An injection-locked oscillator circuit, a frequency adjustment method, and an injection-locked oscillator

Abstract

Embodiments of the present application belong to the field of radio frequency technology, and provide an injection-locked oscillation circuit, a frequency adjustment method for an oscillation circuit, and an injection-locked oscillator. A reference frequency signal is injected into the buffer module through a signal injection module, so that the buffer module outputs a corresponding oscillation feedback signal. This oscillation feedback signal is used to lock the frequency of the initial oscillation signal generated by the resonant circuit module to the frequency range set by the reference frequency signal source. Then, an output matching module receives the buffered isolation oscillation signal output by the buffer module and performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal to output a corresponding oscillation output signal, thereby solving the problem that the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitances of each node, the output frequency cannot be effectively changed, and the output frequency of the oscillator chip can only be adjusted by changing the power supply voltage of the oscillation circuit.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of radio frequency technology, and in particular, relate to an injection-locked oscillation circuit, a frequency adjustment method for an oscillation circuit, and an injection-locked oscillator. Background Art

[0002] Currently, with the development of millimeter-wave and terahertz technologies, millimeter-wave and terahertz have broad application prospects in fields such as communication, electronic countermeasure, radar, electromagnetic weapons, astronomy, medical imaging, non-destructive testing, environmental monitoring, and security inspection. As a key component of millimeter-wave and terahertz application technologies, oscillators have also received great attention from researchers.

[0003] However, the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitances of each node. Therefore, the output frequency cannot be effectively changed, and can only be adjusted by changing the power supply voltage of the oscillation circuit to adjust the magnitudes of the parasitic capacitances of each node, thereby adjusting the output frequency of the oscillator chip. Summary of the Invention

[0004] The embodiments of the present application provide an injection-locked oscillation circuit, a frequency adjustment method for an oscillation circuit, and an injection-locked oscillator, aiming to solve the problem that the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitances of each node, and the output frequency cannot be effectively changed, and can only be adjusted by changing the power supply voltage of the oscillation circuit to adjust the output frequency of the oscillator chip.

[0005] The embodiments of the present application propose an injection-locked oscillation circuit, which is connected to a working power supply and a reference frequency signal source. The injection-locked oscillation circuit includes:

[0006] A resonant circuit module for generating an initial oscillation signal;

[0007] A buffer module connected to the resonant circuit module, for receiving the initial oscillation signal and performing buffer isolation on the initial oscillation signal to output a buffer-isolated oscillation signal;

[0008] A signal injection module connected to the buffer module and the reference frequency signal source, for receiving the reference frequency signal output by the reference frequency signal source and injecting the reference frequency signal into the buffer module to enable the buffer module to output a corresponding oscillation feedback signal;

[0009] An output matching module connected to the buffer module, for receiving the buffer-isolated oscillation signal and performing energy enhancement processing on the second harmonic output of the buffer-isolated oscillation signal to output a corresponding oscillation output signal;

[0010] A bypass capacitor respectively connected to the working power supply and the output matching module;

[0011] Among them, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source.

[0012] The embodiment of the present application also provides a frequency adjustment method for an oscillation circuit, and the frequency adjustment method includes:

[0013] Generating an initial oscillation signal by using a resonant circuit module;

[0014] Receiving the initial oscillation signal by using a buffer module, and performing buffer isolation on the initial oscillation signal to output a buffer-isolated oscillation signal;

[0015] Injecting a reference frequency signal into the buffer module by using a signal injection module, so that the buffer module outputs a corresponding oscillation feedback signal; among them, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source;

[0016] Receiving the buffer-isolated oscillation signal by using an output matching module, and performing energy enhancement processing on the second harmonic output of the buffer-isolated oscillation signal to output a corresponding oscillation output signal.

[0017] The embodiment of the present application also provides an injection-locked oscillator, including:

[0018] A working power supply port;

[0019] A reference frequency signal source port; and

[0020] The injection-locked oscillation circuit as described in any one of the above, and the injection-locked oscillation circuit is respectively connected to the working power supply port and the reference frequency signal source port.

[0021] In an injection-locked oscillation circuit, a frequency adjustment method for an oscillation circuit, and an injection-locked oscillator proposed by the embodiment of the present application, a reference frequency signal is injected into the buffer module by using a signal injection module, so that the buffer module outputs a corresponding oscillation feedback signal, and the oscillation feedback signal is used to lock the frequency of the initial oscillation signal generated by the resonant circuit module to the frequency range set by the reference frequency signal source. Then, the output matching module receives the buffer-isolated oscillation signal output by the buffer module, and performs energy enhancement processing on the second harmonic output of the buffer-isolated oscillation signal to output a corresponding oscillation output signal, thereby solving the problem that the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitance of each node, the output frequency cannot be effectively changed, and the output frequency of the oscillator chip can only be adjusted by changing the power supply voltage of the oscillation circuit. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic structural diagram of an injection-locked oscillator circuit provided by an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of an injection-locked oscillator circuit provided by another embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the lower boundary of the spectrum of the oscillation output signal of an injection-locked oscillator circuit provided by an embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the upper boundary of the spectrum of the oscillation output signal of an injection-locked oscillator circuit provided by an embodiment of the present application;

[0027] Figure 5 is a schematic diagram of a frequency adjustment method for an oscillator circuit provided by an embodiment of the present application. Detailed implementation manners

[0028] To enable those skilled in the art to better understand the solutions of the present application, the following will clearly describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, rather than all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] The term "including" and any variations thereof in the specification and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices. In addition, the terms "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a specific order.

[0030] The discrete electronic components in the embodiments of the present application refer to electronic devices with independent circuit functions and basic units constituting a circuit. For example, resistors, capacitors, inductors, electromechanical components (connectors, switches, relays, etc.), electroacoustic devices, optoelectronic devices, sensitive components, display devices, piezoelectric devices, etc.

[0031] In a millimeter-wave fundamental frequency oscillation circuit, the output frequency and output power of the oscillator are improved through the coupling effect between the output buffer stage and the inductance of the resonant circuit. However, at this time, the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitances of each node. Therefore, usually, only by changing the power supply voltage of the oscillation circuit can the magnitudes of the parasitic capacitances of each node be affected, thereby affecting the output frequency of the oscillation circuit. In order to effectively change the output frequency of the oscillation circuit, in this application, an injection transistor is used to inject the reference frequency signal output by the reference frequency signal source 20 into the output buffer stage, thereby locking the frequency of the oscillation signal generated by the oscillation circuit within a preset frequency range, achieving the purpose of making the output frequency of the oscillation circuit adjustable.

[0032] Figure 1 An injection-locked oscillation circuit provided for an embodiment of this application, see Figure 1 As shown, the injection-locked oscillation circuit in this embodiment is connected to the working power supply 10 and the reference frequency signal source 20. Among them, the injection-locked oscillation circuit includes:

[0033] A resonant circuit module 30 for generating an initial oscillation signal;

[0034] A buffer module 40 connected to the resonant circuit module 30, for receiving the initial oscillation signal and performing buffer isolation on the initial oscillation signal to output a buffer-isolated oscillation signal;

[0035] A signal injection module 50 connected to the buffer module 40 and the reference frequency signal source 20, for receiving the reference frequency signal output by the reference frequency signal source 20 and injecting the reference frequency signal into the buffer module 40, so that the buffer module 40 outputs a corresponding oscillation feedback signal;

[0036] An output matching module 60 connected to the buffer module 40, for receiving the buffer-isolated oscillation signal and performing energy enhancement processing on the second harmonic output of the buffer-isolated oscillation signal to output a corresponding oscillation output signal; and

[0037] A bypass capacitor 70 respectively connected to the working power supply 10 and the output matching module 60;

[0038] Among them, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal within the frequency range set by the reference frequency signal source 20.

[0039] In this embodiment, the signal injection module 50 receives the reference frequency signal output by the reference frequency signal source 20, and injects the reference frequency signal into the buffer module 40, so that the buffer module 40 outputs a corresponding oscillation feedback signal. At this time, the resonant circuit module 30 receives the oscillation feedback signal, and locks the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source 20 according to the oscillation feedback signal, avoiding the parasitic capacitance generated when the reference frequency signal is directly injected into the resonant circuit module 30, thereby eliminating the influence of the parasitic capacitance on the operating frequency of the resonant circuit module 30, and achieving the purpose of high output frequency, adjustable output frequency and high output efficiency of the injection-locked oscillator circuit.

[0040] Further, when the resonant circuit module 30 locks the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source 20, the output matching module 60 performs energy enhancement processing on the second harmonic output of the buffer isolation oscillation signal to output a corresponding oscillation output signal. At this time, the frequency of the oscillation output signal is locked on the second harmonic of the initial oscillation signal, thereby achieving a higher output frequency.

[0041] In one embodiment, as shown in Figure 2 the resonant circuit module 30 includes:

[0042] a negative resistance effect generating unit 31 for generating a negative resistance effect by using a cross-coupled transistor pair to compensate for the energy loss of the resonant circuit module 30; and

[0043] a transformer structure unit 32 connected to the negative resistance effect generating unit 31 for increasing the operating frequency of the resonant circuit.

[0044] In this embodiment, the negative resistance effect generating unit 31 adopts a cross-coupled transistor pair structure, so as to generate a negative resistance effect when powered on through the cross-coupled transistor pair structure to compensate for the energy loss in the resonant circuit module 30. However, the parasitic capacitance in the cross-coupled transistor pair structure often greatly reduces the output frequency of the initial oscillation signal output by the resonant circuit module 30. Therefore, the transformer structure unit 32 can effectively reduce the influence of the parasitic capacitance at the gate terminal in the cross-coupled transistor pair structure, thereby avoiding the reduction of the operating frequency of the resonant circuit due to the parasitic capacitance introduced by the cross-coupled transistor pair structure.

[0045] In one embodiment, as shown in Figure 2 the negative resistance effect generating unit 31 includes: a first transistor M1 and a second transistor M2;

[0046] The control terminal of the first transistor M1 is connected to the first end of the transformer structure unit 32, the control terminal of the second transistor M2 is connected to the second end of the transformer structure unit 32, the current input terminal of the first transistor M1 is connected to the third end of the transformer structure unit 32, the current input terminal of the second transistor M2 is connected to the fourth end of the transformer structure unit 32, and the current output terminals of the first transistor M1 and the second transistor M2 are commonly connected to ground.

[0047] In one embodiment, referring to Figure 2 As shown, the transformer structure unit 32 includes: a first inductor L1, a second inductor L2, a third inductor L3, and a fourth inductor L4;

[0048] The first end of the first inductor L1 serves as the first end of the transformer structure unit 32, the first end of the second inductor L2 serves as the second end of the transformer structure unit 32, the first end of the third inductor L3 serves as the third end of the transformer structure unit 32, the first end of the fourth inductor L4 serves as the fourth end of the transformer structure unit 32, and the second ends of the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are commonly connected as the oscillation output signal output end of the transformer structure unit 32;

[0049] Wherein, the first inductor L1 and the third inductor L3 form a first coupled inductor, and the second inductor L2 and the fourth inductor L4 form a second coupled inductor.

[0050] In this embodiment, the first inductor L1, the second inductor L2, the third inductor L3, the fourth inductor L4, the current input terminal of the first transistor M1, the control terminal of the first transistor M1, the current input terminal of the second transistor M2, and the control terminal of the second transistor M2 can form a resonant circuit to output an initial oscillation signal. Specifically, the first transistor M1 and the second transistor M2 are formed into a cross-coupled transistor pair, which can generate a negative resistance effect to supplement the loss in the resonant circuit. The first inductor L1 and the third inductor L3 are mutually coupled to form a first coupled inductor, and the second inductor L2 and the fourth inductor L4 are mutually coupled to form a second coupled inductor. Among them, the coupling coefficient of the first coupled inductor and the coupling coefficient of the second coupled inductor can be the same.

[0051] In one embodiment, referring to Figure 2As shown, the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 can form an on-chip transformer structure, effectively reducing the influence of cross-coupling on the gate parasitic capacitance of the transistor and increasing the operating frequency of the resonant circuit. In this embodiment, the on-chip transformer can also improve the compactness of the oscillation circuit and enhance the performance of the oscillation circuit. Further, the oscillation circuit adopting a differential structure can also utilize the advantages of on-chip transformer coupling to have a higher output power than the single-ended structure oscillation circuit under the same area.

[0052] In one embodiment, the first transistor M1 and the second transistor M2 are both active devices. For example, the first transistor M1 and the second transistor M2 can both be N-type MOS transistors. Among them, the drain of the N-type MOS transistor can be the current input end of the first transistor M1 and the second transistor M2, the source of the N-type MOS transistor can be the current output end of the first transistor M1 and the second transistor M2, and the gate of the N-type MOS transistor can be the control end of the first transistor M1 and the second transistor M2.

[0053] In one embodiment, referring to Figure 2 As shown, the buffer module 40 includes: a third transistor M3, a fourth transistor M4, a fifth inductor L5, and a sixth inductor L6;

[0054] The control end of the third transistor M3 is connected to the first end of the transformer structure unit 32, the control end of the fourth transistor M4 is connected to the second end of the transformer structure unit 32, the current input end of the third transistor M3 is connected to the first end of the sixth inductor L6, the current input end of the fourth transistor M4 is connected to the first end of the fifth inductor L5, the second end of the fifth inductor L5 and the second end of the sixth inductor L6 are commonly connected to the oscillation output signal output end of the transformer structure unit 32, and the current output end of the third transistor M3 and the current output end of the fourth transistor M4 are commonly connected to ground;

[0055] Among them, the third inductor L3 and the fifth inductor L5 form a third coupled inductor, and the fourth inductor L4 and the sixth inductor L6 form a fourth coupled inductor.

[0056] In this embodiment, the third transistor M3, the fourth transistor M4, the fifth inductor L5, and the sixth inductor L6 constitute the output buffer stage of the injection-locked oscillation circuit, which is used to buffer and isolate the initial oscillation signal generated by the resonant circuit. Among them, the fifth inductor L5 and the sixth inductor L6 can serve as the loads of the output buffer stage and the signal injection module 50, and output the buffered and isolated oscillation signal from the common-mode node of the fifth inductor L5 and the sixth inductor L6. Further, the fifth inductor L5 and the third inductor L3 are mutually coupled to form a third coupled inductor, and the sixth inductor L6 and the fourth inductor L4 are mutually coupled to form a fourth coupled inductor, which can not only enhance the energy of the initial oscillation signal, but also feedback the reference frequency signal injected by the signal injection module 50 and the oscillation feedback signal output by the buffer module 40 back to the resonant circuit module 30, so that the initial oscillation signal generated by the resonant circuit module 30 is pulled by the frequency of the reference frequency signal, and the frequency of the initial oscillation signal is locked to the frequency range set by the reference frequency signal source 20.

[0057] In one embodiment, the coupling coefficients of the third coupled inductor and the fourth coupled inductor are the same. The fifth inductor L5, the sixth inductor L6, the third inductor L3, and the fourth inductor L4 can form an on-chip transformer structure, effectively reducing the influence of the parasitic capacitance at the gate end of the transistor and increasing the operating frequency of the resonant circuit.

[0058] In one embodiment, both the third transistor M3 and the fourth transistor M4 are active devices. For example, both the third transistor M3 and the fourth transistor M4 can be N-type MOS transistors. Among them, the drain of the N-type MOS transistor can be the current input end of the third transistor M3 and the fourth transistor M4, the source of the N-type MOS transistor can be the current output end of the third transistor M3 and the fourth transistor M4, and the gate of the N-type MOS transistor can be the control end of the third transistor M3 and the fourth transistor M4.

[0059] In one embodiment, as shown in Figure 2 the signal injection module 50 includes: a fifth transistor M5 and a sixth transistor M6;

[0060] the reference frequency signal source 20 includes: a first reference frequency signal source 21 for outputting a first reference frequency signal and a second reference frequency signal source 22 for outputting a second reference frequency signal;

[0061] The control terminal of the fifth transistor M5 is connected to the first reference frequency signal source 21, the control terminal of the sixth transistor M6 is connected to the second reference frequency signal source 22, the current input terminal of the fifth transistor M5 is connected to the current input terminal of the third transistor M3, the current input terminal of the sixth transistor M6 is connected to the current input terminal of the fourth transistor M4, and the current output terminals of the fifth transistor M5 and the sixth transistor M6 are commonly connected to ground.

[0062] In this embodiment, both the fifth transistor M5 and the sixth transistor M6 can be injection transistors, and respectively inject the first reference frequency signal output by the first reference frequency signal source 21 and the second reference frequency signal output by the second reference frequency signal source 22 into the output buffer stage of the injection-locked oscillation circuit, so that the initial oscillation signal of the resonant circuit module 30 is frequency-pulled by the first reference frequency signal and the second reference frequency signal, and thus locked at the frequencies of the first reference frequency signal and the second reference frequency signal.

[0063] In one embodiment, both the fifth transistor M5 and the sixth transistor M6 are active devices. For example, both the fifth transistor M5 and the sixth transistor M6 can be N-type MOS transistors. Among them, the drain of the N-type MOS transistor can be the current input terminals of the fifth transistor M5 and the sixth transistor M6, the current output terminals of the fifth transistor M5 and the sixth transistor M6, and the gate of the N-type MOS transistor can be the control terminals of the fifth transistor M5 and the sixth transistor M6.

[0064] In one embodiment, the first reference frequency signal and the second reference frequency signal can be a set of differential signals. Among them, the frequency amplitudes of the first reference frequency signal and the second reference frequency signal are the same, and the phase difference is 180 degrees. For example, if the first reference frequency signal is f0, then the second reference frequency signal is -f0. At this time, the output matching module 60 performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal, and the oscillation output signal frequency of the injection-locked oscillation circuit is locked at 2f0, so that the output frequency of the injection-locked oscillation circuit is locked at the second harmonic of the injection signal, realizing a higher output frequency.

[0065] In one embodiment, referring to Figure 2 As shown, the output matching module 60 includes: a coplanar waveguide CPW and a waveguide series capacitor C2;

[0066] The first end of the coplanar waveguide CPW is commonly connected to the working power supply 10 with the first end of the bypass capacitor 70, the second end of the coplanar waveguide CPW is commonly connected to the buffer module 40 with the first end of the waveguide series capacitor C2, the second end of the waveguide series capacitor C2 is used to output the oscillation output signal, and the second end of the bypass capacitor 70 is grounded.

[0067] In one embodiment, the bypass capacitor 70 may include a first capacitor C1. Wherein, the first end of the first capacitor C1 serves as the first end of the bypass capacitor 70, and the second end of the first capacitor C1 serves as the second end of the bypass capacitor 70. Further, the bypass capacitor 70 may also be the parasitic capacitance of the active device.

[0068] In one embodiment, the voltage range of the operating power supply 10 may be 0.85V to 1.5V, the frequency locking range of the initial oscillation signal may be 173.14 to 181.41 GHz, and the current consumed by the resonant circuit is 5 mA.

[0069] Figure 3 Schematic diagram of the lower boundary of the spectrum of the oscillation output signal of the injection-locked oscillation circuit provided by an embodiment of the present application. Figure 4 Schematic diagram of the upper boundary of the spectrum of the oscillation output signal of the injection-locked oscillation circuit provided by an embodiment of the present application. Wherein, the abscissa is the frequency and the ordinate is the amplitude. Refer to Figure 3 and Figure 4 As shown, the frequency locking range of the initial oscillation signal is 173.14 to 181.41 GHz. At this time, the output matching module 60 performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal. The frequency locking range of the oscillation output signal of the injection-locked oscillation circuit is 346.28 to 362.82 GHz, so that the output frequency of the injection-locked oscillation circuit is locked on the second harmonic of the injection signal, realizing an output oscillation signal up to 360 GHz.

[0070] In one embodiment, Figure 5 Schematic diagram of the frequency adjustment method of the oscillation circuit provided by an embodiment of the present application. Refer to Figure 5 As shown, the frequency adjustment method of the oscillation circuit in this embodiment includes:

[0071] Step S101: Generate an initial oscillation signal by using the resonant circuit module 30;

[0072] Step S102: Receive the initial oscillation signal by using the buffer module 40, and buffer and isolate the initial oscillation signal to output a buffered isolation oscillation signal;

[0073] Step S103: Inject a reference frequency signal into the buffer module 40 by using the signal injection module 50, so that the buffer module 40 outputs a corresponding oscillation feedback signal; wherein, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source 20;

[0074] Step S104: The output matching module 60 receives the buffered isolation oscillation signal, and performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal to output a corresponding oscillation output signal.

[0075] In this embodiment, the signal injection module 50 receives the reference frequency signal output by the reference frequency signal source 20, and injects the reference frequency signal into the buffer module 40, so that the buffer module 40 outputs a corresponding oscillation feedback signal. At this time, the resonant circuit module 30 receives the oscillation feedback signal, and locks the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source 20 according to the oscillation feedback signal, avoiding the parasitic capacitance generated when the reference frequency signal is directly injected into the resonant circuit module 30, thereby eliminating the influence of the parasitic capacitance on the operating frequency of the resonant circuit module 30, and achieving the purpose of high output frequency, adjustable output frequency and high output efficiency of the injection-locked oscillator circuit.

[0076] Furthermore, the output matching module 60 receives the buffered isolation oscillation signal, and performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal to output a corresponding oscillation output signal, thereby locking the output frequency of the frequency source chip to the second harmonic of the injection signal, and achieving an output signal of up to 360 GHz.

[0077] In one embodiment, the working power supply 10 can be a working power supply port for receiving a working power supply signal, and the reference frequency signal source 20 can be a reference frequency signal source port for receiving a reference frequency signal. Furthermore, the reference frequency signal source 20 can also be two physical ports for receiving a pair of differential signals.

[0078] In one embodiment, the present application embodiment also provides an injection-locked oscillator, including:

[0079] A working power supply port for receiving a working power supply signal;

[0080] A reference frequency signal source port for receiving a reference frequency signal; and

[0081] The injection-locked oscillator circuit as described in any one of the above, the injection-locked oscillator circuit is respectively connected to the working power supply port and the reference frequency signal source port.

[0082] In this embodiment, the reference frequency signal source port includes a first reference frequency signal input terminal for receiving a first reference frequency signal and a second reference frequency signal input terminal for receiving a second reference frequency signal. Specifically, the control terminal of the fifth transistor M5 is connected to the first reference frequency signal input terminal for receiving the first reference frequency signal, and the control terminal of the sixth transistor M6 is connected to the second reference frequency signal input terminal for receiving the second reference frequency signal.

[0083] In an injection-locked oscillation circuit, a frequency adjustment method of an oscillation circuit, and an injection-locked oscillator proposed in an embodiment of the present application, a reference frequency signal is injected into the buffer module 40 through the signal injection module 50, so that the buffer module 40 outputs a corresponding oscillation feedback signal, and the oscillation feedback signal is used to lock the frequency of the initial oscillation signal generated by the resonant circuit module 30 to the frequency range set by the reference frequency signal source 20. Then, the output matching module 60 receives the buffered isolation oscillation signal output by the buffer module 40, and performs energy enhancement processing on the second harmonic output of the buffered isolation oscillation signal to output a corresponding oscillation output signal, thereby solving the problem that the output frequency of the oscillation circuit only depends on the resonant circuit and the parasitic capacitance of each node, the output frequency cannot be effectively changed, and the output frequency of the oscillator chip can only be adjusted by changing the power supply voltage of the oscillation circuit.

[0084] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An injection-locked oscillator circuit is connected to a working power supply and a reference frequency signal source, and is characterized in that, The injection-locked oscillation circuit includes: A resonant circuit module for generating an initial oscillation signal; A buffer module connected to the resonant circuit module, for receiving the initial oscillation signal and buffering and isolating the initial oscillation signal to output a buffered and isolated oscillation signal; A signal injection module connected to the buffer module and the reference frequency signal source, for receiving the reference frequency signal output by the reference frequency signal source and injecting the reference frequency signal into the buffer module to enable the buffer module to output a corresponding oscillation feedback signal, where the reference frequency signal source includes a first reference frequency signal source for outputting a first reference frequency signal and a second reference frequency signal source for outputting a second reference frequency signal; An output matching module connected to the buffer module, for receiving the buffered and isolated oscillation signal and performing energy enhancement processing on the second harmonic output of the buffered and isolated oscillation signal to output a corresponding oscillation output signal; and A bypass capacitor respectively connected to the operating power supply and the output matching module; the bypass capacitor is a parasitic capacitor of an active device; Wherein, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal to the frequency range set by the reference frequency signal source.

2. The injection-locked oscillator circuit according to claim 1, characterized in that, The resonant circuit module includes: A negative resistance effect generating unit for generating a negative resistance effect by using a cross-coupled transistor pair to compensate for the energy loss of the resonant circuit; and A transformer structure unit connected to the negative resistance effect generating unit for increasing the operating frequency of the resonant circuit module.

3. The injection-locked oscillator circuit according to claim 2, characterized in that, The negative resistance effect generating unit includes: a first transistor and a second transistor; The control end of the first transistor is connected to the first end of the transformer structure unit, the control end of the second transistor is connected to the second end of the transformer structure unit, the current input end of the first transistor is connected to the third end of the transformer structure unit, the current input end of the second transistor is connected to the fourth end of the transformer structure unit, and the current output ends of the first transistor and the second transistor are commonly connected to ground.

4. The injection-locked oscillator circuit according to claim 2, characterized in that, The transformer structure unit includes: a first inductor, a second inductor, a third inductor, and a fourth inductor; The first end of the first inductor serves as the first end of the transformer structure unit, the first end of the second inductor serves as the second end of the transformer structure unit, the first end of the third inductor serves as the third end of the transformer structure unit, the first end of the fourth inductor serves as the fourth end of the transformer structure unit, and the second ends of the first inductor, the second inductor, the third inductor, and the fourth inductor are commonly connected as the oscillation output signal output end of the transformer structure unit; Wherein, the first inductor and the third inductor form a first coupled inductor, and the second inductor and the fourth inductor form a second coupled inductor.

5. The injection-locked oscillator circuit according to claim 4, characterized in that, The buffer module includes: a third transistor, a fourth transistor, a fifth inductor, and a sixth inductor; The control terminal of the third transistor is connected to the first end of the transformer structure unit, the control terminal of the fourth transistor is connected to the second end of the transformer structure unit, the current input terminal of the third transistor is connected to the first end of the sixth inductor, the current input terminal of the fourth transistor is connected to the first end of the fifth inductor, the second end of the fifth inductor and the second end of the sixth inductor are commonly connected to the oscillation output signal output terminal of the transformer structure unit, and the current output terminal of the third transistor and the current output terminal of the fourth transistor are commonly connected to ground; Wherein, the third inductor and the fifth inductor form a third coupled inductor, and the fourth inductor and the sixth inductor form a fourth coupled inductor.

6. The injection-locked oscillator circuit according to claim 5, characterized in that, The signal injection module includes: a fifth transistor and a sixth transistor; The control terminal of the fifth transistor is connected to the first reference frequency signal source, the control terminal of the sixth transistor is connected to the second reference frequency signal source, the current input terminal of the fifth transistor is connected to the current input terminal of the third transistor, the current input terminal of the sixth transistor is connected to the current input terminal of the fourth transistor, and the current output terminal of the fifth transistor and the current output terminal of the sixth transistor are commonly connected to ground.

7. The injection-locked oscillator circuit according to claim 1, characterized in that, The output matching module includes: a coplanar waveguide and a waveguide series capacitor; The first end of the coplanar waveguide and the first end of the bypass capacitor are commonly connected to the working power supply, the second end of the coplanar waveguide and the first end of the waveguide series capacitor are commonly connected to the buffer module, and the second end of the waveguide series capacitor is used to output the oscillation output signal.

8. A method for adjusting the frequency of an oscillator circuit, characterized in that, Applied to the injection-locked oscillation circuit according to any one of claims 1-7, the frequency adjustment method includes: Generating an initial oscillation signal by using the resonant circuit module; Receiving the initial oscillation signal by using the buffer module and performing buffer isolation on the initial oscillation signal to output a buffer-isolated oscillation signal; Injecting a reference frequency signal into the buffer module by using the signal injection module so that the buffer module outputs a corresponding oscillation feedback signal; wherein, the oscillation feedback signal is used to lock the frequency of the initial oscillation signal within the frequency range set by the reference frequency signal source; Receiving the buffer-isolated oscillation signal by using the output matching module and performing energy enhancement processing on the second harmonic output of the buffer-isolated oscillation signal to output a corresponding oscillation output signal.

9. The frequency adjustment method according to claim 8, characterized in that, The frequency adjustment method further includes: Receiving the oscillation feedback signal by using the resonant circuit module and locking the frequency of the initial oscillation signal within the frequency range set by the reference frequency signal source.

10. An injection-locked oscillator, characterized in that, Including: A working power supply port; A reference frequency signal source port; And The injection-locked oscillation circuit according to any one of claims 1-7, wherein the injection-locked oscillation circuit is respectively connected to the working power supply port and the reference frequency signal source port.

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