Dual-mode W-band voltage-controlled oscillator based on transformer magnetic tuning

Abstract

The present invention discloses a dual-mode W-band voltage controlled oscillator based on transformer magnetic tuning. [Solution] A dual-mode W-band voltage-controlled oscillator based on magnetic tuning of a transformer includes two pairs of cross-coupled MOS transistors, a dual-mode six-coil transformer, a fine-tuning MOS transistor in the tuning switch, a coarse-tuning MOS transistor in the tuning switch, and two pairs of output buffer stage MOS transistors. The equivalent inductance of the resonant cavity is changed by controlling fine-tuning MOS transistors Msw1 and Msw2. Fine-tuning MOS transistor Msw1 is turned on in the high-frequency band where its inductance is small and turned off in the low-frequency band where its inductance is large. For fine frequency tuning without a variable capacitance diode, the gate voltage of fine-tuning MOS transistor Msw2 is changed to change its resistance to achieve fine tuning of the equivalent inductance. By using a dual-mode six-coil transformer instead of a single-mode three-coil transformer, a W-band voltage-controlled oscillator with four bands is realized. The present invention achieves better phase noise due to the larger Q value of the resonant cavity, providing a high-quality local oscillation signal source for the W-band signal transmission and reception front end.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuits, and specifically relates to a dual-mode W-band voltage-controlled oscillator based on magnetic synchronization of a transformer.

Background Art

[0002] The frequency band of the W-band from 75 GHz to 110 GHz is widely applied in fields such as communication, radar, radio astronomy, weather radar, medical imaging, and scientific research. With the continuous shrinking of the CMOS process node, currently, it is possible to realize a voltage-controlled oscillator based on the CMOS process in this frequency band. However, at such high frequencies, realizing a voltage-controlled oscillator with low phase noise, low power consumption, and a wide tuning range is still a challenge.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the conventional tuning method using a varactor diode, there is a problem that when the frequency increases, the quality factor (Q) value rapidly decreases, which reduces the equivalent quality factor (Q) value of the resonant cavity and ultimately impairs the phase noise performance of the entire voltage-controlled oscillator. Also, considering the parasitic effects within the frequency range of the W-band, the tuning range of the varactor diode is usually limited to 6% or less, which is not sufficient for many applications, especially when it is necessary to cope with their process and temperature changes. Therefore, in the design of a W-band voltage-controlled oscillator circuit, improving the quality factor (Q) value of the resonant cavity, reducing phase noise, and realizing a wider frequency tuning range are extremely important challenges.

Means for Solving the Problems

[0004] In view of the drawbacks existing in the prior art, the present invention provides a dual-mode W-band voltage-controlled oscillator based on magnetic synchronization of a transformer.

[0005] The present invention achieves the above technical objectives by the following technical means.

[0006] The dual-mode W-band voltage-controlled oscillator based on transformer magnetic tuning includes cross-coupled pair MOS transistors M1, M2, M3, and M4; dual-mode 6-coil transformer coupling resonant coils L1 and L2; dual-mode 6-coil transformer fine-tuning coils Lsw1 and Lsw2; dual-mode 6-coil transformer coarse-tuning coils Lsw3 and Lsw4; tuning switch fine-tuning MOS transistors Msw1, Msw2, Msw3, and Msw4; output buffer stage MOS transistors M5, M6, M7, and M8. The sources of the cross-coupled pair MOS transistors M1 and M2 are grounded, the drains of the cross-coupled pair MOS transistors M1 and M2 are connected to the ends of the coupling resonant coil L1 of the dual-mode 6-coil transformer, and the gate of the cross-coupled pair MOS transistors M1 is connected to the drain of the cross-coupled pair MOS transistors M2. The gate of the output buffer stage MOS transistor M5 is connected to the drain of the cross-coupled pair MOS transistor M1, the source of the output buffer stage MOS transistor M5 is grounded, the drain of the output buffer stage MOS transistor M5 is connected to output OUT1P, the gate of the output buffer stage MOS transistor M6 is connected to the drain of the cross-coupled pair MOS transistor M2, the source of the output buffer stage MOS transistor M6 is grounded, and the drain of the output buffer stage MOS transistor M6 is connected to output OUT1N. The aforementioned fine-tuned MOS transistor Msw1 sauce The drain and the power supply are connected to the ends of the fine tuning coil Lsw1 of the dual-mode 6-coil transformer, respectively, and the fine tuning MOS transistor Msw1 gate A gate fine-tuning control voltage VS1 is connected to the coarse-tuned MOS transistor Msw3. sauce The drain is connected to both ends of the coarse tuning coil Lsw3 of the dual-mode 6 coil transformer, and the coarse tuning MOS transistor Msw3 gate A gate coarse adjustment control voltage VS3 is connected to it. The sources of the cross-coupled pair MOS transistors M3 and M4 are grounded, the drains of the cross-coupled pair MOS transistors M3 and M4 are connected to both ends of the coupling resonant coil L2 of the dual-mode 6-coil transformer, and the gate of the cross-coupled pair MOS transistors M3 is connected to the drain of the cross-coupled pair MOS transistors M4. The gate of the output buffer stage MOS transistor M7 is connected to the drain of the cross-coupled pair MOS transistor M3, the source of the output buffer stage MOS transistor M7 is grounded, the drain of the output buffer stage MOS transistor M7 is connected to output OUT2P, the gate of the output buffer stage MOS transistor M8 is connected to the drain of the cross-coupled pair MOS transistor M4, the source of the output buffer stage MOS transistor M8 is grounded, and the drain of the output buffer stage MOS transistor M8 is connected to output OUT2N. The aforementioned fine-tuned MOS transistor Msw2 sauce The drain and the power supply are connected to the ends of the fine-tuning coil Lsw2 of the dual-mode 6-coil transformer, respectively, and the fine-tuning MOS transistor Msw2 gate A gate fine-tuning control voltage VS2 is connected to the coarse-tuned MOS transistor Msw4. sauce The drain and the coarse tuning coil Lsw4 of the dual-mode 6-coil transformer are respectively connected to each other, and the coarse tuning MOS transistor Msw4 gate The gate coarse adjustment control voltage VS4 is connected to this.

[0007] In the above proposed technology, the fine tuning coil Lsw1 of the dual-mode 6-coil transformer is provided on the innermost ring, and the fine tuning coil Lsw2 of the dual-mode 6-coil transformer is provided on the outermost ring. Between the fine tuning coil Lsw1 and the fine tuning coil Lsw2 of the dual-mode 6-coil transformer, the coupling resonant coil L1 of the dual-mode 6-coil transformer, the coarse tuning coil Lsw3 of the dual-mode 6-coil transformer, the coarse tuning coil Lsw4 of the dual-mode 6-coil transformer, and the coupling resonant coil L2 of the dual-mode 6-coil transformer are provided in order, thereby forming a dual-mode 6-coil transformer.

[0008] In the above proposed technology, the coarse tuning coil Lsw3 and the coarse tuning coil Lsw4 of the dual-mode 6 coil transformer are arranged as shielding coils.

[0009] In the above proposed technology, the fine tuning coil Lsw1, the fine tuning coil Lsw2, the coupling resonant coil L1, the coarse tuning coil Lsw3, the coarse tuning coil Lsw4, and the coupling resonant coil L2 of the dual-mode 6 coil transformer all use a metal with a thick upper layer.

[0010] In the above proposed technology, when the transformer of the dual-mode 6 coil is in high-frequency mode, the coupling resonant coil L1 and the fine tuning coil Lsw1 of the transformer of the dual-mode 6 coil are used, the coarse tuning MOS transistor Msw3 of the tuning switch is turned on, and the coarse tuning MOS transistor Msw4 of the tuning switch is turned off.

[0011] In the above proposed technology, when the transformer of the dual-mode 6 coil is in low-frequency mode, the coupling resonant coil L2 and the fine-tuning coil Lsw2 of the transformer of the dual-mode 6 coil are used to turn off the coarse-tuning MOS transistor Msw3 of the tuning switch and turn on the coarse-tuning MOS transistor Msw4 of the tuning switch.

[0012] In the above proposed technology, the dual-mode 6-coil transformer generates W-band signals with four frequency bands. [Effects of the Invention]

[0013] The beneficial effects of the present invention are (1) and (2) below. (1) The dual-mode W-band voltage-controlled oscillator based on magnetic tuning of a transformer according to the present invention effectively solves the problem that the quality factor (Q) of a variable capacitance diode decreases sharply with increasing frequency compared to conventional tuning methods using variable capacitance diodes, and reduces parasitic capacitance inside the resonant cavity, thereby enabling a W-band oscillator without a variable capacitance diode to achieve low phase noise and a wide frequency tuning range, and providing a reliable local oscillator signal source for generating W-band frequencies. (2) In contrast to a 3-coil single-mode transformer, the present invention employs a 6-coil dual-mode transformer, which enables the generation of ultra-wideband 4-band W-band signals, achieving not only twice the frequency tuning range but also a wider tuning range and superior phase noise performance. [Brief explanation of the drawing]

[0014] [Figure 1] This is a circuit diagram of a dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to the present invention. [Figure 2] This is a layout diagram of a dual-mode 6-coil transformer according to the present invention. [Figure 3] These are transient waveform diagrams of the voltage-controlled oscillator according to the present invention at different gate voltages. [Figure 4] This diagram shows the relationship between the gate voltage and the voltage-controlled oscillator according to the present invention when selecting different sideband frequencies. [Figure 5] This is a diagram illustrating the phase noise characteristics of the voltage-controlled oscillator according to the present invention at different gate voltages. [Modes for carrying out the invention]

[0015] The present invention will be further described below with reference to the drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0016] Referring to FIG. 1, FIG. 1 is a circuit diagram of a dual-mode W-band voltage-controlled oscillator based on magnetic synchronization of a transformer according to an embodiment of the present invention. The voltage-controlled oscillator includes two pairs of cross-coupled MOS transistors M1 and M2, M3 and M4, coupled resonance coils L1 and L2 of a dual-mode six-coil transformer, fine-tuning coils Lsw1 and Lsw2 of the dual-mode six-coil transformer, coarse-tuning coils Lsw3 and Lsw4 of the dual-mode six-coil transformer, fine-tuning MOS transistors Msw1 and Msw2 of a tuning switch, coarse-tuning MOS transistors Msw3 and Msw4 of the tuning switch, and two pairs of output buffer stage MOS transistors M5 and M6, M7 and M8.

[0017] The sources of the first pair of cross-coupled MOS transistors M1 and M2 are grounded. The gate of M1 is connected to the drain of M2, the drain of M2 is connected to the gate of M1, and the drains of M1 and M2 are connected to both ends of the coupled resonance coil L1 of the dual-mode six-coil transformer. The gate of the output buffer stage MOS transistor M5 is connected to the drain of M1, the source of M5 is grounded, and the drain of M5 is connected to output OUT1P. The gate of the output buffer stage MOS transistor M6 is connected to the drain of M2, the source of M6 is grounded, and the drain of M6 is connected to output OUT1N. The sauce gate and drain of the fine-tuning MOS transistor Msw1 are respectively connected to both ends of the fine-tuning coil Lsw1 of the dual-mode six-coil transformer. A gate fine-tuning control voltage VS1 is connected to the gate gate of Msw1. The sauce gate and drain of the coarse-tuning MOS transistor Msw3 are respectively connected to both ends of the coarse-tuning coil Lsw3 of the dual-mode six-coil transformer. A gate coarse-tuning control voltage VS3 is connected to the gate gate of Msw3.

[0018] The sources of the second pair of cross-coupled MOS transistors M3 and M4 are grounded, the gate of M3 is connected to the drain of M4, the drain of M4 is connected to the gate of M3, the drains of M3 and M4 are connected to both ends of the coupling resonant coil L2 of the dual-mode 6-coil transformer, the gate of the output buffer stage MOS transistor M7 is connected to the drain of M3, the source of M7 is grounded, the drain of M7 is connected to output OUT2P, the gate of the output buffer stage MOS transistor M8 is connected to the drain of M4, the source of M8 is grounded, the drain of M8 is connected to output OUT2N, and the fine-tuned MOS transistor Msw2 sauce The drain is connected to both ends of the fine tuning coil Lsw2 of the dual-mode 6-coil transformer, and Msw2 gate A gate fine-tuning control voltage VS2 is connected to the above coarse-tuned MOS transistor Msw4. sauce The drain is connected to both ends of the coarse tuning coil Lsw4 of the dual-mode 6-coil transformer, and Msw4 gate The gate coarse adjustment control voltage VS4 is connected to this.

[0019] In this embodiment, the two pairs of cross-coupled MOS transistors provide negative resistance to compensate for the resonant cavity loss. The resulting parasitic capacitance and the equivalent inductance of the dual-mode 6-coil transformer form a resonant cavity, generating an oscillation signal. When the coarse-tuned MOS transistors Msw3 and Msw4 of the tuning switch are turned on, their equivalent inductance is small, forming a high-frequency band. When they are turned off, their equivalent inductance is large, forming a low-frequency band. The gate voltages (VS1 and VS2) of the fine-tuned MOS transistors Msw1 and Msw2 of the tuning switch change their resistances (Rsw1 and Rsw2), achieving fine tuning of the equivalent inductance.

[0020] Referring to Figure 2, Figure 2 is a layout diagram of a dual-mode 6-coil transformer according to an embodiment of the present invention, which includes coupled resonant coils L1 and L2, fine-tuning coils Lsw1 and Lsw2, and coarse-tuning coils Lsw3 and Lsw4, with coarse-tuning coils Lsw3 and Lsw4 positioned as shielding coils, placed between L1 and L2 to reduce the coupling coefficient between resonant coils L1 and L2, and at any given time only one of Lsw3 and Lsw4 can be used, with fine-tuning coil Lsw1 positioned on the innermost ring to complete the fine-tuning to the equivalent inductance L1eq by magnetic tuning with L1, and fine-tuning coil Lsw2 positioned on the outermost ring, L By magnetic tuning with 2, fine tuning with respect to the equivalent inductance L2eq is completed, and all coils use a thick metal upper layer to reduce losses. In the above dual-mode 6-coil transformer, when simulated at 100 GHz, the self-inductance values ​​of the coupled resonant coils L1 and L2 are 110 pH and 134 pH, respectively, the self-inductance values ​​of the fine-tuning coils Lsw1 and Lsw2 are 72 pH and 183 pH, respectively, the self-inductance values ​​of the coarse-tuning coils Lsw3 and Lsw4 are 86 pH and 104 pH, respectively, and the coupling coefficient between the coupled resonant coils L1 and L2 is 0.32.

[0021] In this embodiment, the dual-mode 6-coil transformer operates in high-frequency mode with only power supply VDD1 applied, using the coupled resonant coil L1 and fine-tuning coil Lsw1, while coarse-tuning coils Lsw3 and Lsw4 are switched on and off, respectively. In low-frequency mode, only power supply VDD2 is applied, using the coupled resonant coil L2 and fine-tuning coil Lsw2, while coarse-tuning coils Lsw3 and Lsw4 are switched off and on, respectively. To ensure the stability of dual-mode operation, coarse-tuning coils Lsw3 and Lsw4 are positioned as shielding coils, reducing the coupling coefficient of coupled resonant coils L1 and L2, and at any given time, only one of the coarse-tuning coils Lsw3 or Lsw4 is open.

[0022] The advantages of the single-mode W-band voltage-controlled oscillator based on the magnetic tuning of the transformer of the present invention will be further explained below through simulation experiments.

[0023] This embodiment uses a 40nm CMOS process to manufacture a dual-mode W-band voltage-controlled oscillator. The process has one poly layer and ten metal layers, of which the transformer structure is primarily realized with 10 thick metal layers. The parameters of the dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of the transformer in this embodiment are shown in Table 1. [Table 1]

[0024] Referring to Figure 3, Figure 3 is a transient waveform diagram of a dual-mode W-band voltage-controlled oscillator based on magnetic tuning of a transformer according to an embodiment of the present invention, when the power supply VDD1 is turned on using the high-frequency mode, the coupling resonant coil L1 and the coarse-tuned MOS transistor Msw3 of the tuning switch are turned on, the coarse-tuned MOS transistor Msw4 of the tuning switch is turned off, and the fine-tuned MOS transistor Msw1 of the tuning switch has a different gate voltage. As can be seen from the simulation waveform, after the oscillation ends, the amplitude of the voltage-controlled oscillator reaches 1.2V, and as the gate voltage of the fine-tuned MOS transistor Msw1 gradually increases, the amplitude of the voltage-controlled oscillator decreases slightly.

[0025] Table 2 shows the truth tables for each sideband selection of the dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of the transformer in this embodiment. [Table 2]

[0026] Referring to Figure 4, Figure 4 is a diagram showing the relationship between the gate voltage and the magnetic tuning of a dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to an embodiment of the present invention when different sideband frequencies are selected. By selecting the arrangement method in Table 2, four different output frequency sidebands can be obtained. As can be seen from the simulated output waveform, continuous adjustment of the output frequency is achieved by controlling the fine-tuned MOS transistor Msw1 (Msw2), and sideband adjustment of the output frequency is achieved by controlling the coarse-tuned MOS transistor Msw3 (Msw4) of the tuning switch, resulting in an output frequency range of 85 to 108 GHz and a wide bandwidth frequency tuning range of 23.8%.

[0027] Referring to Figure 5, Figure 5 is a phase noise characteristic diagram of a dual-mode W-band voltage-controlled oscillator based on magnetic tuning of a transformer according to an embodiment of the present invention, when the power supply VDD1 is turned on using the high-frequency mode, the coupling resonant coil L1 and the coarse-tuned MOS transistor Msw3 of the tuning switch are turned on, the coarse-tuned MOS transistor Msw4 of the tuning switch is turned off, and the fine-tuned MOS transistor Msw1 of the tuning switch has a different gate voltage. As can be seen from the phase noise characteristic diagram, as the gate voltage increases, the quality factor (Q) of the dual-mode 6-coil transformer gradually decreases. Therefore, when the output frequency is around 100 GHz, as the gate voltage increases, the output phase noise of the voltage-controlled oscillator gradually increases from -107.36 dBc / Hz @ 10 MHz to -102.31 dBc / Hz @ 10 MHz. Since it is not tuned using a switch capacitor array and a variable capacitance diode, a wide frequency tuning range and high phase noise performance are achieved at an output frequency of 100 GHz.

[0028] The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any improvements, substitutions, or modifications that can be carried out by those skilled in the art without departing from the spirit of the present invention are all within the scope of protection of the present invention.

Claims

1. It includes cross-coupled pair MOS transistors M1, M2, M3, and M4, a coupling resonant coil L1 and L2 of a dual-mode 6-coil transformer, a fine-tuning coil Lsw1 and Lsw2 of a dual-mode 6-coil transformer, a coarse-tuning coil Lsw3 and Lsw4 of a dual-mode 6-coil transformer, a fine-tuning MOS transistor Msw1, Msw2 of a tuning switch, a coarse-tuning MOS transistor Msw3 and Msw4 of a tuning switch, an output buffer stage MOS transistor M5, an output buffer stage MOS transistor M6, an output buffer stage MOS transistor M7, and an output buffer stage MOS transistor M8. The sources of the cross-coupled pair MOS transistors M1 and M2 are grounded, the drains of the cross-coupled pair MOS transistors M1 and M2 are connected to both ends of the coupling resonant coil L1 of the dual-mode 6-coil transformer, and the gate of the cross-coupled pair MOS transistor M1 is connected to the drain of the cross-coupled pair MOS transistor M2. The gate of the output buffer stage MOS transistor M5 is connected to the drain of the cross-coupled pair MOS transistor M1, the source of the output buffer stage MOS transistor M5 is grounded, the drain of the output buffer stage MOS transistor M5 is connected to output OUT1P, the gate of the output buffer stage MOS transistor M6 is connected to the drain of the cross-coupled pair MOS transistor M2, the source of the output buffer stage MOS transistor M6 is grounded, and the drain of the output buffer stage MOS transistor M6 is connected to output OUT1N. The source and drain of the finely tuned MOS transistor Msw1 are connected to the ends of the finely tuned coil Lsw1 of the dual-mode 6-coil transformer, respectively, and the gate of the finely tuned MOS transistor Msw1 is connected to a gate fine adjustment control voltage VS1. The source and drain of the coarsely tuned MOS transistor Msw3 are connected to the ends of the coarsely tuned coil Lsw3 of the dual-mode 6-coil transformer, respectively, and the gate of the coarsely tuned MOS transistor Msw3 is connected to a gate coarse adjustment control voltage VS3. The sources of the cross-coupled pair MOS transistors M3 and M4 are grounded, the drains of the cross-coupled pair MOS transistors M3 and M4 are connected to both ends of the coupling resonant coil L2 of the dual-mode 6-coil transformer, and the gate of the cross-coupled pair MOS transistors M3 is connected to the drain of the cross-coupled pair MOS transistors M4. The gate of the output buffer stage MOS transistor M7 is connected to the drain of the cross-coupled pair MOS transistor M3, the source of the output buffer stage MOS transistor M7 is grounded, the drain of the output buffer stage MOS transistor M7 is connected to output OUT2P, the gate of the output buffer stage MOS transistor M8 is connected to the drain of the cross-coupled pair MOS transistor M4, the source of the output buffer stage MOS transistor M8 is grounded, and the drain of the output buffer stage MOS transistor M8 is connected to output OUT2N. A dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer, characterized in that the source and drain of the fine-tuned MOS transistor Msw2 are connected to the ends of the fine-tuned coil Lsw2 of the dual-mode 6-coil transformer, respectively, and a gate fine-tuning control voltage VS2 is connected to the gate of the fine-tuned MOS transistor Msw2, and the source and drain of the coarse-tuned MOS transistor Msw4 are connected to the ends of the coarse-tuning coil Lsw4 of the dual-mode 6-coil transformer, respectively, and a gate coarse-tuning control voltage VS4 is connected to the gate of the coarse-tuned MOS transistor Msw4.

2. The dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to claim 1, characterized in that the fine tuning coil Lsw1 of the dual-mode 6-coil transformer is provided on the innermost ring, the fine tuning coil Lsw2 of the dual-mode 6-coil transformer is provided on the outermost ring, and the coupling resonant coil L1 of the dual-mode 6-coil transformer, the coarse tuning coil Lsw3 of the dual-mode 6-coil transformer, the coarse tuning coil Lsw4 of the dual-mode 6-coil transformer, and the coupling resonant coil L2 of the dual-mode 6-coil transformer are provided in order between the fine tuning coil Lsw1 and the fine tuning coil Lsw2 of the dual-mode 6-coil transformer, thereby forming a dual-mode 6-coil transformer.

3. The dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to claim 2, characterized in that the coarse tuning coil Lsw3 and the coarse tuning coil Lsw4 of the dual-mode 6-coil transformer are arranged as shield coils.

4. A dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to claim 3, characterized in that the fine tuning coil Lsw1, the fine tuning coil Lsw2, the coupling resonant coil L1, the coarse tuning coil Lsw3, the coarse tuning coil Lsw4, and the coupling resonant coil L2 of the dual-mode 6-coil transformer all use a metal with a thick upper layer.

5. A dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to claim 2, characterized in that when the transformer of the dual-mode 6-coil is in high-frequency mode, the coupling resonant coil L1 and the fine tuning coil Lsw1 of the transformer of the dual-mode 6-coil are used, the coarse tuning MOS transistor Msw3 of the tuning switch is turned on, and the coarse tuning MOS transistor Msw4 of the tuning switch is turned off.

6. A dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of a transformer according to claim 5, characterized in that when the transformer of the dual-mode 6-coil is in low-frequency mode, the coupling resonant coil L2 and the fine tuning coil Lsw2 of the transformer of the dual-mode 6-coil are used, the coarse tuning MOS transistor Msw3 of the tuning switch is turned off, and the coarse tuning MOS transistor Msw4 of the tuning switch is turned on.

7. The dual-mode W-band voltage-controlled oscillator based on the magnetic tuning of the transformer according to claim 6, characterized in that the transformer of the dual-mode 6 coil generates W-band signals of four bandwidths.

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