A broadband polyphase coupled traveling wave oscillator

Abstract

The application discloses a wideband multi-phase coupled traveling wave oscillator, which realizes the switching of the coupling modes of two traveling wave oscillator units through a first switch unit and a second switch unit, so that two different oscillation frequencies are realized, and the output frequency range of the traditional multi-phase oscillator is greatly improved; in addition, the layout of the two traveling wave oscillator units when coupled has a large overlapping part, and the overall area almost does not increase; and the switch used for mode switching is not located on the transmission path in the design, and the parasitic effect of the switch has little influence on the overall performance of the oscillator, and the switch can be applied to high-frequency design.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oscillator, more particularly to a wideband multi-phase coupled traveling wave oscillator. BACKGROUND

[0002] Oscillator is a device that converts DC into AC signal without external signal excitation. It has positive feedback and certain gain to overcome the loss on the feedback path of the circuit, so it can generate a self-sustaining stable output oscillation signal. Voltage-controlled oscillator, as one of the main categories of oscillators, is used in phase-locked loop, clock recovery circuit and other modules, and is one of the core modules of wireless communication system. Figure 1 As shown in (a), the oscillator can be divided into active circuit and LCR resonant circuit. The upper resonant circuit relies on the resonance of capacitor C and inductor L, and R is the equivalent resistance for representing the energy loss during resonance. The negative resistance-R generated by the lower active circuit offsets the resistance generated by the resonant circuit and supplements the energy loss in the resonant circuit. Therefore, the oscillator realizes the stable output of the f0 resonance point as shown in (b) when it is in stable oscillation. The oscillation frequency can be calculated as Figure 1

[0003] The output phase of the oscillator is one of its important indicators. Multi-phase output oscillators are widely used in subharmonic mixers, analog-to-digital converters (ADCs), clock data recovery (CDR) and many other key radio frequency modules. Coupled LC oscillators or traveling wave oscillators are commonly used to generate multi-phase output.

[0004] The existing multi-phase oscillator occupies a large area and has a narrow tuning range.

[0005] Therefore, there is an urgent need for a wideband multi-phase coupled traveling wave oscillator that can solve the above problems. SUMMARY

[0006] To solve the existing problems, the present application provides a wideband multi-phase coupled traveling wave oscillator, which realizes the switching of the coupling mode of two traveling wave oscillator units through a switch, thereby realizing two different oscillation frequencies and greatly improving the output frequency range of the traditional multi-phase oscillator.

[0007] In the first aspect, the present application provides a wideband multi-phase coupled traveling wave oscillator, comprising

[0008] The first traveling wave oscillator unit is arranged in a ring structure with the first and second sub-circles being connected head to tail and left to right staggered and stacked, and the first active circuit is coupled between the first and second sub-circles.

[0009] ​​A second traveling wave oscillator unit, which has the same structure as the first traveling wave oscillator unit, and which comprises at least a third sub-circle and a fourth sub-circle, and a second active circuit is coupled between the third sub-circle and the fourth sub-circle; at least part of the first sub-circle and / or the second sub-circle is nested between the third sub-circle and the fourth sub-circle; and at least part of the third sub-circle and / or the fourth sub-circle is nested between the first sub-circle and the second sub-circle.

[0010] The first traveling wave oscillator unit and the second traveling wave oscillator unit are configured to adjust the on-off of the first switch unit and the second switch unit to control the first traveling wave oscillator unit and the second traveling wave oscillator unit to switch between the first coupling state and the second coupling state.

[0011] In some embodiments of the present application, the number of turns of the first traveling wave oscillator unit and the second traveling wave oscillator unit is N, where N is 2 or a multiple of 2.

[0012] In some embodiments of the present application, the number of the first active circuits is multiple, and they are uniformly distributed between the first sub-circle and the second sub-circle.

[0013] In some embodiments of the present application, the number of the second active circuits is the same as that of the first active circuits, and the second active circuits are uniformly distributed between the third sub-circle and the fourth sub-circle.

[0014] In some embodiments of the present application, the first switch unit comprises at least a first sub-switch and a second sub-switch, the first sub-switch is coupled between the second sub-circle and the third sub-circle, and the second sub-switch is coupled between the first sub-circle and the third sub-circle.

[0015] In some embodiments of the present application, the second switch unit comprises at least a third sub-switch and a fourth sub-switch, the third sub-switch is coupled between the first sub-circle and the second sub-circle, and the fourth sub-switch is coupled between the third sub-circle and the fourth sub-circle.

[0016] In some embodiments of the present application, when the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the first coupling state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is a; when the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the second coupling state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is b, where the difference between a and b is 180°.

[0017] In some embodiments of the present application, the first active circuit and / or the second active circuit comprises at least two cross-coupled MOS transistors or triodes.

[0018] In a second aspect, the present application also provides a wideband multi-phase coupled traveling wave oscillator, comprising

[0019] A first traveling wave oscillator unit is arranged in a wrap-around structure with the first and second ends connected and the first and second sub-circles staggered and overlapped, the first traveling wave oscillator unit comprising at least partially staggered and overlapped first and second sub-circles, and a first capacitor coupled between the first and second sub-circles.

[0020] A second traveling wave oscillator unit has the same structure as the first traveling wave oscillator unit, and comprises at least third and fourth sub-circles, and a second capacitor coupled between the third and fourth sub-circles; at least part of the first and / or second sub-circles is nested between the third and fourth sub-circles; and at least part of the third and / or fourth sub-circles is nested between the first and second sub-circles.

[0021] The first and second traveling wave oscillator units are configured to adjust the first and second capacitors to change the oscillation frequencies of the first and second traveling wave oscillator units.

[0022] In some embodiments of the present application, the first capacitor has a plurality of capacitors uniformly arranged between the first and second sub-circles; and the second capacitor has a plurality of capacitors uniformly arranged between the third and fourth sub-circles.

[0023] The present application provides a wideband multi-phase coupled traveling wave oscillator, which switches the coupling mode of the two traveling wave oscillator units through the first and second switch units, thereby achieving two different oscillation frequencies, greatly improving the output frequency range of the conventional multi-phase oscillator. In addition, the layout of the two traveling wave oscillator units when coupled has a large overlap, and the overall area is almost not increased. Moreover, the switches used for mode switching are not located on the transmission path in the design, and their parasitic effects have little effect on the overall performance of the oscillator, which can be applied to high-frequency design. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The present application provides a wideband multi-phase coupled traveling wave oscillator, which switches the coupling mode of the two traveling wave oscillator units through the first and second switch units, thereby achieving two different oscillation frequencies, greatly improving the output frequency range of the conventional multi-phase oscillator. In addition, the layout of the two traveling wave oscillator units when coupled has a large overlap, and the overall area is almost not increased. Moreover, the switches used for mode switching are not located on the transmission path in the design, and their parasitic effects have little effect on the overall performance of the oscillator, which can be applied to high-frequency design.

[0025] Figure 2 The present application provides a wideband multi-phase coupled traveling wave oscillator, which switches the coupling mode of the two traveling wave oscillator units through the first and second switch units, thereby achieving two different oscillation frequencies, greatly improving the output frequency range of the conventional multi-phase oscillator. In addition, the layout of the two traveling wave oscillator units when coupled has a large overlap, and the overall area is almost not increased. Moreover, the switches used for mode switching are not located on the transmission path in the design, and their parasitic effects have little effect on the overall performance of the oscillator, which can be applied to high-frequency design.

[0026] Figure 3 The present application provides a wideband multi-phase coupled traveling wave oscillator, which switches the coupling mode of the two traveling wave oscillator units through the first and second switch units, thereby achieving two different oscillation frequencies, greatly improving the output frequency range of the conventional multi-phase oscillator. In addition, the layout of the two traveling wave oscillator units when coupled has a large overlap, and the overall area is almost not increased. Moreover, the switches used for mode switching are not located on the transmission path in the design, and their parasitic effects have little effect on the overall performance of the oscillator, which can be applied to high-frequency design.

[0027] Figure 4 Structure diagram of the traveling wave oscillator of the present application;

[0028] Figure 5 Structure diagram of the traveling wave oscillator of the present application;

[0029] Figure 6 Structure diagram of the traveling wave oscillator of the present application;

[0030] Figure 7 Structure diagram of the traveling wave oscillator of the present application;

[0031] Figure 8 Structure diagram of the traveling wave oscillator of the present application; DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, any other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0034] In the application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as exemplary in this application is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. Details are set forth in the following description for purpose of explanation. It should be appreciated that one of ordinary skill in the art will readily recognize that the application can be practiced without the use of these specific details. In other instances, well-known structures and processes have not been described in detail in order to avoid obscuring the description of the application. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded with the widest scope consistent with the principles and features disclosed herein.

[0035] It is to be understood that Figure 2 , a conventional coupled LC oscillator, a schematic diagram of which is shown in Figure 2 . N LC oscillators are coupled into a loop, and each oscillator has a different phase at its output. This method produces a multi-phase output with the following advantages: (1) the number of output phases can be extended by increasing the number of coupled cores; (2) the phase noise can be optimized by the number of coupled cores, and in an ideal case, N-core coupling can achieve a phase noise suppression of 10logN dB. However, additional coupling circuits and on-chip interconnections are required, and the oscillator occupies a large chip area. In addition, the chip layout is limited, and when the number of required phases increases, the number of integrated cores is limited.

[0036] More specifically, refer to Figure 3 , a conventional traveling wave oscillator, a schematic diagram of which is shown in Figure 3 . Four pairs of active circuits provide negative resistance for oscillation and are evenly distributed on a loop formed by a differential transmission line. The four pairs of active circuits generate standing waves with different phases, and superimpose to form a traveling wave on the entire loop, so that there are phases with equal amplitude and phase from 0-360° on the entire oscillation loop. This method produces an unlimited number of phases, and the overall area is smaller than that of the coupled LC oscillator. The tuning range of the oscillator is limited. The tuning range refers to the frequency range of the signal supported by the oscillator. In the prior art, the equivalent capacitance of the oscillator is usually changed to adjust the frequency, for example, adding adjustable and switched capacitors on the loop. The range of the capacitance value of such variable capacitors is limited, and at the same time, considering that there are many fixed parasitic capacitances in the oscillator loop, the above variable capacitors only exist as a component of the total capacitance of the loop, and have limited contribution to the change of the oscillation frequency of the oscillator. Therefore, the tuning range of the existing traveling wave oscillator is narrow.

[0037] Therefore, the conventional traveling wave oscillator has a narrow tuning range, and the coupled traveling wave oscillator in the application can generate high and low working frequencies by introducing mode switching, thereby expanding the tuning range of the traveling wave oscillator. Moreover, the mode switch for mode switching does not cause deterioration of the phase noise of the oscillator. Therefore, the oscillator can simultaneously realize multi-phase, low phase noise and wide tuning range output. The detailed scheme is explained as follows.

[0038] In the embodiments of the application, please refer to Figure 4 to Figure 8 A wideband multi-phase coupled traveling wave oscillator includes a first traveling wave oscillator unit arranged in a ring structure with head-to-tail and left-to-right staggered arrangement, the first traveling wave oscillator unit includes at least a first sub-circle and a second sub-circle arranged in a staggered arrangement, and a first active circuit is coupled between the first sub-circle and the second sub-circle; a second traveling wave oscillator unit has the same structure as the first traveling wave oscillator unit, and the second traveling wave oscillator unit includes at least a third sub-circle and a fourth sub-circle, and a second active circuit is coupled between the third sub-circle and the fourth sub-circle; at least part of the first sub-circle and / or the second sub-circle is arranged in a nested manner between the third sub-circle and the fourth sub-circle; and at least part of the third sub-circle and / or the fourth sub-circle is arranged in a nested manner between the first sub-circle and the second sub-circle; wherein at least a first switch unit and a second switch unit are arranged between the first traveling wave oscillator unit and the second traveling wave oscillator unit, and the first traveling wave oscillator unit and the second traveling wave oscillator unit are configured to adjust the on-off of the first switch unit and the second switch unit to control the switching of the first traveling wave oscillator unit and the second traveling wave oscillator unit between a first coupled state and a second coupled state.

[0039] The switching of the coupling mode of the two traveling wave oscillator units is realized by the first switch unit and the second switch unit, thereby realizing two different oscillation frequencies, which greatly improves the output frequency range of the conventional multi-phase oscillator; in addition, the layout of the two traveling wave oscillator units when coupled has a large overlapping part, and the overall area almost does not increase; and the switch for mode switching is not located on the transmission path in the design, and the parasitic effect has little effect on the overall performance of the oscillator, which can be applied to high frequency design.

[0040] In some embodiments of the application, the number of the first traveling wave oscillator unit and the second traveling wave oscillator unit is N, wherein N is 2 or a multiple of 2.

[0041] In some embodiments of the application, the number of the first active circuit is multiple, and is uniformly distributed between the first sub-circle and the second sub-circle.

[0042] In some embodiments of this application, the number of the second active circuit and the first active circuit are the same, and the second active circuit is evenly distributed between the third sub-circle and the fourth sub-circle.

[0043] In some embodiments of this application, the first switching unit includes at least a first sub-switch and a second sub-switch, the first sub-switch being coupled between the second sub-circle and the third sub-circle, and the second sub-switch being coupled between the first sub-circle and the third sub-circle.

[0044] In some embodiments of this application, the second switching unit includes at least a third sub-switch and a fourth sub-switch, wherein the third sub-switch is coupled between the first sub-loop and the second sub-loop, and the fourth sub-switch is coupled between the third sub-loop and the fourth sub-loop.

[0045] In some embodiments of this application, when the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the first coupled state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is a; when the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the second coupled state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is b, wherein the difference between a and b is 180°.

[0046] When the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the first coupled state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is π; when the first traveling wave oscillator unit and the second traveling wave oscillator unit are in the second coupled state, the phase difference between the first traveling wave oscillator unit and the second traveling wave oscillator unit is 0.

[0047] The coupled traveling wave oscillator proposed in this invention is composed of two traveling wave oscillator units coupled together, such as... Figure 4 As shown, the two colors represent two traveling-wave oscillator units. Each traveling-wave oscillator unit is wound twice to support the output of a differential signal. Eight active circuits are evenly placed at these differential positions throughout the loop to provide negative resistance for oscillation. Two such traveling-wave oscillator units are nested together to create coupling, and two mode switches, S1 and S2, are placed between them for mode switching.

[0048] To further demonstrate the principle of mode switching in a coupled traveling wave oscillator, Figure 5The two above-mentioned traveling wave oscillator units are unfolded into a single ring and the active circuit parts are ignored. The dashed lines represent the closed mode switches in each mode, and the gray arrows represent the direction of the traveling wave signal, which indicates the positive direction of the phase change; the arrows on the transmission lines represent the current direction, and the numbers represent the phase. When the mode switch S1 is closed, the coupled traveling wave oscillator works in coupled mode one, and the phases of the corresponding connection points of the two units are synchronized, as shown in Figure 5 (a). When the mode switch S2 is closed, the coupled traveling wave oscillator works in coupled mode two, and the phases of the corresponding connection points of the two units are synchronized in another state, as shown in Figure 5 (b).

[0049] Figure 6 It is shown that in the structure of the proposed coupled traveling wave oscillator, the current directions on the adjacent coupled transmission lines when working in different modes. The currents on the transmission lines respectively show reverse and same directions, corresponding to the reverse and same directions of the magnetic induction lines and the magnetic coupling. If only the magnetic coupling which mainly affects the frequency is considered, the oscillation frequencies in the above-mentioned two working modes can be calculated as:

[0050]

[0051]

[0052] Therefore, mode one and mode two correspond to a higher and a lower oscillation frequency, respectively.

[0053] In some embodiments of the present application, the first active circuit and / or the second active circuit include at least two cross-coupled MOS transistors or triodes. Each active circuit part for providing negative resistance can be implemented by cross-coupled NMOS, PMOS, CMOS or triodes, as shown in Figure 7 Different active circuits have different performances such as phase noise and power consumption, and can be selected according to the performance requirements for implementation.

[0054] In some embodiments of the present application, a first traveling wave oscillator unit is arranged in a ring structure with head-to-tail and left-to-right staggered arrangement, the first traveling wave oscillator unit comprising at least a first sub-circle and a second sub-circle staggered and arranged in part, and a first capacitor coupled between the first sub-circle and the second sub-circle; a second traveling wave oscillator unit has the same structure as the first traveling wave oscillator unit, and the second traveling wave oscillator unit comprises at least a third sub-circle and a fourth sub-circle, and a second capacitor coupled between the third sub-circle and the fourth sub-circle; at least part of the first sub-circle and / or the second sub-circle is arranged in a nested manner between the third sub-circle and the fourth sub-circle; and at least part of the third sub-circle and / or the fourth sub-circle is arranged in a nested manner between the first sub-circle and the second sub-circle; wherein the first traveling wave oscillator unit and the second traveling wave oscillator unit are configured to adjust the first capacitor and the second capacitor to change the oscillation frequency of the first traveling wave oscillator unit and the second traveling wave oscillator unit.

[0055] The capacitors are connected to both sides of the differential transmission line, as shown in Figure 8 The local oscillator can adjust the output frequency by controlling the change of the capacitors, and the capacitors can be implemented in the form of fixed capacitors, varactor diodes, and switched capacitors. By adjusting the number and size of the capacitors, different frequency tuning ranges can be achieved, thereby achieving continuous coverage of the oscillator output frequency.

[0056] In some embodiments of the present application, the number of the first capacitors is multiple, and the first capacitors are uniformly arranged between the first sub-circle and the second sub-circle; the number of the second capacitors is multiple, and the second capacitors are uniformly arranged between the third sub-circle and the fourth sub-circle.

[0057] The coupled traveling wave oscillator proposed in the present application realizes the miniaturization design of wide frequency multi-phase oscillator. The switching of the coupling mode of the two traveling wave oscillator units is realized by a switch, thereby realizing two different oscillation frequencies, which greatly improves the output frequency range of the traditional multi-phase oscillator. In addition, the layout of the two traveling wave oscillator units when coupled has a large overlapping part, and the overall area almost does not increase. Moreover, the switch used for mode switching is not located on the transmission path in the design, and the parasitic effect has little effect on the overall performance of the oscillator, which can be applied to high frequency design.

[0058] Therefore, compared with the performance of the traditional oscillator, as shown in Table 1 below. The present application still has excellent phase noise and area performance while improving the output frequency range and supporting output of multiple phases. The present application has advantages in comprehensive performance and manufacturing cost.

[0059] Table 1. Performance comparison of the present application and the traditional oscillator

[0060]

[0061]

[0062] In the above-described embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be repeated here.

[0063] The foregoing merely illustrates the principles of the application. It will thus be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown herein, embody the principles of the application and are thus within its spirit and scope. It will be understood that the application is not limited to the embodiments described above, but includes all embodiments which would normally occur to persons of ordinary skill in the art upon reading the above description and appended claims.

[0064] Also, the use of "a" or "an" to describe elements of the application is merely for convenience and is not intended in a limiting sense unless otherwise indicated. Similarly, the use of "one embodiment" or "an embodiment" to describe one implementation of the application, unless otherwise indicated, does not mean that same embodiment is necessarily being repeatedly referenced, only that same embodiment is suitable for those circumstances. Unless otherwise expressly defined herein, all terms are to be given their broadest possible interpretation including modifiably and non-modifiably used terms. Furthermore, unless otherwise expressed, structures lossened terms shall not be construed as limiting of any certain embodiments.

[0065] Similarly, it is to be noticed that the term "comprising", used in the description, is not to be interpreted as limiting, but as meaning "comprising" also. It is to be understood that the features mentioned above and those yet to be mentioned below can be applied not only to the respective mentioned embodiments, but also to combinations of the embodiments and to embodiments in general.

[0066] Some embodiments use numerical ranges to describe quantities of components, attributes, etc. It should be understood that such numerical ranges described in the embodiments are, in some examples, modified by the word "about". Unless otherwise indicated, the word "about" means ±20% of the value of the range cited. Numerical parameters are only approximations, as it is expected that the embodiments will vary some amount from the numerical parameters. In some embodiments, numerical parameters are approximations and are intended to be construed broadly and flexibly. Unless otherwise indicated, numerical parameters are to be considered approximations. Where necessary, numerical parameters are to be rounded to the nearest integer. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, can contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0067] Each and every patent, patent application, publication, document, article, book, instruction manual, and / or other material cited herein is hereby incorporated by reference in its entirety for all purposes to the same extent as if each individual publication, document, article, book, instruction manual, and / or other material were specifically and individually indicated to be incorporated by reference for all purposes. In the event of inconsistencies between the disclosure of the present application and the disclosure of the materials incorporated by reference, the disclosure of the present application shall prevail for purposes of the present application.

[0068] The above describes in detail the target detection method, system and device provided by the embodiment of the present application, which combines the feature fusion based on SSD with the depth separable convolution. The principle and implementation manner of the present application are described by using specific examples. The above embodiment is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In summary, the content of the present application should not be understood as a limitation.

Claims

1. A wideband polyphase coupled traveling wave oscillator, comprising: Comprising a first traveling wave oscillator unit arranged in a ring structure with first and second sub-circles being connected head to tail and left to right, and a first active circuit coupled between the first and second sub-circles; a second traveling wave oscillator unit arranged in a ring structure identical to the first traveling wave oscillator unit, and a second active circuit coupled between third and fourth sub-circles of the second traveling wave oscillator unit, at least part of the first and / or second sub-circles being nested between the third and fourth sub-circles, and at least part of the third and / or fourth sub-circles being nested between the first and second sub-circles; wherein at least a first switch unit and a second switch unit are arranged between the first and second traveling wave oscillator units, and the first and second traveling wave oscillator units are configured to adjust the first and second switch units to switch between a first coupled state and a second coupled state.

2. The wideband multiphase coupled traveling wave oscillator of claim 1, wherein, The number of sub-circles of the first and second traveling wave oscillator units is N, where N is 2 or a multiple of 2.

3. The wideband multiphase coupled traveling wave oscillator of claim 2, wherein, The number of first active circuits is multiple and uniformly distributed between the first and second sub-circles.

4. The wideband multiphase coupled traveling wave oscillator of claim 3, wherein, The number of second active circuits is the same as the number of first active circuits, and the second active circuits are uniformly distributed between the third and fourth sub-circles.

5. The wideband multiphase coupled traveling wave oscillator of claim 1, wherein, The first switch unit includes at least a first sub-switch and a second sub-switch, the first sub-switch being coupled between the second sub-circle and the third sub-circle, and the second sub-switch being coupled between the first sub-circle and the third sub-circle.

6. The wideband multiphase coupled traveling wave oscillator of claim 5, wherein, The second switch unit includes at least a third sub-switch and a fourth sub-switch, the third sub-switch being coupled between the first sub-circle and the second sub-circle, and the fourth sub-switch being coupled between the third sub-circle and the fourth sub-circle.

7. The wideband multiphase coupled traveling wave oscillator of claim 1, wherein, When the first and second traveling wave oscillator units are in the first coupled state, the phase difference between the first and second traveling wave oscillator units is a; when the first and second traveling wave oscillator units are in the second coupled state, the phase difference between the first and second traveling wave oscillator units is b, where the difference between a and b is 180°.

8. The wideband multiphase coupled traveling wave oscillator of claim 1, wherein, The first and / or second active circuit includes at least two cross-coupled MOS transistors or triodes.

9. The wideband multiphase coupled traveling wave oscillator of claim 1, wherein, Comprising a first traveling wave oscillator unit arranged in a ring structure with first and second sub-circles being connected head to tail and left to right, and a first capacitor coupled between the first and second sub-circles; A second traveling wave oscillator unit, which has the same structure as the first traveling wave oscillator unit, and the second traveling wave oscillator unit comprises at least a third sub-circle and a fourth sub-circle, and a second capacitor is coupled between the third sub-circle and the fourth sub-circle; at least part of the first sub-circle and / or the second sub-circle is nested between the third sub-circle and the fourth sub-circle; and at least part of the third sub-circle and / or the fourth sub-circle is nested between the first sub-circle and the second sub-circle; Wherein, the first traveling wave oscillator unit and the second traveling wave oscillator unit are configured to adjust the first capacitor and the second capacitor to change the oscillation frequency of the first traveling wave oscillator unit and the second traveling wave oscillator unit.

10. The wideband multiphase coupled traveling wave oscillator of claim 9, wherein, The number of the first capacitors is multiple, and they are uniformly arranged between the first sub-circle and the second sub-circle; the number of the second capacitors is multiple, and they are uniformly arranged between the third sub-circle and the fourth sub-circle.

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