KR20150024682A - wide-band voltage controlled oscillator using transformer coupling and resonance mode switching - Google Patents

wide-band voltage controlled oscillator using transformer coupling and resonance mode switching Download PDF

Info

Publication number
KR20150024682A
KR20150024682A KR20130101912A KR20130101912A KR20150024682A KR 20150024682 A KR20150024682 A KR 20150024682A KR 20130101912 A KR20130101912 A KR 20130101912A KR 20130101912 A KR20130101912 A KR 20130101912A KR 20150024682 A KR20150024682 A KR 20150024682A
Authority
KR
South Korea
Prior art keywords
resonance mode
circuit
node
oscillation
transformer
Prior art date
Application number
KR20130101912A
Other languages
Korean (ko)
Other versions
KR101503505B1 (en
Inventor
이영재
Original Assignee
주식회사 알피노
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 알피노 filed Critical 주식회사 알피노
Priority to KR1020130101912A priority Critical patent/KR101503505B1/en
Publication of KR20150024682A publication Critical patent/KR20150024682A/en
Application granted granted Critical
Publication of KR101503505B1 publication Critical patent/KR101503505B1/en

Links

Images

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
    • 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
    • H03B5/1209—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 having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a 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
    • H03B5/1206—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
    • 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
    • H03B5/1296—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 feedback circuit comprising a transformer
    • 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
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/003—Circuit elements of oscillators
    • H03B2200/0058—Circuit elements of oscillators with particular transconductance characteristics, e.g. an operational transconductance amplifier

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

Disclosed is a wide-band voltage controlled oscillator using transformer coupling and resonance mode switching. A voltage controlled oscillator according to an embodiment of the present invention can be operated with low power by the cross coupling of a transformer and a current reuse structure. The communication environment of multi band and multi mode is supported by using a resonance mode switching technique.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wide-band voltage controlled oscillator using transformer coupling and resonant mode switching,

The present invention relates to a voltage controlled oscillator.

Generally, a voltage controlled oscillator (VCO) refers to an oscillator that adjusts a frequency by changing a capacitance of a variable capacitor by a voltage control. When designing a VCO, most LC tanks are used by using inductors and capacitor banks. Recently, the effect of reducing the area can be obtained by using only one inductor number through the differential inductor.

Fig. 1 is a circuit diagram of a general differential VCO 1. Fig.

1, the differential VCO 1 includes a negative transconductance circuit 12 having two transistors M2 and M3 and an oscillation circuit 10 composed of an inductor L and a capacitor C . The inductor L and the capacitor C constitute an LC tank to determine the oscillation frequency and vary the oscillation frequency by varying the capacitor. The oscillation frequency is outputted through the oscillation ports (Voutp, Voutn) of both stages differentially.

In the current wireless communication field, not only analog transceivers but also digital RF transceivers and ultimately SDR (Software Defined Radio) transceivers are evolving. One of the directions that these transceivers are seeking is to support multi-band and multi-mode. One of the most difficult parts for this is the frequency synthesizer, which must be designed to be wideband to cover all frequency ranges. To solve this problem, there is a method of using a plurality of voltage-controlled oscillators per frequency, but in this case, the area and the power consumption of the oscillator increase rapidly. Therefore, a multi-band and multimode voltage-controlled oscillator that operates with low power and small area is required.

According to one embodiment, a wideband voltage controlled oscillator using transformer coupling and resonant mode switching is proposed to support multi-band and multi-mode communication environments.

A voltage-controlled oscillator according to an embodiment includes a resonance circuit including a transformer for replacing an inductor and a plurality of capacitors to generate oscillation frequencies of a plurality of bands, and a plurality of transistors cross-coupled through a transformer, And a negative transconductance circuit that generates a negative transconductance to maintain oscillation. In this case, the transformer has a primary coil connected between the first node and the third node, a secondary coil connected between the second node and the fourth node, and the primary coil and the secondary coil connected to the center tap A plurality of capacitors are connected between the first node and the third node and between the second node and the fourth node with a first capacitor pair having the same capacitance with each other and between the first node and the second node and between the third node and the fourth node, And a second pair of capacitors having capacitances different from those of the first pair of capacitors and having the same capacitance between the nodes.

Wherein the negative transconductance circuit includes a first negative transconductance circuit that generates a first negative transconductance and a second negative transconductance circuit that generates a second negative transconductance and wherein the voltage controlled oscillator is coupled to the center tap of the transformer, The first negative transconductance circuit and the second negative transconductance circuit can each produce a negative transconductance through one current path, as the current reuse structure constitutes one current path through the first negative transconductance circuit and the second negative transconductance circuit.

The first negative transconductance circuit includes a first transistor connected between the other end of the primary coil and the bias current supply end and switching on and off in accordance with a signal applied to one end of the secondary coil, And a second transistor connected between the application terminals and switched on and off according to a signal applied to one end of the primary coil. The second negative transconductance circuit includes a third transistor connected between the power supply voltage application terminal and one end of the primary coil and switched on and off in accordance with a signal applied to the other end of the secondary coil, And a fourth transistor connected between the first coil and the second coil and being switched on and off according to a signal applied to the other end of the primary coil.

The voltage-controlled oscillator further includes a resonance-mode switching circuit that varies the manner of connecting the transconductance to the transformer so as to select a predetermined resonance mode, thereby causing the resonance circuit to generate the oscillation frequency by the selected resonance mode, thereby extending the oscillation frequency can do.

The resonance mode switching circuit can reduce the oscillation frequency by selecting the first resonance mode and increasing the value of the capacitor so that the phase of the oscillation waveform is opposite in each oscillation port of the resonance circuit. Or the resonance mode switching circuit can increase the oscillation frequency by selecting the second resonance mode and decreasing the capacitor value by causing the phase of the oscillation waveform to be in phase with each oscillation port of the resonance circuit. The resonance mode switching circuit can adjust the capacitor value in each mode so that the oscillation frequency in the first resonance mode and the oscillation frequency in the second resonance mode are continuous.

According to an exemplary embodiment, a wideband differential voltage controlled oscillator using a transformer coupling and a resonant mode switching technique can reduce the power consumption while reducing the area of the oscillator by using only a single transformer. Further, by connecting a switch to the center tap of the transformer used in the oscillator, the oscillator can be operated in various frequency bands by adjusting the value of the oscillating trans inductance. Accordingly, it is possible to operate the oscillator in multimode multi-band, and it can be applied to SDR (Software Defined Radio) transceiver as well as various transceiver designs including such oscillators.

1 is a circuit diagram of a general differential voltage controlled oscillator,
2 is a circuit diagram of a voltage-controlled oscillator according to an embodiment of the present invention,
FIG. 3 is a circuit diagram in which the voltage-controlled oscillator of FIG. 2 operates in odd mode,
4 is a circuit diagram in which the voltage-controlled oscillator of FIG. 2 operates in an even mode.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

2 is a circuit diagram of a voltage controlled oscillator (VCO) 2 according to an embodiment of the present invention.

Referring to FIG. 2, the VCO 2 according to one embodiment cross-couples the transistors M2, M3, M4, and M5 through a transformer and connects the primary coil 200-1 of the transformer and the secondary coil 200-2 are connected to the center tap (M) 210 to form one DC current path, so that the area of the VCO 2 can be reduced and current consumption can be reduced. Further, four oscillation ports P +, S +, P-, and so on are formed by forming two oscillation nodes N1 and N2 above one transformer and two oscillation nodes N3 and N4 below, S-) can be easily secured.

The VCO 2 according to one embodiment is capable of wideband oscillation using a resonant mode switching technique. To this end, after resonance mode switching circuits 24-1 and 24-2 are further connected, a desired resonance mode is selected to vary the capacitor and inductance, thereby varying the oscillation frequency, and consequently expanding the oscillation frequency have. The VCO 2 having the resonance mode switching circuits 24-1 and 24-2 described above is advantageous in terms of the area and the power consumption of the oscillator as compared with a structure using several VCOs to cover various bands.

Hereinafter, the configuration of the VCO 2 having the above-described characteristics will be described in detail with reference to FIG.

Referring to Figure 2, the VCO 2 includes a resonant circuit 20 and a negative transconductance circuit

The resonant circuit 20 includes one transformer and a plurality of capacitors, and generates oscillation frequencies of various bands. The transformer has a primary coil 200-1 connected between a first node N1 and a third node N3 and a secondary coil 200-1 connected between a second node N2 and a fourth node N4. -2), and the transformer performs a resonance operation together with a capacitor having a variable capacitance to generate an oscillation frequency, and outputs it to four oscillation ports (P +, S +, P-, S-).

In the transformer according to one embodiment, the primary coil 200-1 and the secondary coil 200-2 are connected to each other by a center tap M. The transformer forms one current path using the center tap M and the transconductance is connected to the opposite port of the transformer so that one transformer is divided into four inductors to form four oscillation ports P +, S +, P- , S-), respectively. As described above, when the resonance circuit 20 including the transformer and the capacitor is designed, the resonance circuit 20 is formed by modifying the transformer connection mode to obtain four oscillation ports P +, S +, P-, The oscillation band can be expanded without increasing the area of the oscillator.

The capacitor of the resonant circuit 20 according to one embodiment includes a first capacitor pair and a second capacitor pair. The first capacitor pair includes a first capacitor C 220-1 between the first node N1 and the third node N3 and a second capacitor C 220-1 between the second node N2 and the fourth node N4. C 220-2, and the first capacitor C 220-1 and the second capacitor C 220-2 have the same capacitance.

The second capacitor pair includes a third capacitor Cc 230-1 formed between the first node N1 and the second node N2 and a third capacitor Cc 230-1 formed between the third node N3 and the fourth node N4. The third capacitor Cc 230-1 and the fourth capacitor Cc 230-2 are formed of a first capacitor C 220-1 and a second capacitor C 220-2, -2) and have the same capacitance. The aforementioned capacitors may be a collector diode. The selector diode can vary its oscillation frequency by varying its capacitance according to the control voltage.

The negative transconductance circuit includes a number of transistors cross-coupled through a transformer to create a negative transconductance for maintaining the oscillation of the resonant circuit 20. [ The negative transconductance circuit according to one embodiment comprises a first negative transconductance circuit 22-1 for generating a first negative transconductance and a second negative transconductance circuit 22-2 for generating a second negative transconductance .

The VCO 2 according to the embodiment operates in a low power mode because the first negative transconductance circuit 22-1 and the second negative transconductance circuit 22-2 have a current reuse structure constituting one current path It is possible. That is, rather than generating two negative transconductances for oscillation respectively, as shown in FIG. 2, as the current reuse structure is used to create two negative transconductances in one current pass, the structure of the oscillator It is simple and can reduce current consumption.

The transistors M2, M3, M4 and M5 constituting the negative transconductance circuit are cross-coupled through a transformer. In detail, the first negative transconductance circuit 22-1 includes a first transistor M2 and a second transistor M3. At this time, the first transistor M2 is connected between the other end of the primary coil 200-1 of the transformer and the bias current supply terminal Nb, and is switched according to a signal applied to one end of the secondary coil 200-2. And the second transistor M3 is connected between the other end of the secondary coil 200-2 and the bias current supply terminal Nb to switch the primary coil 200-1 according to a signal applied to one end of the primary coil 200-1. Off.

The second negative transconductance circuit 22-2 includes a third transistor M4 and a fourth transistor M5. The third transistor M4 is connected between the power supply voltage terminal Vdd and one end of the primary coil 200-1 and is switched on and off according to a signal applied to the other end of the secondary coil 200-2. The fourth transistor M5 is connected between the power supply voltage terminal Vdd and one end of the secondary coil 200-2 and is switched on and off according to a signal applied to the other end of the primary coil 200-1. As described above, the VCO 2 according to one embodiment can operate at low power through cross coupling of the transformer.

The VCO 2 according to one embodiment further includes resonance mode switching circuits 24-1 and 24-2. The resonance mode switching circuits 24-1 and 24-2 vary the manner of connecting the transconductance to the transformer so as to select a predetermined resonance mode so that the resonance circuit 20 generates the oscillation frequency by the selected resonance mode Extend oscillation frequency. Through this method, an oscillator having low power and small area can be realized.

The VCO 2 according to one embodiment connects resonance mode switching circuits 24-1 and 24-2 that vary transconductance using four oscillation ports P +, S +, P-, and S-. This allows the oscillation frequency to be expanded by changing the oscillation conditions according to the conditions of the even mode or the odd mode. The resonance mode can be selected in accordance with the connection method of the negative transconductance circuits 22-1 and 22-2 and the size of the capacitor connected to the resonance circuit 20 varies depending on each case, The oscillation frequency can be extended. However, since there is no continuity of the oscillation frequency when the two modes are apart from each other, the capacitor value in each mode can be appropriately adjusted so that each mode is connected to each other in order to overcome this. A fifth transistor M1 for supplying a bias current is connected between the bias current supply terminal Nb and the ground terminal.

3 is a circuit diagram in which the VCO 2 of FIG. 2 operates in an odd mode.

3, when entering the odd mode by the resonance mode switching circuit 24-1, the phases of the oscillation waveforms at the oscillation ports are opposite to each other. Therefore, the inductance of the transformer is reduced by the mutual inductance, Has a value obtained by adding C and Cc. As the capacitor increases, the oscillation frequency decreases. Because the inductor is not physically variable to extend the oscillation frequency, the performance of the oscillator is not deteriorated and the DC current is also constant.

4 is a circuit diagram in which the VCO 2 of FIG. 2 operates in an even mode.

Referring to FIG. 4, when the resonance mode switching circuit 24-2 enters the even mode, the phase of the oscillation waveform at each oscillation port becomes in phase, so that the inductance of the transformer is increased by mutual inductance, Only C operates. When the capacitor decreases, the oscillation frequency increases.

The oscillation frequency in each mode is determined according to how the capacitor value is set. In order to continuously change the oscillation frequency, it is important how to set the overlapping frequency range in each mode. Four oscillation ports (P +, S +, P-, S-) are formed by connecting one transformer by using a center tap and resonance mode switching circuits 24-1 and 24-2 are connected to the oscillation ports (2) It can operate in multi-mode and multi-band without deterioration in performance.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (5)

A resonance circuit including a transformer for replacing an inductor and a plurality of capacitors to generate oscillation frequencies of a plurality of bands; And
A negative transconductance circuit including a plurality of transistors cross-coupled through the transformer to generate a negative transconductance for maintaining oscillation of the resonant circuit; / RTI >
The transformer has a primary coil connected between a first node and a third node, a secondary coil connected between a second node and a fourth node, and the primary coil and the secondary coil are connected to a center tap ,
Wherein the plurality of capacitors comprises a first capacitor pair having a capacitance equal to each other between a first node and a third node and between a second node and a fourth node and a second capacitor pair having a capacitance between the first node and the second node, And a second capacitor pair having capacitances different from the first capacitor pair between the nodes and having the same capacitance. 2. The circuit of claim 1, wherein the negative transconductance circuit comprises:
A first negative transconductance circuit generating a first negative transconductance; And
A second negative transconductance circuit for generating a second negative transconductance; / RTI >
Wherein the first negative transconductance circuit and the second negative transconductance circuit each convert the negative transconductance to the one current through the center tap of the transformer so that the voltage controlled oscillator has a current reuse structure that forms a current path through the center tap of the transformer, Pass through the path. The voltage controlled oscillator according to claim 1,
A resonance mode switching circuit for changing the manner of connecting the transconductance to the transformer so as to select a predetermined resonance mode, thereby causing the resonance circuit to generate the oscillation frequency by the selected resonance mode, thereby extending the oscillation frequency;
Further comprising a voltage controlled oscillator. The resonance mode switching circuit according to claim 3,
The first resonance mode is selected and the oscillation frequency is decreased by increasing the capacitor value so that the phases of the oscillation waveforms are opposite to each other in the oscillation ports of the resonance circuit, or the second resonance mode is selected, And the oscillation frequency is increased by decreasing the value of the capacitor so that the phase of the oscillation waveform is in phase with the oscillation port. The method of claim 3,
Wherein the resonance mode includes a first resonance mode and a second resonance mode,
The resonant mode switching circuit includes:
And the capacitor value in each resonance mode is adjusted so that the oscillation frequency in the first resonance mode and the oscillation frequency in the second resonance mode are continuous.
KR1020130101912A 2013-08-27 2013-08-27 wide-band voltage controlled oscillator using transformer coupling and resonance mode switching KR101503505B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130101912A KR101503505B1 (en) 2013-08-27 2013-08-27 wide-band voltage controlled oscillator using transformer coupling and resonance mode switching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130101912A KR101503505B1 (en) 2013-08-27 2013-08-27 wide-band voltage controlled oscillator using transformer coupling and resonance mode switching

Publications (2)

Publication Number Publication Date
KR20150024682A true KR20150024682A (en) 2015-03-09
KR101503505B1 KR101503505B1 (en) 2015-03-18

Family

ID=53021211

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130101912A KR101503505B1 (en) 2013-08-27 2013-08-27 wide-band voltage controlled oscillator using transformer coupling and resonance mode switching

Country Status (1)

Country Link
KR (1) KR101503505B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4044427A4 (en) * 2019-10-31 2022-11-02 Huawei Technologies Co., Ltd. Oscillator circuit
CN115361033A (en) * 2022-08-18 2022-11-18 百瑞互联集成电路(上海)有限公司 Broadband dual-mode voltage-controlled oscillator and radio frequency transceiver

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100952424B1 (en) * 2008-02-21 2010-04-14 한국전자통신연구원 The Differential VCO and quadrature VCO using center-tapped cross-coupling of transformer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4044427A4 (en) * 2019-10-31 2022-11-02 Huawei Technologies Co., Ltd. Oscillator circuit
US11757406B2 (en) 2019-10-31 2023-09-12 Huawei Technologies Co., Ltd. Oscillator circuit
CN115361033A (en) * 2022-08-18 2022-11-18 百瑞互联集成电路(上海)有限公司 Broadband dual-mode voltage-controlled oscillator and radio frequency transceiver
CN115361033B (en) * 2022-08-18 2023-12-19 百瑞互联集成电路(上海)有限公司 Broadband dual-mode voltage-controlled oscillator and radio frequency transceiver

Also Published As

Publication number Publication date
KR101503505B1 (en) 2015-03-18

Similar Documents

Publication Publication Date Title
US8436689B2 (en) Multiple phase voltage controlled oscillator including a resonant circuit and negative resistance circuit
US8125282B2 (en) Dual-band coupled VCO
RU2416132C2 (en) Integral version of variable inductance coil
EP2659584B1 (en) Wideband multi-mode vco
US20220360219A1 (en) Radio frequency oscillator
US20080012654A1 (en) Linearized variable-capacitance module and lc resonance circuit using the same
US8264293B2 (en) Oscillator
JP2009296375A (en) Digitally controlled oscillator and phase-locked loop circuit employing the same
SG189487A1 (en) Integrated circuit architecture with strongly coupled lc tanks
KR101503505B1 (en) wide-band voltage controlled oscillator using transformer coupling and resonance mode switching
US7227425B2 (en) Dual-band voltage controlled oscillator utilizing switched feedback technology
JP2012253561A (en) Voltage-controlled oscillator
US7170355B2 (en) Voltage-controlled oscillator using current feedback network
Li et al. A broadband low phase noise 12.4–15.4 GHz CMOS voltage controlled oscillator
CN116886046B (en) Voltage-controlled oscillating circuit
KR20160112413A (en) Muti phase mode vco circuit using transformer and configurable multi phase mode based on ultra wide band ring vco using dual ring structure
Fan et al. Transformer-based dual-mode VCO for multi-mode multi-standard receiver
Mishra et al. Design And Optimization of Low Frequency Pushing Circuit in Voltage Controlled Oscillators
JP2011010103A (en) Voltage controlled oscillation circuit
US20140176244A1 (en) Voltage-controlled oscillator with high loop gain

Legal Events

Date Code Title Description
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee