Millimeter wave low-noise amplifier, electronic circuit and electronic equipment

Abstract

The invention provides a millimeter wave low noise amplifier, an electronic circuit and electronic equipment. An input matching unit is used for performing first conversion and first broadband matching on an input radio frequency signal and outputting the radio frequency signal; the first amplification unit is used for carrying out primary amplification on the input radio frequency signal and outputting the radio frequency signal; performing second conversion and second broadband matching on the input radio frequency signal through the first inter-stage matching unit, and outputting the radio frequency signal; the Cascode amplification unit is used for carrying out secondary amplification and third broadband matching on the input radio frequency signal and outputting the radio frequency signal; carrying out fourth conversion and fourth broadband matching on the input radio-frequency signal through an output matching unit, and outputting the radio-frequency signal; wherein the input matching unit and the output matching unit realize impedance matching; in the Cascode amplification unit, a second inter-electrode matching subunit is arranged between a Cascode lower-stage amplification subunit and a Cascode upper-stage amplification subunit, so that broadband matching and transconductance enhancement between the Cascode lower-stage amplification subunit and the Cascode upper-stage amplification subunit are realized, and the gain and the stability of the amplifier are further improved.

Description

Technical Field

[0001] The present invention relates to the field of amplifiers, and in particular to a millimeter wave low noise amplifier, an electronic circuit and an electronic device Background Art

[0002] In recent years, as microwave low-frequency spectrum resources are gradually exhausted, millimeter-wave resources have attracted more and more attention from researchers in both military and civilian fields. In transmitter systems, millimeter-wave low-noise amplifiers require high gain and low noise coefficient to suppress the noise of subsequent modules. However, since the millimeter-wave frequency is close to the characteristic frequency of transistors, the gain of millimeter-wave low-noise amplifiers is usually low.

[0003] Therefore, in order to improve the gain of millimeter-wave low-noise amplifiers, traditional technologies generally use multi-stage amplifier cascades. However, the problem with this solution is that the circuit stability is poor, and the inter-stage matching of each stage of amplification is usually a narrowband characteristic, which makes the gain easily affected by process deviations.

[0004] In order to solve the problems existing in traditional technologies, existing technologies usually improve the inter-stage matching network, and design an inter-stage matching network with broadband characteristics by controlling the parameters of inductance and capacitance, so that the gain can remain stable in a wider frequency range. However, this only reduces the process deviation of the gain, and the stability problem of the circuit is not solved. In addition, the circuit gain still cannot meet the demand, and there is still room for improvement.

[0005] Therefore, providing a high-gain, high-stability millimeter-wave low-noise amplifier has become a technical problem that the industry urgently needs to solve. Summary of the invention

[0006] The present invention provides a millimeter wave low noise amplifier, an electronic circuit and an electronic device to achieve high gain and high stability of the millimeter wave low noise amplifier.

[0007] According to one aspect of the present invention, there is provided a millimeter wave low noise amplifier for low-noise amplification of a first radio frequency signal, comprising:

[0008] An input matching unit, the input matching unit is used to perform a first conversion and a first broadband matching on the input first radio frequency signal, and output a second radio frequency signal; the input matching unit is also used to match the input impedance to a first set value;

[0009] a first amplifying unit, whose input end is coupled to the output end of the input matching unit; the first amplifying unit is used to perform a first stage amplification on the second radio frequency signal and output a third radio frequency signal;

[0010] A first inter-stage matching unit, whose input end is coupled to the output end of the first-stage amplifying subunit; the first inter-stage matching unit is used to perform a second conversion and a second broadband matching on the input third radio frequency signal, and output a fourth radio frequency signal;

[0011] A Cascode amplifying unit, comprising a Cascode lower-stage amplifying subunit, a second inter-stage matching subunit, and a Cascode upper-stage amplifying subunit; an input end of the Cascode lower-stage amplifying subunit is coupled to an output end of the first inter-stage matching unit, and the Cascode lower-stage amplifying subunit is used to perform a second-stage amplification on the fourth radio frequency signal and output a fifth radio frequency signal; an input end of the second inter-stage matching subunit is coupled to an output end of the Cascode lower-stage amplifying subunit, and the second inter-stage matching subunit is used to perform a third conversion and a third broadband matching on the fifth radio frequency signal and output a sixth radio frequency signal; an input end of the Cascode upper-stage amplifying subunit is coupled to an output end of the second inter-stage matching subunit, and the Cascode upper-stage amplifying subunit is used to perform a third-stage amplification on the sixth radio frequency signal and output a seventh radio frequency signal;

[0012] An output matching unit, whose input end is coupled to the output end of the Cascode upper-stage amplifier subunit, and the output matching unit is used to perform a fourth conversion and a fourth broadband matching on the seventh RF signal, and output an eighth RF signal as the output signal of the millimeter-wave low-noise amplifier; the output matching unit is also used to match the output impedance to a second set value; wherein the first set value is equal to the second set value.

[0013] Optionally, the Cascode lower-level amplifier unit includes a first transistor, a second transistor, a first capacitor, and a second capacitor;

[0014] The control end of the first transistor and the control end of the second transistor serve together as the input end of the Cascode lower-stage amplifier subunit, the first end of the first transistor is coupled to the first end of the second transistor and is grounded; the second end of the first transistor and the second end of the second transistor serve together as the output end of the Cascode lower-stage amplifier subunit; the first capacitor is coupled between the control end of the first transistor and the second end of the second transistor, and the second capacitor is coupled between the second end of the first transistor and the control terminal of the second transistor.

[0015] Optionally, the second inter-stage matching subunit includes a first transformer, the primary side of the first transformer serves as the input end of the second inter-stage matching subunit and is coupled between the second end of the first transistor and the second end of the second transistor; the first secondary side of the first transformer is electrically connected to the primary side of the first transformer to provide a first bias current for the primary side of the first transformer; the second secondary side of the first transformer serves as the output end of the second inter-stage matching subunit.

[0016] Optionally, the Cascode upper-level amplifier subunit includes a third transistor and a fourth transistor; the control end of the third transistor and the control end of the fourth transistor jointly serve as the input end of the Cascode upper-level amplifier subunit, and are respectively coupled to the first end and the second end of the second secondary side of the first transformer; the first end of the third transistor and the first end of the fourth transistor are respectively coupled to the first end and the second end of the first secondary side of the first transformer to provide the first bias current for the first secondary side of the first transformer; the second end of the third transistor and the second end of the fourth transistor jointly serve as the output end of the Cascode upper-level amplifier subunit.

[0017] Optionally, the input matching unit includes a second transformer, a primary side of the second transformer serves as an input end of the input matching unit, and a second secondary side of the second transformer serves as an output end of the input matching unit.

[0018] Optionally, the first amplifying unit includes a fifth transistor and a sixth transistor; the control end of the fifth transistor and the control end of the sixth transistor serve together as the input end of the first amplifying unit, and are respectively coupled to the first end and the second end of the second secondary side of the second transformer; the first end of the fifth transistor and the first end of the sixth transistor are respectively coupled to the first end and the second end of the first secondary side of the second transformer; the second end of the fifth transistor and the second end of the sixth transistor serve together as the output end of the first amplifying unit.

[0019] Optionally, the first to sixth transistors each include at least one of a MOS transistor and a triode.

[0020] Optionally, the first transformer and the second transformer both include three-coil transformers.

[0021] Optionally, the first inter-stage matching unit includes a third transformer, the primary side of the third transformer serves as the input end of the first inter-stage matching unit and is coupled between the second end of the fifth transistor and the second end of the sixth transistor; the secondary side of the third transformer serves as the output end of the first inter-stage matching unit and is coupled between the control end of the first transistor and the control end of the second transistor.

[0022] Optionally, the output matching unit includes a fourth transformer, the primary side of the fourth transformer serves as the input end of the output matching unit and is coupled to the second end of the third transistor and the second end of the fourth transistor; the secondary side of the fourth transformer serves as the output end of the output matching unit to output the eighth RF signal.

[0023] Optionally, the third transformer and the fourth transformer both comprise double-coil transformers, and the second transformer and the third transformer both are low-coupling transformers.

[0024] According to a second aspect of the present invention, there is provided an electronic circuit comprising the millimeter wave low noise amplifier provided by the first aspect and optional solutions of the present invention.

[0025] According to a third aspect of the present invention, an electronic device is provided, comprising the electronic circuit provided by the second aspect of the present invention.

[0026] The millimeter wave low noise amplifier provided by the present invention realizes broadband matching and transconductance enhancement between the Cascode lower-stage amplifying subunit and the Cascode upper-stage amplifying subunit by setting a second inter-stage matching subunit between the Cascode lower-stage amplifying subunit and the Cascode upper-stage amplifying subunit, thereby improving the gain and stability of the amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 A module diagram of a millimeter wave low noise amplifier provided for the first embodiment of the present invention;

[0029] Figure 2 This is a circuit structure diagram of a millimeter wave low noise amplifier provided in the first embodiment of the present invention.

[0030] Reference numerals:

[0031] 10- Input matching unit;

[0032] 10- second transformer;

[0033] 20-a first amplifying unit;

[0034] 30- first level inter-matching unit;

[0035] 30- the third transformer;

[0036] 40-Cascode amplification unit;

[0037] 41-Cascode lower level amplification subunit;

[0038] 42-second level inter-matching subunit;

[0039] 42- first transformer;

[0040] 43-Cascode upper amplifier subunit;

[0041] 50-output matching unit;

[0042] 50- fourth transformer;

[0043] Q1 - first transistor;

[0044] Q2 - second transistor;

[0045] Q3 - the third transistor;

[0046] Q4 - the fourth transistor;

[0047] Q5 - fifth transistor;

[0048] Q6 - the sixth transistor;

[0049] C1-first capacitor;

[0050] C2-second capacitor;

[0051] Vin-first radio frequency signal;

[0052] Vout-eighth RF signal. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] Please refer to Figure 1 The first embodiment of the invention provides a millimeter wave low noise amplifier for low noise amplification of a first radio frequency signal Vin, comprising:

[0055] An input matching unit 10, the input matching unit 10 is used to perform a first conversion and a first broadband matching on the input first radio frequency signal Vin, and output a second radio frequency signal; the input matching unit 10 is also used to match the input impedance to a first set value;

[0056] A first amplifying unit 20, whose input end is coupled to the output end of the input matching unit 10; the first amplifying unit 20 is used to perform a first stage amplification on the second RF signal and output a third RF signal;

[0057] A first inter-stage matching unit 30, whose input end is coupled to the output end of the first-stage amplifying subunit; the first inter-stage matching unit 30 performs a second conversion and a second broadband matching on the input third RF signal, and outputs a fourth RF signal;

[0058] The Cascode amplifying unit 40 comprises a Cascode lower-stage amplifying subunit 43, a second inter-stage matching subunit 42, and a Cascode upper-stage amplifying subunit 43; the input end of the Cascode lower-stage amplifying subunit 43 is coupled to the output end of the first inter-stage matching unit 30, and the Cascode lower-stage amplifying subunit 43 is used to perform a second-stage amplification on the fourth radio frequency signal and output a fifth radio frequency signal; the input end of the second inter-stage matching subunit 42 is coupled to the output end of the Cascode lower-stage amplifying subunit 43, and the second inter-stage matching subunit 42 is used to perform a third conversion and a third broadband matching on the fifth radio frequency signal and output a sixth radio frequency signal; the input end of the Cascode upper-stage amplifying subunit 43 is coupled to the output end of the second inter-stage matching subunit 42, and the Cascode upper-stage amplifying subunit 43 is used to perform a third-stage amplification on the sixth radio frequency signal and output a seventh radio frequency signal;

[0059] An output matching unit 50, whose input end is coupled to the output end of the Cascode upper-stage amplifier subunit 43, is used to perform a fourth conversion and a fourth broadband matching on the seventh RF signal, and output an eighth RF signal Vout as the output signal of the millimeter-wave low-noise amplifier; the output matching unit 50 is also used to match the output impedance to a second set value; wherein the first set value is equal to the second set value.

[0060] Please refer to Figure 1 The first embodiment of the present invention uses the above technical means to achieve high gain, high stability, and impedance matching of the millimeter wave low noise amplifier. The specific principle is:

[0061] To achieve high gain and high stability of the millimeter-wave low-noise amplifier: by setting a second inter-pole matching subunit between the Cascode lower pole amplifying subunit and the Cascode upper pole amplifying subunit, broadband matching and transconductance enhancement are performed on the Cascode lower pole amplifying subunit and the Cascode upper pole amplifying subunit, thereby improving the gain and stability of the Cascode amplifying unit 40. Finally, by improving the gain and stability of the Cascode amplifying unit 40, the overall gain and stability of the millimeter-wave low-noise amplifier are improved. Among them, improving the stability of the millimeter-wave low-noise amplifier is specifically: improving the stability coefficient of the circuit; when the stability coefficient of the circuit is greater than 1, the circuit is not easy to oscillate; when the stability coefficient of the circuit is less than 1, the circuit is prone to oscillation.

[0062] For the impedance matching of the millimeter wave low noise amplifier: the input impedance is adjusted to the first set value through the input matching unit 10, and the output impedance is adjusted to the second set value through the output matching unit 50, and the first set value is equal to the second set value to achieve impedance matching. And realizing impedance matching is conducive to improving the output power of the amplifier. The specific principle is: first assume that the amplifier is a pure resistance circuit, so that the reactance value caused by inductance and capacitance can be basically ignored. At this time, the impedance source of the circuit is mainly resistance. Therefore, the current in the circuit is equal to U / (R+r); wherein U is used to characterize the voltage of the input signal; R is used to characterize the output impedance; r is used to characterize the input impedance. And the output power is equal to I*I*R; wherein I is used to characterize the current in the circuit. Combined with the above formula, it can be seen that when R=r, the output power is the largest. Therefore, impedance matching is conducive to improving the output power of the amplifier. Among them, the first set value and the second set value are usually 50Ω or 75Ω in the field of radio frequency. In the first embodiment of the present invention, it is specifically set to 50Ω. Of course, other settings can be made according to actual needs, which are not limited here.

[0063] The following describes the various circuit structures of the millimeter wave low noise amplifier:

[0064] Please refer to Figure 2 As a specific implementation, the Cascode lower-stage amplifier unit 43 includes a first transistor Q1, a second transistor Q2, a first capacitor C1, and a second capacitor C2;

[0065] The control end of the first transistor Q1 and the control end of the second transistor Q2 serve together as the input end of the Cascode lower-stage amplifier unit 43, the first end of the first transistor Q1 is coupled to the first end of the second transistor Q2 and is grounded; the second end of the first transistor Q1 and the second end of the second transistor Q2 serve together as the output end of the Cascode lower-stage amplifier unit 43; the first capacitor C1 is coupled between the control end of the first transistor Q1 and the second end of the second transistor Q2, and the second capacitor C2 is coupled between the second end of the first transistor Q1 and the control terminal of the second transistor Q2.

[0066] Please refer to Figure 2 The second inter-stage matching subunit 42 includes a first transformer 42, the primary side of the first transformer 42 serves as the input end of the second inter-stage matching subunit 42 and is coupled between the second end of the first transistor Q1 and the second end of the second transistor Q2; the first secondary side of the first transformer 42 is electrically connected to the primary side of the first transformer 42 to provide a first bias current for the primary side of the first transformer 42; the second secondary side of the first transformer 42 serves as the output end of the second inter-stage matching subunit 42.

[0067] Please refer to Figure 2 , the Cascode upper-stage amplifier subunit 43 includes a third transistor Q3 and a fourth transistor Q4; the control end of the third transistor Q3 and the control end of the fourth transistor Q4 are jointly used as the input end of the Cascode upper-stage amplifier subunit 43, and are respectively coupled to the first end and the second end of the second secondary side of the first transformer 42; the first end of the third transistor Q3 and the first end of the fourth transistor Q4 are respectively coupled to the first end and the second end of the first secondary side of the first transformer 42 to provide the first bias current for the first secondary side of the first transformer 42; the second end of the third transistor Q3 and the second end of the fourth transistor Q4 are jointly used as the output end of the Cascode upper-stage amplifier subunit 43.

[0068] Specifically: if the first transistor Q1 to the fourth transistor Q4 are all MOS tubes, then the Cascode amplifier unit 40 is specifically a common source and common gate amplifier; the Cascode lower pole amplifier subunit is specifically the common source of the common source and common gate amplifier, and the Cascode upper pole amplifier subunit is specifically the common gate of the common source and common gate amplifier, and the first transformer 42 is arranged between the common source and the common gate to perform broadband matching and transconductance enhancement on the common source and the common gate, so as to improve the gain and stability of the Cascode amplifier unit 40. Among them, the first transformer 42 specifically includes a three-coil transformer, and may also include a two-coil transformer, which can be selected according to actual needs and is not limited here. Of course, in addition to MOS tubes, the first transistor Q1 to the fourth transistor Q4 may also include other types of transistors; for example, triodes, which are not limited here.

[0069] Please refer to Figure 2As a specific implementation, the input matching unit 10 includes a second transformer 10, the primary side of the second transformer 10 serves as the input end of the input matching unit 10, and the second secondary side of the second transformer 10 serves as the output end of the input matching unit 10. The first amplifying unit 20 includes a fifth transistor Q5 and a sixth transistor Q6; the control end of the fifth transistor Q5 and the control end of the sixth transistor Q6 serve as the input end of the first amplifying unit 20, and are respectively coupled to the first end and the second end of the second secondary side of the second transformer 10; the first end of the fifth transistor Q5 and the first end of the sixth transistor Q6 are respectively coupled to the first end and the second end of the first secondary side of the second transformer 10, and the first secondary side of the second transformer 10 is grounded; the second end of the fifth transistor Q5 and the second end of the sixth transistor Q6 serve as the output end of the first amplifying unit 20. The second transformer 10 is specifically a three-coil transformer, and the input matching and noise broadband matching are simultaneously completed by the three-coil transformer. At the same time, compared with the common-gate amplifier in the prior art, the gain of the first amplifying unit 20 is improved by the three-coil transformer to save the use of the neutralizing capacitor, thereby improving the stability of the circuit; the reason is that the process deviation of the neutralizing capacitor is likely to deteriorate the stability of the circuit. Among them, if the fifth transistor Q5 and the sixth transistor Q6 are both MOS tubes, then the first amplifying unit 20 is specifically a common-source amplifier. Of course, in addition to MOS tubes, the fifth transistor Q5 to the sixth transistor Q6 may also include other types of transistors; for example, triodes, which are not limited here.

[0070] Please refer to Figure 2 The output matching unit 50 includes a fourth transformer 50, the primary side of the fourth transformer 50 is used as the input end of the output matching unit 50, and is coupled to the second end of the third transistor Q3 and the second end of the fourth transistor Q4; the secondary side of the fourth transformer 50 is used as the output end of the output matching unit 50 to output the eighth RF signal Vout. The fourth transformer 50 performs the fourth broadband matching on the seventh RF signal, specifically dual-resonance peak gain broadband matching.

[0071] Please refer to Figure 2, the first inter-stage matching unit 30 includes a third transformer 30, the primary side of the third transformer 30 is used as the input end of the first inter-stage matching unit 30, and is coupled between the second end of the fifth transistor Q5 and the second end of the sixth transistor Q6; the secondary side of the third transformer 30 is used as the output end of the first inter-stage matching unit 30, and is coupled between the control end of the first transistor Q1 and the control end of the second transistor Q2. Wherein, the third transformer 30 performs a second broadband matching on the third RF signal, which is also a double resonance peak gain broadband matching. As a preferred embodiment, in addition to increasing the bandwidth through double resonance peak gain broadband matching, the second transformer 10 and the third transformer 30 are both low-coupling transformers, and the bandwidth is further increased by reducing the magnetic field coupling coefficient of the transformer; wherein, the increase in bandwidth can not only ensure the effectiveness of impedance matching in a wide range to reduce the impact of process deviation on circuit performance, but also maintain the stability of gain in a wide range to simultaneously reduce the impact of process deviation on gain.

[0072] As a specific implementation, the third transformer and the fourth transformer 50 are both double-coil transformers, and the primary side of the third transformer 30 and the primary side of the fourth transformer 50 are both coupled to a bias voltage source to bias the primary side of the third transformer 30 and the primary side of the fourth transformer 50 respectively.

[0073] In summary, the millimeter-wave low-noise amplifier provided in the first embodiment of the present invention realizes broadband matching and transconductance enhancement between the Cascode lower pole amplifying subunit and the Cascode upper pole amplifying subunit by setting a second inter-pole matching subunit between the Cascode lower pole amplifying subunit and the Cascode upper pole amplifying subunit, thereby improving the gain and stability of the millimeter-wave low-noise amplifier. The second transformer with three coils is also set to further improve the stability of the millimeter-wave low-noise amplifier. Impedance matching is also performed by setting the input matching unit and the output matching unit to maximize the output power; the second transformer and the third transformer are also set to be low-coupling transformers to increase the bandwidth and reduce the impact of process deviations on circuit performance and gain.

[0074] A second embodiment of the present invention provides an electronic circuit including the millimeter wave low noise amplifier.

[0075] A third embodiment of the present invention provides an electronic device, comprising the electronic circuit.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A millimeter wave low noise amplifier, used for low noise amplification of a first radio frequency signal, It is characterized in that include: An input matching unit, the input matching unit is used to perform a first conversion and a first broadband matching on the input first radio frequency signal, and output a second radio frequency signal; the input matching unit is also used to match the input impedance to a first set value; a first amplifying unit, whose input end is coupled to the output end of the input matching unit; the first amplifying unit is used to perform a first stage amplification on the second radio frequency signal and output a third radio frequency signal; A first inter-stage matching unit, whose input end is coupled to the output end of the first-stage amplifying subunit; the first inter-stage matching unit is used to perform a second conversion and a second broadband matching on the input third radio frequency signal, and output a fourth radio frequency signal; A Cascode amplifying unit, comprising a Cascode lower-stage amplifying subunit, a second inter-stage matching subunit, and a Cascode upper-stage amplifying subunit; an input end of the Cascode lower-stage amplifying subunit is coupled to an output end of the first inter-stage matching unit, and the Cascode lower-stage amplifying subunit is used to perform a second-stage amplification on the fourth radio frequency signal and output a fifth radio frequency signal; The input end of the second inter-stage matching subunit is coupled to the output end of the Cascode lower-stage amplification subunit, and the second inter-stage matching subunit is used to perform a third conversion and a third broadband matching on the fifth RF signal, and output a sixth RF signal; The input end of the Cascode upper-stage amplifying subunit is coupled to the output end of the second inter-stage matching subunit, and the Cascode upper-stage amplifying subunit is used to perform a third-stage amplification on the sixth radio frequency signal and output a seventh radio frequency signal; An output matching unit, whose input end is coupled to the output end of the Cascode upper-stage amplifier subunit, and the output matching unit is used to perform a fourth conversion and a fourth broadband matching on the seventh RF signal, and output an eighth RF signal as the output signal of the millimeter-wave low-noise amplifier; the output matching unit is also used to match the output impedance to a second set value; wherein the first set value is equal to the second set value.

2. The millimeter wave low noise amplifier according to claim 1, It is characterized in that The Cascode lower-stage amplifier subunit includes a first transistor, a second transistor, a first capacitor, and a second capacitor; The control end of the first transistor and the control end of the second transistor are used together as the input end of the Cascode lower-stage amplifier subunit, the first end of the first transistor is coupled to the first end of the second transistor and is grounded; the second end of the first transistor and the second end of the second transistor are used together as the output end of the Cascode lower-stage amplifier subunit; The first capacitor is coupled between the control terminal of the first transistor and the second terminal of the second transistor, and the second capacitor is coupled between the second terminal of the first transistor and the control terminal of the second transistor.

3. The millimeter wave low noise amplifier according to claim 2, It is characterized in that The second inter-stage matching subunit includes a first transformer, a primary side of the first transformer serves as an input end of the second inter-stage matching subunit and is coupled between a second end of the first transistor and a second end of the second transistor; The first secondary side of the first transformer is electrically connected to the primary side of the first transformer to provide a first bias current for the primary side of the first transformer; The second secondary side of the first transformer serves as an output end of the second inter-stage matching subunit.

4. The millimeter wave low noise amplifier according to claim 3, It is characterized in that The Cascode upper-stage amplifier subunit includes a third transistor and a fourth transistor; the control end of the third transistor and the control end of the fourth transistor are jointly used as the input end of the Cascode upper-stage amplifier subunit, and are respectively coupled to the first end and the second end of the second secondary side of the first transformer; the first end of the third transistor and the first end of the fourth transistor are respectively coupled to the first end and the second end of the first secondary side of the first transformer to provide the first bias current for the first secondary side of the first transformer; the second end of the third transistor and the second end of the fourth transistor are jointly used as the output end of the Cascode upper-stage amplifier subunit.

5. The millimeter wave low noise amplifier according to claim 4, It is characterized in that The input matching unit includes a second transformer, a primary side of the second transformer serves as an input end of the input matching unit, and a second secondary side of the second transformer serves as an output end of the input matching unit.

6. The millimeter wave low noise amplifier according to claim 5, It is characterized in that The first amplifying unit includes a fifth transistor and a sixth transistor; the control end of the fifth transistor and the control end of the sixth transistor serve together as an input end of the first amplifying unit and are respectively coupled to the first end and the second end of the second secondary side of the second transformer; the first end of the fifth transistor and the first end of the sixth transistor are respectively coupled to the first end and the second end of the first secondary side of the second transformer; the second end of the fifth transistor and the second end of the sixth transistor serve together as an output end of the first amplifying unit.

7. The millimeter wave low noise amplifier according to claim 6, It is characterized in that The first transistor to the sixth transistor each include at least one of a MOS transistor and a triode.

8. The millimeter wave low noise amplifier according to claim 6, It is characterized in that The first transformer and the second transformer each include a three-coil transformer.

9. The millimeter wave low noise amplifier according to claim 6, It is characterized in that The first inter-stage matching unit includes a third transformer, the primary side of the third transformer serves as the input end of the first inter-stage matching unit and is coupled between the second end of the fifth transistor and the second end of the sixth transistor; the secondary side of the third transformer serves as the output end of the first inter-stage matching unit and is coupled between the control end of the first transistor and the control end of the second transistor.

10. The millimeter wave low noise amplifier according to claim 9, It is characterized in that The output matching unit includes a fourth transformer, the primary side of the fourth transformer serves as the input end of the output matching unit and is coupled to the second end of the third transistor and the second end of the fourth transistor; the secondary side of the fourth transformer serves as the output end of the output matching unit to output the eighth RF signal.

11. The millimeter wave low noise amplifier according to claim 10, It is characterized in that The third transformer and the fourth transformer both include double-coil transformers, and the second transformer and the third transformer both are low-coupling transformers.

12. An electronic circuit, It is characterized in that A millimeter wave low noise amplifier comprising the method described in any one of claims 1 to 11.

13. An electronic device, It is characterized in that Comprising the electronic circuit of claim 12.

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