 1 1 1.
- FIG. 7B shows a cross-sectional view of the inductor 111.
- the inductor 1 1 1 is formed by arranging a spiral conductive pattern 1 1 1 a in an insulating layer 1 2 2 provided on a silicon substrate 1 2 1. ing.
- the inductor 111 formed in this way has the resistance component R1 of the helical conductor pattern 111a.
- Capacity evening 1 1 1 b having a parasitic capacitance C s are present.
- the silicon substrate 121 has a substrate resistance 111c having a resistance value Rs.
- the capacitors 1 12-1 and 1 1-2-2 constituting the differential oscillator 100 are devices having a so-called voltage-controlled variable capacitance whose capacitance value changes according to an applied voltage. If a varactor or the like is used, a voltage controlled oscillator (VCO) that outputs an oscillation signal having an oscillation frequency corresponding to the control voltage can be realized.
- VCO voltage controlled oscillator
- one end of each of the capacitors 1 1 2—1 and 1 1 2—2 is connected to the power supply V DD , but in the case of the voltage controlled oscillator, the capacitors 1 1 2—1 and 1 1 2—2 May be connected to terminals of the variable capacitance control signal.
- FIG. 8 is a diagram showing a small signal equivalent circuit for the oscillation signal I + in FIG.
- vi represents a small signal potential of the oscillation signal I +.
- the oscillation signal I— is input to the gate of the NMOS transistor 113-1, and the small signal current 1 V ig m generated by the gain g m , the capacitance value C inductance value of I Ndaku evening surrounded by a broken line L, the resistance component R 1, parasitic capacitance C s, is expressed by the substrate resistance R s.
- the voltage controlled oscillator in order to widen the range of the variable frequency, it is necessary to keep capacitance values other than the capacitance value C of Barack as small as possible.
- FIG. 9 is a diagram showing an equivalent circuit of the voltage-controlled oscillator shown in FIG. 8 when the silicon substrate has a sufficiently large fan value.
- the current required for oscillation is considered to be proportional to the gain g m of the transistor required to keep oscillating.
- the gain g m required for oscillation is
- oscillation device is incorporated in, for example, a down-comparison unit of a receiver and is used as an image signal processing device when converting a high-frequency radio signal into a low-frequency radio signal.
- FIG. 10 is a diagram showing a conventional Qaadratre oscillating device.
- the Quadrature oscillator 110 shown in Fig. 10 is an oscillation proposed in the document "IEJ. Of Solid-State Circuits, April 1998
- This oscillation device 110 is provided with two differential oscillation devices 100 shown in Fig. 6 described above, and among the two differential oscillation devices 100
- the NMOS transistors 1 1 3—3 and 1 1 3—4 are provided in parallel with the NMOS transistors 1 1 3—1 and 1 1 3—2 that constitute the left differential oscillator 100.
- the NMOS transistors 1 1 3 _ 5 and 1 1 3 — 6 are provided in parallel with the NMOS transistors 1 1 3 — 1 and 1 1 3 2 that constitute the differential oscillator 100 on the right side.
- transistors 1 1 3—3 and 1 1 3—4 are connected to the NMOS transistors 1 1 3—1 and 1 1 3—2 that constitute the right-side differential oscillator 100, respectively.
- the gates of the NMOS transistors 1 1 3—5, 1 1 3—6 are connected to the NMOS transistors 1 1 3—2, These are connected to the respective gates of 1 13-1 1.
- each of the two NMOS transistors 1 13-1 and 1 13-2 is referred to as a differential loss compensation transistor.
- the NMO S transistors 1 1 3 1 3 1 1 3—4, 1 1 3—5, 1 1 3 1 6 are referred to as Q uadrature phase holding transistors
- the signal Q + of the quadrature oscillator 1 110 , Q—, I +, 1 _ represent the voltages V (Q +), V (Q—), V (1 +), and V (I _) It is.
- V (Q + ) j V (I + )
- V (I _) -V (I +)
- V (Q—) -j V (I +)
- FIG. 11 shows the oscillation signal I + of the Quadrature oscillator shown in Fig. 10.
- FIG. 5 is a diagram showing a small signal equivalent path for the same.
- the oscillation signal I + small signal voltage V of; the oscillation signal I- is input to the gate of the differential-type loss compensation transistor, the small signal current that generates the gain g m alpha one V ig m Q! And the oscillation signal Q— are input to the gate of the above-mentioned quadrature phase holding transistor, and the small signal current generated by the gain g m 3 + — j V i gm ⁇ Capacity value.
- the inductance value L and the resistance component R 1 of the inductor Since the substrate resistance R s below the inductor is sufficiently large, the parasitic capacitance C s and the substrate resistance R s are not shown.
- the oscillation frequency ⁇ when the quadrature oscillator 110 is driven by a small signal Is, as shown in equation (8),
- the desired oscillation frequency ⁇ If we try to get the oscillation frequency ⁇ . Inductance having an inductance value L commensurate with is used. However, since the inductor has a parasitic resistance component, it is necessary to maintain oscillation by supplying a current of a magnitude commensurate with the magnitude of the parasitic resistance component. Thus, in the oscillation device, the parasitic resistance component of the inductor has a large effect on the current required to maintain oscillation, and there is a problem in reducing the power consumption of the oscillation device. Disclosure of the invention
- the present invention has been made in view of the above circumstances, and has as its object to provide an oscillation device in which power consumption is reduced.
- the oscillation device of the present invention that achieves the above object constitutes a closed circuit by being connected in series. It is characterized by having four inductors and four capacitors each having one end connected to each node which is a connection point between the above-mentioned inductors and the other end each being held at a DC potential. The other ends may be maintained at the same DC potential, but need not be so, and may be maintained at different DC potentials.
- a capacitor having a variable capacitance value is used. In this case, the DC potential connected to the capacitor may be replaced with a variable capacitance control signal.
- the oscillation device of the present invention has the above-mentioned four inductors and the above-mentioned four capacitors, as described in an embodiment to be described later, the oscillation of the inductor constituting the conventional oscillation device will be described.
- an inductor having an inductance value larger than the inductance value oscillation can be performed at the same oscillation frequency as that of a conventional oscillation device.
- an inductor having a large inductance value can reduce the effective parasitic resistance component, the current for maintaining the oscillation can be suppressed to be small, and thus the power consumption can be reduced.
- the oscillation device is formed on a semiconductor substrate. Further, it is preferable that the inductor is formed of one or more layers of a conductor formed on the semiconductor substrate.
- the oscillation device further includes a differential loss compensation transistor and a phase holding transistor at each of the nodes, thereby stabilizing oscillation and maintaining a phase difference.
- the oscillation frequency of the oscillation device can be controlled by the change in the capacitance value.
- VCO voltage controlled oscillator
- One end of the capacitor whose capacitance value changes according to the control signal is connected to a node which is a connection point between the inductors, and the other end is a signal for controlling the capacitance value. May be connected.
- At least a region below the inductor of the semiconductor substrate may have a higher substrate resistance value than a region other than the region.
- a shallow trench isolation may be embedded in at least a region of the semiconductor substrate below the inductor.
- the parasitic capacitance between the inductor and the semiconductor substrate can be reduced.
- the opening-to-trench isolation may be formed in a lattice shape.
- the shallow trench isolation is formed in a lattice pattern, current on the surface of the semiconductor substrate is blocked, and the substrate resistance can be increased.
- At least a region directly below the inductor of the semiconductor substrate may be formed by preventing implantation of impurities.
- FIG. 1 is a circuit diagram of an oscillation device according to one embodiment of the present invention.
- Fig. 2 shows the equivalent circuit of the LC tank of the conventional oscillator and the oscillator shown in Fig. 1.
- FIG. 4 is a diagram showing a comparison with an equivalent circuit of an LC tank.
- FIG. 3 is a diagram showing an inductor formed on a silicon substrate of the oscillation device shown in FIG.
- FIG. 4 is a diagram showing a small signal equivalent circuit of the oscillation device shown in FIG.
- FIG. 5 is a diagram showing a small signal equivalent circuit equivalent to the small signal equivalent circuit shown in FIG. 4 for the oscillation signal 1+.
- FIG. 6 is a circuit diagram of a conventional differential oscillator formed on a semiconductor substrate.
- FIG. 7 is a diagram showing an inductor formed on a silicon substrate in the differential oscillator shown in FIG.
- FIG. 8 is a diagram showing a small signal equivalent circuit of the differential oscillator shown in FIG.
- FIG. 9 is a diagram showing an equivalent circuit of the oscillation device shown in FIG. 8 when the resistance value of the silicon substrate is sufficiently large.
- FIG. 10 is a diagram showing a conventional Qaadratre oscillating device.
- FIG. 11 is a diagram showing a small-signal equivalent circuit of the Qadrattur oscillator shown in FIG. 10.
- FIG. 1 is a circuit diagram of an oscillation device according to one embodiment of the present invention.
- Qu Adrature oscillation apparatus shown in FIG. 1 (hereinafter, simply referred to as oscillator) to 1 0, Capacity evening 1 2_1 each end of which is commonly connected to the power supply V DD, 1 2- 2, 1 2- 3, 1 One end is connected to each node N 1, N 2, N 3, N 4 which is the other end of each of the capacities 1 2— 1, 1 2— 2, 1 2— 3, 1 2— 4.
- Connected inductors 11-1, 1, 11_2, 11_3, 11-4 are provided.
- the oscillator 10 includes NMOS transistors 13-2, 13-3, 13-6, 1 between each of the nodes N1, N2, N3, N4 and the ground GND. 3 — ⁇ (corresponding to the differential loss compensating transistor according to the present invention) and the NMOS transistor 13-1, 13-4, 13-5, 13-8 (phase holding according to the present invention) (Corresponding to a transistor night).
- the gates of the NMOS transistors 13-1, 13_4, 13-5, and 13-8 are connected to the other ends of the inductors 1-1-1, 11-2, 11-3, and 11-4, respectively. It is connected.
- the gates of the NMOS transistors 13-2, 13-3, 13-6, and 13-7 are connected (cross-coupled) to the nodes N2, N1, N4, and N3.
- node N1 is connected to the gate of the NMOS transistor 13__5, and the node N2 is connected to the gate of the NMOS transistor 1338.
- node N3 is Node 13-4 is connected to the gate, and Node N 4 is connected to the gate of NMO Transistor 13-1.
- the NMOS transistors 13-2, 13-3, 13-3, 13-3-7 are the parasitic resistances of the inductors 11-1-1, 11-2, 11-3, 11-4 It plays a role in compensating for the energy loss caused by energy. Further, the NMOS transistors 13-2 and 13-3 hold the signals ⁇ + and I- of the oscillator 10 so that the phases thereof are shifted 180 degrees from each other, and the NMOS transistors 13-6 and 1 Reference numeral 3-7 plays a role in causing the signals Q + and Q of the oscillator 10 to be out of phase with each other by 180 degrees.
- the NM OS transistors 13_1, 13-4, 13-5, and 13-8 are 90 degrees out of phase with the signals Q + , Q_, I +, and I— of the oscillator 10. It has a role to keep.
- Constant current sources 14-1, 14-2, 14-3, and 144 are respectively connected between the nodes Nl, N2, N3, and N4 and the power supply VDD . If the oscillating frequency is controlled using a varactor whose capacitance changes according to the control signal voltage as the capacitors 12-1, 12-2, 12-3, and 12-4, the voltage control oscillation A device (VCO; Voltage Controlled Oscillator) is obtained.
- VCO Voltage Controlled Oscillator
- FIG. 2 is a diagram showing a comparison between an equivalent circuit of the LC tank of the conventional oscillator and the equivalent circuit of the LC tank of the oscillator shown in FIG.
- the LC tank of a conventional oscillator is composed of an inductor 11 1 and a capacitor 11 2 that have one end commonly connected to the power supply V DD and the other end connected to each other.
- the oscillator 10 of the present embodiment has four inductors 11-1-1, 11-3, and 11-2 connected in series to form a closed circuit. , 1 1—4 and each of the nodes N l, N 3, N 2, and N 4, which are the connection points between the inductors, are connected at one end, and the other ends are held at the power supply V DD. It has four capacities 1 2— 1, 1 2— 3, 1 2 — 2, and 1 2—4.
- FIG. 3 shows the inductor formed on the silicon substrate of the oscillator shown in Fig. 1.
- FIG. 3 shows four inductors 1 1—1, 1 1—2, 1 1 _ 3 and 1 1—4.
- four inductors 1 1—1 and 1 1—2 One of the inductors (referred to as Inductor 11) out of 11_3 and 11-4 is shown as a representative.
- FIG. 3A shows a top view of the spiral inductor 11.
- FIG. 3B shows a cross-sectional view of the inductor 11.
- the inductor 11 is formed of a two-layer conductor pattern 11a in an insulating layer 22 provided on a silicon substrate 21.
- At least a region below the inductor 11 of the silicon substrate 21 is set to have a higher substrate resistance value than regions other than the region.
- at least a region below the inductor 11 of the silicon substrate 21 is filled with a trench isolation.
- the shallow trench isolation is formed in a lattice.
- At least a region directly below the inductor 11 of the silicon substrate 21 may be formed by preventing impurity implantation. In this way, the resistivity of the silicon substrate 21 may be increased. Further, a shallow trench isolation may be embedded in the entire area below the inductor 11.
- FIG. 4 is a diagram illustrating a small-signal equivalent circuit of the oscillation device illustrated in FIG. 1 with respect to the oscillation signal I + .
- the oscillation signal I + small signal V; and the oscillation signal 1 _ is input to the gate of the differential loss compensation transistor, the small signal generated by the gain g m a a current one V ig m a, the oscillation signal Q- is input to the gate of the Q Uadrature phase holding transistors, small signal current generated by the gain g m / 3 - and j V ig m beta, capacity evening capacity It is represented by the value C, the inductance value L of the inductance, and the resistance component R 1. However, since the resistance value R s of the silicon substrate below the ingot is sufficiently large, the substrate resistance value R s and the parasitic capacitance C s are not shown.
- This equivalent circuit is equivalent to the small signal equivalent circuit shown in FIG. 5 below for the oscillation signal 1+.
- the oscillation frequency in the present embodiment is twice as large as that of the conventional technology.
- the gain g m of the transistor required to maintain the oscillation is equal to each other, as shown in Expression (5) in the prior art and Expression (9) in the present embodiment.
- the advantage of the present embodiment is that the on-chip inductor whose inductance value is twice as large as that of the conventional technology is required to realize the same oscillation frequency, as is clear from the comparison between Expressions (8) and (12). Can be used.
- an inductor with a larger inductance value (L value) can reduce the effective parasitic resistance component. However, power consumption can be reduced.
- the value of the gain g m required for the transistor can be suppressed to 1 Z 2 to 1/4.
- the amount of current that must be applied to maintain oscillation can be considered to be proportional to the value of the required gain g m , so that power consumption can be reduced to 1/2 to 1/4. become.
- the four capacitors may be connected to the terminal of the capacitance control signal instead of the DC potential.
- the differential loss compensation transistor and the phase holding transistor are described using the NMOS transistor.
- the differential MOS transistor may be a PMOS transistor or a bipolar transistor.
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02729514A EP1363390A4 (en) | 2001-01-10 | 2002-01-08 | OSCILLATOR |
US10/250,426 US7034626B2 (en) | 2001-01-10 | 2002-01-08 | Oscillator with closed series of four inductors and four capacitors with connecting nodes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-2149 | 2001-01-10 | ||
JP2001002149A JP4669130B2 (ja) | 2001-01-10 | 2001-01-10 | 発振装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002056456A1 true WO2002056456A1 (fr) | 2002-07-18 |
Family
ID=18870698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/000015 WO2002056456A1 (fr) | 2001-01-10 | 2002-01-08 | Oscillateur |
Country Status (4)
Country | Link |
---|---|
US (1) | US7034626B2 (ja) |
EP (1) | EP1363390A4 (ja) |
JP (1) | JP4669130B2 (ja) |
WO (1) | WO2002056456A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2405040A (en) * | 2003-08-13 | 2005-02-16 | Agilent Technologies Inc | A VCO with a multi-layer inductor, for use in a high-speed SERDES serial data link |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US6806779B1 (en) * | 2002-12-20 | 2004-10-19 | Berkana Wireless, Inc. | Frequency synthesizer with on-chip inductor |
KR100523802B1 (ko) | 2003-08-11 | 2005-10-25 | 학교법인 한국정보통신학원 | 소스 단자의 병렬 커플링을 이용한 4위상 전압 제어 발진기 |
KR100615552B1 (ko) * | 2004-06-01 | 2006-08-25 | 학교법인 한국정보통신학원 | 직렬 교차 연결된 상보형 트랜지스터를 이용한 전압 제어발진기 및 이를 이용한 신호 송수신 장치 |
JP3954059B2 (ja) * | 2004-10-21 | 2007-08-08 | シャープ株式会社 | 発振器、通信装置 |
DE102004058300B4 (de) * | 2004-12-02 | 2016-09-15 | Austriamicrosystems Ag | Schaltungsanordnung zur Erzeugung eines komplexen Signals und Verwendung in einem Hochfrequenz-Sender oder -Empfänger |
US7414484B2 (en) * | 2005-09-29 | 2008-08-19 | Altera Corporation | Voltage controlled oscillator circuitry and methods |
KR100756031B1 (ko) | 2006-04-10 | 2007-09-05 | 삼성전기주식회사 | 커플링 캐패시터를 포함한 4위상 전압제어발진기 |
TW200910755A (en) * | 2007-08-31 | 2009-03-01 | Univ Nat Taiwan | High-frequency ring coupler |
US8362853B2 (en) * | 2009-06-19 | 2013-01-29 | Qualcomm Incorporated | Tunable MEMS resonators |
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US2556296A (en) * | 1949-04-26 | 1951-06-12 | Bell Telephone Labor Inc | High-frequency transistor oscillator |
US5629652A (en) * | 1996-05-09 | 1997-05-13 | Analog Devices | Band-switchable, low-noise voltage controlled oscillator (VCO) for use with low-q resonator elements |
WO2000072446A1 (en) * | 1999-05-26 | 2000-11-30 | Broadcom Corporation | Integrated vco |
US7555263B1 (en) * | 1999-10-21 | 2009-06-30 | Broadcom Corporation | Adaptive radio transceiver |
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2001
- 2001-01-10 JP JP2001002149A patent/JP4669130B2/ja not_active Expired - Lifetime
-
2002
- 2002-01-08 US US10/250,426 patent/US7034626B2/en not_active Expired - Lifetime
- 2002-01-08 EP EP02729514A patent/EP1363390A4/en not_active Withdrawn
- 2002-01-08 WO PCT/JP2002/000015 patent/WO2002056456A1/ja not_active Application Discontinuation
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JPH10126120A (ja) * | 1996-10-22 | 1998-05-15 | Advantest Corp | 共振器並びにその共振器を用いた発振器およびフィルタ |
JPH118357A (ja) * | 1997-04-23 | 1999-01-12 | Toshiba Corp | 半導体集積回路装置およびその製造方法 |
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Title |
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CHI-WA LO; LUONG, H.C.: "2-V 900-MHz quadrature coupled LC oscillators with improved amplitude and phase matchings", CIRCUITS AND SYSTEMS 1999. ISCAS '99 PROCEEDINGS OF THE 1999 IEEE INTERNATIONAL SYMPOSIUM, vol. 2, 1999, pages 585 - 588, XP002950511 * |
See also references of EP1363390A4 * |
SHOJIRO NAKAHARA ET AL.: "Shuchu teisuka 4GHz branch-line coupler", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, ZENKOKU TAIKAI KOEN RONBUNSHU 3, 6 March 1972 (1972-03-06), pages 721, XP002952423 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2405040A (en) * | 2003-08-13 | 2005-02-16 | Agilent Technologies Inc | A VCO with a multi-layer inductor, for use in a high-speed SERDES serial data link |
US6943636B2 (en) | 2003-08-13 | 2005-09-13 | Agilent Technologies, Inc. | Oscillator for SERDES |
GB2405040B (en) * | 2003-08-13 | 2006-12-06 | Agilent Technologies Inc | Improved oscillator for serdes |
Also Published As
Publication number | Publication date |
---|---|
US20040061563A1 (en) | 2004-04-01 |
EP1363390A1 (en) | 2003-11-19 |
EP1363390A4 (en) | 2006-03-15 |
US7034626B2 (en) | 2006-04-25 |
JP2002208818A (ja) | 2002-07-26 |
JP4669130B2 (ja) | 2011-04-13 |
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