KR20160027767A - Apparatus for generating multi-phase signal - Google Patents

Apparatus for generating multi-phase signal Download PDF

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Publication number
KR20160027767A
KR20160027767A KR1020140116301A KR20140116301A KR20160027767A KR 20160027767 A KR20160027767 A KR 20160027767A KR 1020140116301 A KR1020140116301 A KR 1020140116301A KR 20140116301 A KR20140116301 A KR 20140116301A KR 20160027767 A KR20160027767 A KR 20160027767A
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KR
South Korea
Prior art keywords
voltage controlled
controlled oscillator
voltage
turned
input terminal
Prior art date
Application number
KR1020140116301A
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Korean (ko)
Inventor
김재준
최수빈
Original Assignee
울산과학기술원
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Priority to KR1020140116301A priority Critical patent/KR20160027767A/en
Publication of KR20160027767A publication Critical patent/KR20160027767A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/954—Proximity switches using a magnetic detector using inductive coils in a resonant circuit controlled by an oscillatory signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0231—Astable circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
    • H03K3/03—Astable circuits
    • H03K3/0315—Ring oscillators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/15—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The present invention relates to a multi-phase signal generating apparatus based on a ring structure which can be reconstructed. According to the present invention, the multi-phase signal generating apparatus can reduce power consumption by selectively turning off a voltage control oscillator not in use in response to signal generation of various phases, and can generate various phase signals necessary for broadband frequency generation by selectively reconstructing the voltage control oscillator with a ring structure.

Description

 [0001] APPARATUS FOR GENERATING MULTI-PHASE SIGNAL [0002]

The present invention relates to a frequency generating apparatus, a voltage controlled oscillator which is not used corresponding to generation of signals of various phases, selectively turns off to reduce power consumption, Phase signal generator for selectively reconfiguring a voltage-controlled oscillator of the multi-phase signal generator to generate various phase signals necessary for generating a wideband frequency.

Generally, an oscillator is an apparatus for generating an AC signal of a predetermined frequency and is used in a wireless transceiver for transmitting and receiving signals through a predetermined channel such as a mobile phone, a TV receiver, and a wireless modem.

Fig. 1 shows a schematic configuration of a conventional frequency generator.

Hereinafter, the operation of the frequency generator will be schematically described with reference to FIG. 1. In the frequency generator, an input frequency (e.g.,

Figure pat00001
(Local oscillator) 100 that receives the local oscillation frequency < RTI ID = 0.0 >
Figure pat00002
Are mixed through a mixer 102 to generate an output frequency of a desired band.

However, in the conventional frequency generator as described above, the frequency of the specific frequency (Hz) input to one side of the mixer 102

Figure pat00003
) To the local oscillation frequency (
Figure pat00004
) Are mixed to generate a desired output frequency, and the range of the output frequency is limited to a certain band.

Therefore, in order to generate a wide frequency range of various bands used in various communication apparatuses using the conventional frequency generating apparatus, it is necessary to provide a plurality of frequency generating apparatuses that generate frequencies of different phases.

However, in the case of implementing an apparatus for generating a wide frequency by providing a plurality of frequency generators as described above, there is a problem that the volume of the frequency generator is increased and the circuit becomes complicated. In addition, in the related art, only a frequency signal having one phase can be generated in the frequency generator, resulting in a problem of high power consumption if it is inefficient.

(Patent Literature)

Korean Registered Patent No. 10-0727898 (Registered Date June 07, 2007)

Accordingly, in the present invention, a voltage controlled oscillator not corresponding to signal generation of various phases is selectively turned off to reduce power consumption, and a voltage-controlled oscillator of a ring structure is selectively reconfigured to generate various phase signals Phase signal generation device capable of generating a multi-phase signal.

The present invention provides a multi-phase signal generator comprising: a plurality of voltage-controlled oscillators connected in parallel to each other in a ring structure for generating a signal of a predetermined frequency; And a mode setting unit for reconfiguring the plurality of voltage controlled oscillators into a plurality of operation modes by selectively connecting the plurality of voltage controlled oscillators and controlling the signals to have different phases according to the operation mode.

Each of the voltage-controlled oscillators includes a switch capable of controlling on or off of the voltage-controlled oscillators in the circuit.

Further, the switch is controlled so as to turn off the voltage-controlled oscillator when the voltage-controlled oscillator is not operated.

In addition, the switch is implemented as a PMOS.

The mode setting unit may control the connection of the plurality of voltage controlled oscillation periods according to the operation mode to generate the signal as signals having two different phases, four phases, or eight phases.

The plurality of voltage-controlled oscillators may include a first voltage-controlled oscillator, a second voltage-controlled oscillator, a third voltage-controlled oscillator, and a fourth voltage-controlled oscillator connected in parallel in a ring structure, The first voltage controlled oscillator of the plurality of voltage controlled oscillators is turned on and the remaining voltage controlled oscillator is turned off.

In addition, when the signal is generated by the four different phase signals, the first voltage-controlled oscillator and the second voltage-controlled oscillator of the plurality of voltage-controlled oscillators are turned on and the remaining voltage-controlled oscillator is turned off, A first EN2 input terminal connected to the output terminal of the fourth voltage controlled oscillator is turned off and a first EN2 input terminal connected to the output terminal of the second voltage controlled oscillator is turned off, The second EN1 input terminal connected to the output terminal of the first voltage controlled oscillator of the input terminal of the second voltage controlled oscillator is turned on and the second EN2 connected to the output terminal of the third voltage controlled oscillator is turned on, And the input terminal is turned off.

In addition, when the signal is generated by the eight different phase signals, the plurality of voltage controlled oscillators are all turned on, and the mode setting unit sets the mode of the fourth voltage controlled oscillator among the input terminals of the first voltage controlled oscillator. The first EN1 input terminal connected to the output terminal is turned on and the first EN2 input terminal connected to the output terminal of the second voltage controlled oscillator is turned off and the first voltage control oscillator The second EN1 input terminal connected to the output terminal of the oscillator is turned on and the second EN2 input terminal connected to the output terminal of the third voltage controlled oscillator is turned off, The third EN1 input terminal connected to the output terminal of the voltage controlled oscillator is turned on and the third EN2 input terminal connected to the output terminal of the fourth voltage controlled oscillator is turned off A fourth EN1 input terminal connected to the output terminal of the third voltage controlled oscillator of the input terminal of the fourth voltage controlled oscillator is turned on and a fourth EN2 input terminal connected to the output terminal of the first voltage controlled oscillator is turned on, Is turned off.

According to the present invention, in a reconfigurable ring structure-based multi-phase signal generator, a voltage controlled oscillator not used corresponding to signal generation of various phases is selectively turned off to reduce power consumption, The oscillator can be selectively reconfigured to generate various phase signals required for generating a wideband frequency.

In addition, if a broadband multiplier is constructed using this, it is possible to construct a broadband voltage oscillator that provides low power and low noise. Also, it can be used in other devices using multi-phase using a multi-phase signal generator, .

1 is a schematic configuration diagram of a conventional frequency generator,
2 is a detailed circuit diagram of a multi-phase signal generator according to an embodiment of the present invention,
3 is a diagram illustrating a reconstruction structure of a voltage controlled oscillator in a 4-phase mode and 8-phase mode in a multi-phase signal generator according to an embodiment of the present invention.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, 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. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 2 shows a detailed circuit configuration of a reconfigurable multiphase signal generator according to an embodiment of the present invention.

Referring to FIG. 2, the reconfigurable multi-phase signal generator 290 may be composed of a plurality of voltage-controlled oscillators connected in parallel based on a ring structure.

Each of the voltage controlled oscillators 200, 210, 220, and 230 of the polyphase signal generator is an oscillator circuit that obtains an output of a desired frequency by adjusting the voltage by adjusting the voltage. The variable capacitor diode varactor diode to resonate the frequency, oscillate and amplify the resonated frequency, and output.

On the other hand, in a conventional signal generating apparatus in which a plurality of voltage-controlled oscillators are connected in parallel to generate a frequency, a switch for selectively turning on / off each voltage-controlled oscillator is not configured, Since all the oscillators are turned on, there is a problem of power consumption.

Accordingly, in the present invention, as shown in FIG. 2, a switch 203, which may be implemented as a PMOS or the like, may be formed in an internal circuit of the voltage controlled oscillator 200 to control on / off of each voltage controlled oscillator . Accordingly, the voltage controlled oscillators 200, 210, 220, and 230, which are not used in accordance with the operation mode, are selectively used in the multi-phase signal generator 290 including the plurality of voltage controlled oscillators 200, 210, 220, So that power consumption can be reduced.

In the multi-phase signal generator 290 as shown in FIG. 2, a plurality of voltage controlled oscillators 200, 210, 220, and 230 are reconfigured based on a ring structure to operate in an operation mode corresponding to a phase to be generated. And a mode setting unit 202 for enabling the display unit 200 to display the image.

The mode setting unit 202 includes a plurality of voltage controlled oscillators 200 and 210 which are mounted to be connected to the output terminals Vo + and Vo- of the voltage controlled oscillators of the plurality of voltage controlled oscillators 200, 210, 220 and 230, 220, and 230, and generates a multi-phase signal having a phase different from that of the signals generated from the voltage-controlled oscillators 200, 210, 220, and 230 according to the operation mode. Can be controlled to be output. That is, for example, the mode setting unit 202 reconfigures the connection between the plurality of voltage controlled oscillators 200, 210, 220, and 230 according to the operation mode so that the voltage generated by the voltage controlled oscillators 200, 210, 220, The signal can be generated as a signal having two different phases, four phases, or eight phases.

2, according to the present invention, by reconfiguring the connection of each voltage-controlled oscillator in correspondence with the phase of a signal to be generated in the reconfigurable multi-phase signal generator 290, A multi-phase signal can be easily generated without separately generating a signal generating device. The multi-phase signal thus generated can be effectively used for generating a wideband frequency. In addition, a voltage controlled oscillator which is not used corresponding to signal generation of various phases can be selectively turned off to reduce power consumption.

3 illustrates a concept of generating a polyphase signal in the polyphase signal generator 290 according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG.

First, in the case of a two-phase mode in which signals having two different phases are generated, for example, four voltage-controlled oscillators, that is, a first voltage-controlled oscillator 200 and a second voltage- Only the first voltage controlled oscillator 200 is turned on in the multiphase signal generator 290 including the voltage controlled oscillator 210, the third voltage controlled oscillator 220 and the fourth voltage controlled oscillator 230, The control oscillators 210, 220, and 230 may be controlled to be turned off.

In this two-phase mode, signals having two different phases can be generated regardless of the operation of the mode setting unit 202 for controlling the input terminal signals of the voltage-controlled oscillators 200, 210, 220, and 230, In this case, the phase of the signal generated in the 2-phase mode may be 0 ㅀ, 180..

Next, in the case of a four-phase mode in which signals having four different phases are generated, a reconfigurable multi-phase signal generator 290 in which a plurality of voltage-controlled oscillators 200, 210, 220, The first voltage controlled oscillator 200 and the second voltage controlled oscillator 210 of the plurality of voltage controlled oscillators 200, 210, 220 and 230 are controlled to be turned on and the remaining voltage controlled oscillators 220 and 230 are controlled to be off .

In this four-phase mode, the mode setting unit 202 sets the EN (enable) 1 connected to the output terminals Vo +, Vo- of the fourth voltage controlled oscillator 230 among the input terminals of the first voltage controlled oscillator 200, The input terminal 204 is turned off and the EN2 input terminal 206 connected to the output terminal of the second voltage controlled oscillator 210 can be turned on.

The EN1 input terminal 214 connected to the output terminal of the first voltage controlled oscillator 200 among the input terminals of the second voltage controlled oscillator 210 is turned on and the output terminal of the third voltage controlled oscillator 220 is turned on The EN2 input terminal 216 to be connected can be turned off. In this case, the phase of the signal generated in the 4-phase mode may be 0 ㅀ, 90 ㅀ, 180 ㅀ, 270..

In the case of an 8-phase mode in which signals having eight different phases are generated, for example, a first voltage-controlled oscillator 200, a second voltage-controlled oscillator 210, and a third voltage- The voltage controlled oscillators 200, 210, 220 and 230 may be controlled to be turned on in the multi-phase signal generator 290 including the control oscillator 220 and the fourth voltage controlled oscillator 230.

In this 8-phase mode, the mode setting unit 202 turns on the EN1 input terminal 204 connected to the output terminal of the fourth voltage-controlled oscillator 230 among the input terminals of the first voltage-controlled oscillator 200, The EN2 input terminal 206 connected to the output terminal of the second voltage controlled oscillator 210 can be turned off.

The EN1 input terminal 216 connected to the output terminal of the first voltage controlled oscillator 200 among the input terminals of the second voltage controlled oscillator 210 is turned on and the output terminal of the third voltage controlled oscillator 220 is turned on The connected EN2 input terminal 216 can be turned off.

The EN1 input terminal 224 connected to the output terminal of the second voltage controlled oscillator 210 among the input terminals of the third voltage controlled oscillator 220 is turned on and the output terminal of the fourth voltage controlled oscillator 230 The EN2 input terminal 226 to be connected can be turned off.

The EN1 input terminal 234 connected to the output terminal of the third voltage controlled oscillator 220 among the input terminals of the fourth voltage controlled oscillator 230 is turned on and the output terminal of the first voltage controlled oscillator 200 The connected EN2 input terminal 236 can be turned off. In this case, the phase of the signal generated in the 8-phase mode may be 0 ㅀ, 45 ㅀ, 90 ㅀ, 135 ㅀ, 180 ㅀ, 225 ㅀ, 270 ㅀ, 315..

In connection between the voltage controlled oscillators 200, 210, 220 and 230 in the polyphase signal generator 290 in the upper 4-phase mode and the 8-phase mode, as shown in FIGS. 2 and 3, The dummy path may be connected to the input of the next stage of the ring structure voltage controlled oscillator and may be formed to be refined with a feedback path. At this time, such a dummy pass is intended to solve the problem of load balancing between stages, that is, during each voltage-controlled oscillation period.

In the present invention, in each of the voltage controlled oscillators 200, 210, 220, and 230, the signal input for the operation of the 2-phase mode, the 4-phase mode, And the signals of the EN1 and EN2 input terminals of the voltage controlled oscillators 200, 210, 220, and 230, respectively, (ENx2: x2 Enable), 4 phase mode control signal (ENx4: x4 Enable) and 8 phase mode control signal (ENx8: x8 Enable) as shown in the input table block .

4, when the two-phase mode control signal ENx2 is input, the conditions of PWR1 = ENx2 || ENx4 || ENx8 are considered, and in the multi-phase signal generator 290 of FIG. 2 Only the first voltage controlled oscillator 200 is turned on and the switch 203 of the remaining voltage controlled oscillators 210, 220 and 230 receives the switch-off signal and the remaining voltage controlled oscillator 210 , 220 and 230 are off.

Next, when the four-phase mode control signal ENx4 is input, the conditions of PWR1 = ENx2 || ENx4 || ENx8 and PWR2 = ENx4 || ENx8 are taken into account, and in the multi-phase signal generator 290 Only the first voltage controlled oscillator 200 and the second voltage controlled oscillator 210 are turned on and only the switch 203 of the third and fourth voltage controlled oscillators 220 and 230 is turned on. And the third and fourth voltage controlled oscillators 220 and 230 are turned off. An OFF signal is input to the EN1 input terminal 204 of the first voltage controlled oscillator 200 and an ON signal is input to the EN2 input terminal 206. The EN1 input terminal 204 of the second voltage- 214, and an OFF signal is input to the EN2 input terminal 216. [ It can be seen that the on / off signals at the respective terminals are the same as the on / off input signals at the four-phase mode shown in FIG.

Next, when the 8-phase mode control signal ENx8 is inputted, the conditions of PWR1 = ENx2 || ENx4 || ENx8, PWR2 = ENx4 || ENx8 and PWR4 = ENx8 are considered, A switch-on signal is input to PWR1, PWR2, and PWR4 in step 290, and the overall voltage-controlled oscillators 200, 210, 220, and 230 are turned on.

An ON signal is input to the EN1 input terminal 204 of the first voltage controlled oscillator 200 and an OFF signal is input to the EN2 input terminal 206. The second voltage control oscillator 210, The ON / OFF signals of the same pattern as those of the first voltage controlled oscillator 200 are input to the EN1 input terminal and the EN2 input terminal of the oscillator 220 and the fourth voltage controlled oscillator 230, respectively. It can be seen that the on / off signal at each terminal is the same as the on / off input signal in the 8-phase mode shown in FIG.

As described above, according to the present invention, in a reconfigurable ring structure-based multi-phase signal generator, a voltage controlled oscillator not used corresponding to signal generation of various phases is selectively turned off to reduce power consumption, A ring-shaped voltage-controlled oscillator can be selectively reconfigured to generate various phase signals necessary for generating a wideband frequency. In addition, if a broadband multiplier is constructed using this, it is possible to construct a broadband voltage oscillator that provides low power and low noise, and the multi-phase signal generator can be used in other devices using multi-phase.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should not be limited by the described embodiments but should be defined by the appended claims.

200, 210, 220, 230: voltage controlled oscillator (VCO) 202:
203: switch

Claims (8)

A plurality of voltage controlled oscillators connected in parallel with a ring structure for generating a signal of a predetermined frequency,
A plurality of voltage controlled oscillators connected to the input and output terminals of the voltage controlled oscillators and selectively reconnecting the plurality of voltage controlled oscillators to a plurality of operation modes, A mode setting unit
Phase signal generator.
The method according to claim 1,
Wherein each of the voltage-
And a switch capable of controlling ON or OFF of each of the voltage controlled oscillators in the circuit.
3. The method of claim 2,
Wherein the switch comprises:
Wherein the voltage controlled oscillator is controlled to turn off the voltage controlled oscillator when the voltage controlled oscillator is not operated.
3. The method of claim 2,
Wherein the switch comprises:
PMOS. ≪ / RTI >
The method according to claim 1,
Wherein the mode setting unit,
And controls the plurality of voltage controlled oscillation period connections according to the operation mode to generate the signal as a signal having two different phases, four phases, or eight phases.
The method according to claim 6,
Wherein the plurality of voltage controlled oscillators comprise:
A first voltage controlled oscillator, a second voltage controlled oscillator, a third voltage controlled oscillator, and a fourth voltage controlled oscillator connected in parallel in a ring structure,
Wherein when the signal is generated by the two different phase signals, only the first voltage-controlled oscillator of the plurality of voltage-controlled oscillators is turned on and the remaining voltage-controlled oscillator is turned off.
The method according to claim 6,
The first voltage control oscillator and the second voltage control oscillator of the plurality of voltage control oscillators are turned on and the remaining voltage control oscillator is off,
Wherein the mode setting unit,
The first EN1 input terminal connected to the output terminal of the fourth voltage controlled oscillator is turned off and the first EN2 input terminal connected to the output terminal of the second voltage controlled oscillator is turned off Lt; / RTI &
A second EN1 input terminal connected to the output terminal of the first voltage controlled oscillator is turned on among input terminals of the second voltage controlled oscillator and a second EN2 input terminal connected to the output terminal of the third voltage controlled oscillator is turned off Phase signal frequency generator.
The method according to claim 6,
When the signal is generated by the eight different phase signals, the plurality of voltage controlled oscillators are all turned on,
Wherein the mode setting unit,
The first EN1 input terminal connected to the output terminal of the fourth voltage controlled oscillator is turned on and the first EN2 input terminal connected to the output terminal of the second voltage controlled oscillator is turned off Lt; / RTI &
A second EN1 input terminal connected to the output terminal of the first voltage controlled oscillator is turned on among input terminals of the second voltage controlled oscillator and a second EN2 input terminal connected to the output terminal of the third voltage controlled oscillator is turned off Lt; / RTI &
The third EN1 input terminal connected to the output terminal of the second voltage controlled oscillator is turned on and the third EN2 input terminal connected to the output terminal of the fourth voltage controlled oscillator is turned off, Lt; / RTI &
A fourth EN1 input terminal connected to the output terminal of the third voltage controlled oscillator of the input terminal of the fourth voltage controlled oscillator is turned on and a fourth EN2 input terminal connected to the output terminal of the first voltage controlled oscillator is turned off Phase signal frequency generator.


KR1020140116301A 2014-09-02 2014-09-02 Apparatus for generating multi-phase signal KR20160027767A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100727898B1 (en) 2006-01-06 2007-06-14 삼성전자주식회사 Frequency synthesizing apparatus and method having injection-locked quadrature vco in rf transceiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100727898B1 (en) 2006-01-06 2007-06-14 삼성전자주식회사 Frequency synthesizing apparatus and method having injection-locked quadrature vco in rf transceiver

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
(특허문헌)

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