KR20160112413A - Muti phase mode vco circuit using transformer and configurable multi phase mode based on ultra wide band ring vco using dual ring structure - Google Patents

Muti phase mode vco circuit using transformer and configurable multi phase mode based on ultra wide band ring vco using dual ring structure Download PDF

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KR20160112413A
KR20160112413A KR1020150038114A KR20150038114A KR20160112413A KR 20160112413 A KR20160112413 A KR 20160112413A KR 1020150038114 A KR1020150038114 A KR 1020150038114A KR 20150038114 A KR20150038114 A KR 20150038114A KR 20160112413 A KR20160112413 A KR 20160112413A
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South Korea
Prior art keywords
vco
phase
transformer
frequency
circuit
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KR1020150038114A
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Korean (ko)
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김재준
최수빈
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울산과학기술원
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Publication of KR20160112413A publication Critical patent/KR20160112413A/en

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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
    • 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
    • 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
    • H03B5/1218—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 generator being of the balanced type
    • 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

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Abstract

Provided is a multi-mode CDC and RDC circuit, which comprises: a first voltage controlled oscillator (VCO) for changing an oscillation frequency with input voltage; a second VCO connected to the first VCO to have an in-phase or an anti-phase structure; a third VCO connected to the first VCO with a quadrature structure; and a fourth VCO connected to the third VCO to have the in-phase or the anti-phase structure. According to the present invention, a frequency in all bands can be covered with one structure.

Description

[0001] The present invention relates to a multi-phase mode VCO circuit, and more particularly, to a multi-phase mode VCO circuit having a multi-

The present invention relates to a multiphase mode VCO circuit, and more particularly to a multiphase mode VCO circuit capable of covering a plurality of frequency bands with a circuit using an in-phase and an anti-phase structure and a quadrature structure. .

A VCO (Voltage Controlled Oscillator) is a device that generates a linearly varying output frequency in response to a change in input voltage. The VCO is divided into an oscillator for outputting a sine wave and an oscillator for outputting a square wave . An oscillator that outputs a sine wave uses elements such as RC, LC, or crystal that are frequency-selective to the frequency in the feedback loop. VCO can be divided into LC-VCO and Ring-VCO depending on the structure. The LC-VCO uses the resonance between the inductor and the capacitor to generate the oscillating frequency.

At this time, the ring voltage controlled oscillator is configured to be able to find a desired frequency even if the frequency changes due to the current change. In this regard, Korean Patent Laid-Open Publication No. 2011-0055093 (published May 25, 2011) discloses a technique of generating a current according to a trimming digital signal for trimming a frequency, adjusting the magnitude of the generated current through a resistor, And the oscillation frequency is controlled in accordance with the sum of the digital current and the analog current.

However, in such a ring voltage controlled oscillator, it is possible to generate a frequency of 2 or 4 times when generating a frequency by using a bartacker, but can not output a frequency covering the frequency band therebetween. Further, there is not disclosed a circuit in which a structure for widening various phase modes and frequency bands is implemented as a single structure.

Korean Patent Publication No. 2011-0055093 (published May 25, 2011) discloses an "oscillator. &Quot;

An embodiment of the present invention can output frequencies in various phases using an in-phase structure and an anti-phase structure. By implementing a transformer with an inductor, the frequency band range due to mutual inductance can be widened and a quadrature structure Phase mode VCO circuit capable of selectively widening the frequency using the inductor and covering the frequency between the frequencies according to the drainage by using the inductor. It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a VCO having a first VCO for varying an oscillation frequency with an input voltage, an In-phase or an Anti-phase ) Structure, a third VCO connected to the first VCO in a quadrature structure, and a fourth VCO connected to the third VCO in an in-phase or anti-phase structure.

According to any of the above-mentioned objects of the present invention, it is possible to cover the frequency of all bands in one structure.

1 is a circuit diagram illustrating a multi-phase mode VCO circuit according to an embodiment of the present invention.
2 is a circuit diagram for explaining a first VCO included in the multi-phase mode VCO circuit shown in FIG.
3 is a circuit diagram for explaining the in-phase and anti-phase structures of the first VCO and the second VCO included in the multi-phase mode VCO circuit shown in FIG.
FIG. 4 is a circuit diagram for explaining an operation process of the in-phase and anti-phase structures shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram illustrating a multi-phase mode VCO circuit according to an embodiment of the present invention. Referring to FIG. 1, a multi-phase mode VCO circuit 1 may include a first VCO 100, a second VCO 200, a third VCO 300, and a fourth VCO 500.

The multiphase mode VCO circuit 1 according to an embodiment of the present invention includes a structure that uses a transformer using an inductor and increases a frequency range by changing an inductance of an inductor used as a transformer, (2f o , 4f o ) of twice or four times the original frequency (f o ) by using a quadrature structure. The multi-phase mode VCO circuit 1 according to an embodiment of the present invention can be implemented at a time using a dual ring structure when frequency doubling and quadrupling are widened.

In addition, the multi-phase mode VCO (Voltage Controlled Oscillator) circuit 1 according to an embodiment of the present invention can be applied to a single frequency f (n) using an in-phase structure and an anti- (f o - ) with respect to the input signal ( o + ). Therefore, the multi-phase mode VCO circuit 1 according to the embodiment of the present invention can use all of the six frequency bands f o + f o - , 2f o + , 2f o - , 4f o + , 4f o - ) can be used.

Here, the multiphase mode VCO circuit 1 according to an embodiment of the present invention can increase the frequency band by changing the inductance by using a transformer and increase the frequency band of the first VCO 100 to the fourth VCO 400 When implemented at less than one-half of the maximum frequency, the frequency can be doubled or quadrupled using a multiplier to cover the frequency spacing between two and four times the frequency, Lt; RTI ID = 0.0 > frequency. ≪ / RTI >

Referring to FIG. 1, the first VCO 100 may vary an oscillation frequency with an input voltage.

The second VCO 200 may be connected to the first VCO 100 to have an in-phase or an anti-phase structure.

The third VCO 300 may be connected to the first VCO 100 in a quadrature structure.

The fourth VCO 400 may be connected to the third VCO 300 to have an in-phase or anti-phase structure. Here, the circuits of the first VCO 100 to the fourth VCO 400 are all the same, and only the connection structures of the first VCO 100 to the fourth VCO 400 may be different. The first to fourth VCOs 100 to 400 may be formed of a VCO circuit using a dual ring structure.

Each of the first to fourth VCOs 100 to 400 includes a transformer. The transformer can adjust the mutual inductance and change the frequency by using an inductor. The outputs of the first to fourth VCOs 100 to 400 of the first VCO 100 to the fourth VCO 400 may each have a phase difference of 180 degrees.

The output frequencies of the first to fourth VCOs 100 to 400 are determined based on the inductance of the inductors included in the first to fourth VCOs 100 to 400 and the capacitances of the blazers. can do.

In accordance with an embodiment of the present invention, the multiphase mode VCO circuit 1 may increase the usable frequency bandwidth using an in-phase or anti-phase structure and the quadrature structure.

FIG. 2 is a circuit diagram illustrating a first VCO included in the multi-phase mode VCO circuit shown in FIG. 1, and FIG. 3 is a circuit diagram illustrating a first VCO and a second VCO included in the multi- FIG. 4 is a circuit diagram for explaining the operation of the in-phase and anti-phase structures shown in FIG. 3. FIG.

Referring to FIG. 2, although the first VCO 100 is used as a reference, the second VCO 200 to the fourth VCO 400 may all be formed of the same circuit, and the second VCO 200, The description of the fourth VCO 400 is redundant and will not be described here.

The first VCO 100 includes a transformer 110, a first varactor 120 whose first end is connected to the first end of the transformer 110, a first varactor 120 connected to the first end of the transformer 110, And a second terminal connected to the second terminal of the inductor, and a second terminal connected to the second terminal of the inductor. Here, the first baractor 120 is the same as the first baractor 120, but the first baractor 120 is defined as the first baractor 120 located at the left node with respect to the variable power source 130, And a bartack located at the node is defined as a second bartacker 120.

The first VCO 100 includes a variable power source 130 for applying power between the first and second varactors 120 and 120, a first power source 130 for applying power to at least one transistor, A first switch 151 or SW_VDD for controlling whether the first power source 141 is applied or not and a pair of first inputs 141 and 142 receiving the first power 141 by the first switch 151, And a first transistor 171 and a second transistor 172 connected to the pair of first input power supplies 160. The power source 160 may be a constant current source,

The first VCO 100 includes a second switch 152 for controlling whether or not the first VCO 100 is connected to the ground 142 and the ground 142 and a second switch 152 for controlling whether or not the second switch 152 is connected to the ground 142 A third transistor 173 and a fourth transistor 174 connected to a pair of second input power supplies 180 and a first transistor 173 and a second input power supply 180, VI + 2 and VI- And a pair of third input power supplies 190 connected between the third and fourth transistors 174 and 174 and connected between the second and third transistors 172 and 174.

The operation of the first VCO 100 having the above-described configuration will be described below. The operation of the first VCO 100 is the same as that of the second VCO 200 to the fourth VCO 400. The operation of the first VCO 100 is described below. 4 The description of the VCO 400 will be omitted.

First, the input terminal of the first VCO 100 is divided into three types and includes a first input power supply 160, a second input power supply 180, and a third input power supply 190. Here, the output stages are VO- and VO +, and the outputs of VO- and VO + are 180 degrees out of phase.

The inductance of the transformer 110 and the capacitance of the first and second varactors 120 and 120 determine the frequency of the first VCO 100. The inductance of the transformer 110 is determined by the inductance of the transformer 110, The frequency can be determined. Here, the frequency can be changed by the capacitance and the inductance as shown in the following Equation 1, and the frequency can be changed when the capacitance and the inductance are changed.

Figure pat00001

The multiphase mode VCO circuit 1 according to an embodiment of the present invention not only changes the value of the bactator 120 by adjusting the input signal of the variable power supply 130 from 0 V to VDD, May be implemented as an inductor to control the transformer 110 to change the mutual inductance value to change the frequency.

Referring to FIG. 3, an in-phase structure and an anti-phase structure are implemented using a first VCO 100 and a second VCO 200 to adjust a mutual inductance value of the transformer 110. Referring to FIG. 4, the first VCO 100 and the second VCO 200 are connected in an in-phase structure and an anti-phase structure. The first VCO 100 and the second VCO 200 are connected to each other. The inductor of the transformer 110 plays the role of the transformer 110 and affects each other. At this time, the third input power supply 190 of the first VCO 100 and the second VCO 200 is not used yet.

Hereinafter, since the two VCOs are used, the same reference numerals as in the above description are used without using the reference numerals.

Considering the operation in the in-phase structure, when the first switch SW_GND is turned off by the first VCO 100 and the second VCO 200 and the first switch SW_VDD is turned on, 2 input power sources VI + 2 and VI-2 are inactivated and only the input terminals of the first input power sources VI + and VI- can receive signals.

Accordingly, the anti-phase mode indicated by the solid line in FIG. 2 is inactivated and only the in-phase mode indicated by the dotted line is activated.

Phase of the first VCO 100 and that of the second VCO 200 are the same. In this case, the inductors of the transformers of the first VCO 100 and the second VCO 200 are arranged in the same direction The current flows and the value of the inductance is increased to L0 = L + M due to the mutual inductance of the two inductors, so that the frequency value is the same as in Equation (1) described above. Where L is the inductance of the inductor itself and M is the mutual inductance.

In the anti-phase structure, when the first switch SW_VDD is turned off and the second switch SW_GND is turned on, the input first input power supply VI +, VI- is inactivated and the second input power supply VI + 2, and VI-2). Therefore, only the anti-phase mode indicated by the solid line is activated, and the in-phase mode indicated by the dotted line is inactivated.

In the anti-phase mode, the phases of the outputs VCO + of the first VCO 100 and the output VCO + of the second VCO 200 are opposite to each other, and thus the inductors of the transformers of the first VCO 100 and the second VCO 200 The current flows in the other direction, and the inductance value becomes L0 = LM due to the mutual inductance of the two inductors, so that the frequency value increases. At this time, LO is defined as the current inductance of the transformer.

FIG. 1 shows a quadrature structure of the in-phase structure and the anti-phase structure of FIG. 3 and FIG. 1, a total of four VCOs, i.e., a first VCO 100 to a fourth VCO 400, are used. The first VCO 100 and the second VCO 200, the third VCO 300, VCO 400 are connected in a form capable of selectively operating in anti-phase and in-phase as shown in FIGS. 3 and 4, respectively.

1, the first VCO 100 and the third VCO 300 are connected in a quadrature structure. The quadrature structure can produce a total of four phases. That is, in the quadrature structure, four different phases can be obtained from VO + and VO- of the first VCO 100 and VO + and VO- of the third VCO 300, respectively. For example, assuming that the phase of VO + of the first VCO 100 is 0 degree, the phase of VO- of the first VCO 100 is 180 degrees, the phase of VO + of the third VCO 300 is 90 degrees, And the VO-phase of the third VCO 300 is 270 degrees. Therefore, four phases of 0 degrees, 90 degrees, 180 degrees, and 270 degrees can be obtained.

The input power sources of the first VCO 100 and the second VCO 200 are VDD1 and the input power sources of the third VCO 300 and the fourth VCO 400 are separated by VDD2, The first VCO 100 to the fourth VCO 400 are all operated so that a total of four desired voltages VO + and VO- of the first VCO 100 and the third VCO 300 Phase can be obtained. That is, when power is applied only to VDD1 and power is not applied to VDD2, the third VCO 300 and the fourth VCO 400 do not operate. The first VCO 100 and the second VCO 200 ) To obtain two phases (0 degrees and 180 degrees).

In this case, all four VCOs 100, 200, 300, and 400 need to be operated. Therefore, in the four-phase mode in which all of the first to fourth VCOs 100 to 400 are operated, Consumption is great. Therefore, when only two phases are required, it is possible to separate VDD1 and VDD2 by applying power only to VDD1, thereby reducing power dissipation.

The multi-phase mode VCO circuit 1 according to an embodiment of the present invention is a dual ring structure in which an in-phase structure and an anti-phase structure and a quadrature structure are combined. Accordingly, in addition to varying the capacitance of the bactor through the in-phase structure and the anti-phase structure, the inductance of the inductor constituting the transformer is also changed to widen the frequency range, and the quadrature ring structure can be used to change various phases It is implemented to be obtained selectively. In this case, the mode of the multi-phase mode VCO circuit 1 according to an embodiment of the present invention can be operated in a total of four modes as shown in Table 1 below.

SW_VDD SW_GND VDD1 VDD2 Mode ON OFF ON ON 4Phase High (Low) frequency ON OFF ON OFF 2Phase High (Low) frequency OFF ON ON ON 4phase Low (High) frequency OFF ON ON OFF 2Phase Low (High) frequency

Therefore, the multiphase mode VCO circuit 1 according to the embodiment of the present invention can increase the frequency range by using the inductor of the transformer by using the dual ring structure, and by using the quadrature structure, Can be implemented at the same time.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (7)

A first VCO for varying an oscillation frequency with an input voltage;
A second VCO connected to the first VCO to have an in-phase or an anti-phase structure;
A third VCO connected to the first VCO in a quadrature structure;
A fourth VCO connected to the third VCO so as to have an in-phase or anti-phase structure;
Phase mode VCO (Voltage Controlled Oscillator) circuit.
The method according to claim 1,
The first VCO to the fourth VCO may include:
Phase VCO circuit is formed by a VCO circuit using a dual ring structure.
The method of claim 1, wherein
The first VCO to the fourth VCO may include:
Transformer;
A first varactor having a first end connected to a first end of the transformer;
A second baractor having an alley connected to a second end of the first baractor and a second end connected to a second end of the inductor;
A variable power source for applying power between the first and second barriers;
A first power supply for applying power to at least one transistor;
A first switch for controlling whether or not the first power source is applied;
A pair of first input power sources receiving the first power by the first switch;
A first transistor and a second transistor coupled to the pair of first input power supplies;
grounding;
A second switch for controlling connection to the ground;
A pair of second input power sources connected to the ground by the second switch;
A third transistor and a fourth transistor coupled to the pair of second input power supplies;
A pair of third input power sources connected between the first and third transistors and connected between the second and fourth transistors,
Respectively. ≪ / RTI >
The method according to claim 1,
Each of the first to fourth VCOs includes a transformer,
Wherein the transformer adjusts the mutual inductance and changes the frequency using an inductor.
The method according to claim 1,
And the outputs of the first to fourth VCOs each have a phase difference of 180 degrees.
The method according to claim 1,
Wherein the output frequencies of the first to fourth VCOs are based on the inductance of the inductors forming the transistors included in the first to fourth VCOs and the capacitances of the varactors.
The method according to claim 1,
Wherein the multi-phase mode VCO circuit comprises:
Wherein the in-phase or anti-phase structure and the quadrature structure are used to increase the usable frequency bandwidth.
KR1020150038114A 2015-03-19 2015-03-19 Muti phase mode vco circuit using transformer and configurable multi phase mode based on ultra wide band ring vco using dual ring structure KR20160112413A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112003569A (en) * 2020-09-07 2020-11-27 华南理工大学 High-stability ultra-wideband tuning voltage-controlled oscillator based on three-inductance coupling

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110055093A (en) 2009-11-19 2011-05-25 주식회사 파이칩스 Oscillator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110055093A (en) 2009-11-19 2011-05-25 주식회사 파이칩스 Oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112003569A (en) * 2020-09-07 2020-11-27 华南理工大学 High-stability ultra-wideband tuning voltage-controlled oscillator based on three-inductance coupling

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