CN207382273U - A Numerically Controlled Attenuator with High Heat Dissipation Performance - Google Patents

Abstract

The utility model discloses a kind of numerical-control attenuators with high heat dispersion, include the attenuation module of N number of series connection, input terminal of the input terminal of first attenuation module as numerical-control attenuator, output terminal of the output terminal of the last one attenuation module as numerical-control attenuator, N number of attenuation module annular array；Each attenuation module controls attenuation by the control signal of input to respective control terminal, wherein：N is the integer more than 1.Compared with the attenuation module that numerical-control attenuator in the prior art includes is arranged in a straight line, the attenuation module included in the numerical-control attenuator that the application provides is together in series according to annular array mode.The application is decayed by the control terminal of input control signal to attenuation module so as to control.The attenuation module chip occupying area of annular array is smaller, and it is uniform to radiate, and so as to improve the heat dissipation performance of numerical-control attenuator, extends the service life of numerical-control attenuator.

Description

A Numerically Controlled Attenuator with High Heat Dissipation Performance

technical field

The utility model relates to the technical field of signal attenuation, in particular to a numerically controlled attenuator with high heat dissipation performance.

Background technique

With the development of communication technology, the application of communication system is more and more extensive. A communication system usually includes a transmitter and a receiver. When the distance between the two is different, the amplitude of the signal received by the receiver will also change accordingly, and the range of variation generally ranges from tens of millivolts to hundreds of millivolts. In order to prevent the internal signal channel of the receiver from being blocked by relatively large-amplitude signals, it is necessary to add corresponding control modules to control the signal amplitude. Because the digital control attenuator has the advantages of low power consumption, high linearity and wide operating bandwidth, it is usually used as a control module for controlling the signal amplitude. Please refer to FIG. 1 , which is a schematic structural diagram of a digitally controlled attenuator in the prior art. In the prior art, a numerically controlled attenuator is composed of a plurality of attenuating modules arranged in series in a straight line. However, the attenuating modules arranged in a straight line occupy a large chip area and have uneven heat dissipation, thereby reducing the heat dissipation performance of the numerically controlled attenuator and shortening the time required for the numerically controlled attenuator. life of the attenuator.

Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present.

Utility model content

The purpose of this utility model is to provide a numerically controlled attenuator with high heat dissipation performance. The attenuation modules arranged in a ring occupy a small chip area and have uniform heat dissipation, thereby improving the heat dissipation performance of the numerically controlled attenuator and prolonging the use of the numerically controlled attenuator. life.

In order to solve the above technical problems, the utility model provides a numerically controlled attenuator with high heat dissipation performance, including N attenuating modules in series, the input end of the first attenuating module is used as the input end of the numerically controlled attenuator, and the last one The output end of the attenuation module is used as the output end of the numerically controlled attenuator, and the N attenuation modules are arranged in a ring; each of the attenuation modules is controlled by a control signal input to a respective control end, wherein: N is greater than 1 integer.

Preferably, the control terminal includes a main control terminal and a complementary control terminal, the voltage signals input by the main control terminal and the complementary control terminal are complementary, and each of the M attenuation modules includes a first resistor module, a second resistor module, and a second resistor module. module, the third resistance module, the first controllable switch and the second controllable switch, M<N, wherein:

The first end of the first resistance module is respectively connected to the first end of the second resistance module and the first end of the first controllable switch, and its common end is used as the input end of the attenuation module where it is located. The second end of a resistance module is respectively connected to the first end of the third resistance module and the second end of the first controllable switch, and its common end is used as the output end of the attenuation module where the first controllable switch is located. The control terminal of the switch is used as the main control terminal of the attenuation module, and the second terminal of the second resistance module is respectively connected with the second terminal of the third resistance module and the first terminal of the second controllable switch, so The second terminal of the second controllable switch is grounded, and the control terminal of the second controllable switch serves as the complementary control terminal of the attenuation module where it is located.

Preferably, the M attenuation modules also include a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, wherein:

The first terminal of the first voltage dividing resistor is connected to the control terminal of the first controllable switch, the second terminal of the first voltage dividing resistor serves as the main control terminal of the attenuation module where it is located, and the second voltage dividing resistor The first end of the resistor is connected to the control end of the second controllable switch, the second end of the second voltage dividing resistor is used as the complementary control end of the attenuation module, the first end of the third voltage dividing resistor is connected to the The second end of the second controllable switch is connected, and the second end of the third voltage dividing resistor is grounded.

Preferably, each of the N-M attenuation modules includes a fourth resistance module, a third controllable switch, a fourth controllable switch, and a fifth controllable switch having the same structure as the fourth controllable switch, wherein:

The first end of the fourth resistance module is respectively connected to the first end of the third controllable switch and the first end of the fourth controllable switch, and its common end is used as the input end of the attenuation module. The second end of the fourth resistance module is respectively connected to the second end of the third controllable switch and the first end of the fifth controllable switch, and its common end is used as the output end of the attenuation module where the third controllable switch is located. The control end of the controllable switch is used as the main control end of the attenuation module, the second end of the fourth controllable switch is grounded, the second end of the fifth controllable switch is grounded, and the control of the fourth controllable switch The terminal is connected to the control terminal of the fifth controllable switch, and its common terminal is used as the complementary control terminal of the attenuation module.

Preferably, the N-M attenuation modules also include a fourth voltage dividing resistor, a fifth voltage dividing resistor, a sixth voltage dividing resistor, a seventh voltage dividing resistor and an eighth voltage dividing resistor, wherein:

The first terminal of the fourth voltage dividing resistor is connected to the control terminal of the third controllable switch, the second terminal of the fourth voltage dividing resistor is used as the main control terminal of the attenuation module, and the fifth voltage dividing resistor The first end of the resistor is connected to the control end of the fourth controllable switch, the first end of the sixth voltage dividing resistor is connected to the control end of the fifth controllable switch, and the fifth voltage dividing resistor The second terminal is connected to the second terminal of the sixth voltage dividing resistor, and its common terminal is used as the complementary control terminal of the attenuation module, and the first terminal of the seventh voltage dividing resistor is connected to the first terminal of the fourth controllable switch. The two terminals are connected, the second end of the seventh voltage dividing resistor is grounded, the first end of the eighth voltage dividing resistor is connected to the second end of the fifth controllable switch, and the eighth voltage dividing resistor is connected to the second end of the fifth controllable switch. The second end is grounded.

Preferably, the first resistor module, the second resistor module and the third resistor module all include a plurality of resistors whose resistance values are less than a preset resistance value.

Preferably, the fourth resistor module includes a plurality of resistors whose resistance values are less than a preset resistance value.

Preferably, the digitally controlled attenuator further includes an inductance added between the output end and the input end of adjacent attenuation modules, wherein the inductance is an inductance with an inductance value smaller than a preset inductance value.

Preferably, said first controllable switch and/or said second controllable switch and/or said third controllable switch and/or said fourth controllable switch and/or said fifth controllable switch Both are GaAs pHEMT tubes, and the drain of the GaAs pHEMT tube serves as the first controllable switch and/or the second controllable switch and/or the third controllable switch and/or the fourth controllable switch controllable switch and/or the first terminal of the fifth controllable switch, the source of the GaAs pHEMT tube is used as the first controllable switch and/or the second controllable switch and/or the third controllable switch The controllable switch and/or the second terminal of the fourth controllable switch and/or the fifth controllable switch, the gate of the GaAs pHEMT tube as the first controllable switch and/or the second controllable switch A control terminal of the second controllable switch and/or the third controllable switch and/or the fourth controllable switch and/or the fifth controllable switch.

The utility model provides a numerically controlled attenuator with high heat dissipation performance, which includes N attenuating modules connected in series, the input end of the first attenuating module is used as the input end of the numerically controlled attenuator, and the output end of the last attenuating module is used as the numerically controlled attenuator At the output terminal of the device, N attenuation modules are arranged in a ring; each attenuation module is controlled by a control signal input to its respective control terminal, wherein: N is an integer greater than 1.

Compared with the linear arrangement of the attenuation modules contained in the digital control attenuator in the prior art, the attenuation modules contained in the digital control attenuator provided by the present application are connected in series in a circular arrangement. In this application, the attenuation is controlled by inputting a control signal to the control terminal of the attenuation module. The ring-arranged attenuation modules occupy a small chip area and have uniform heat dissipation, thereby improving the heat dissipation performance of the numerically controlled attenuator and prolonging the service life of the numerically controlled attenuator.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the prior art and the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of a kind of numerical control attenuator in the prior art;

Fig. 2 is a structural schematic diagram of a numerically controlled attenuator with high heat dissipation performance provided by the utility model;

Fig. 3 is a specific structural schematic diagram of an application of the attenuation module shown in Fig. 2;

FIG. 4 is a schematic structural diagram of another application of the attenuation module shown in FIG. 2 .

Detailed ways

The core of the utility model is to provide a numerically controlled attenuator with high heat dissipation performance. The circularly arranged attenuation modules occupy a small chip area and have uniform heat dissipation, thereby improving the heat dissipation performance of the numerically controlled attenuator and prolonging the use of the numerically controlled attenuator. life.

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of a numerically controlled attenuator with high heat dissipation performance provided by the present invention.

The digital control attenuator includes N attenuation modules 1 in series, the input terminal of the first attenuation module 1 is used as the input terminal of the digital control attenuator, the output terminal of the last attenuation module 1 is used as the output terminal of the digital control attenuator, and the N attenuation modules 1 are arranged in a ring; each attenuation module 1 is controlled by a control signal input to its respective control terminal, wherein: N is an integer greater than 1.

It should be noted that the preset in this application is set in advance and only needs to be set once, unless it needs to be modified according to the actual situation, otherwise it does not need to be modified.

Specifically, a digitally controlled attenuator usually controls its attenuation with a certain attenuation step. Compared with analog attenuators, digitally controlled attenuators have better matching characteristics and higher attenuation accuracy. Compared with fixed attenuators with fixed attenuation values, digitally controlled attenuators can be used in a wider range of applications.

For example, in microwave receivers, the application of numerically controlled attenuators can be reflected in: controlling the output power of the local oscillator by reducing the frequency conversion loss, thereby minimizing the noise figure and achieving a better receiving state. Or applied in the electronic warfare system, the application of the digital control attenuator can be reflected in: when the radar is working normally, only reduce the interference signal to the radar without causing attenuation; when the external interference suddenly becomes stronger, rapidly increase the attenuation and increase Combat survivability of radar on the battlefield.

The digitally controlled attenuator here can be realized by GaAs pHEMT tube technology, which has the advantages of high speed, low loss and small size.

The numerically controlled attenuator in this application includes a plurality of attenuation modules 1 connected in series. The attenuation modules 1 can be arranged in ascending order of attenuation, and then connected in series (cascaded), so as to realize the overall attenuation function. At this time, the input terminal of the attenuation module 1 (the first attenuation module 1) with the smallest attenuation is used as the input terminal of the digital control attenuator, and the output terminal of the attenuation module 1 with the largest attenuation (the last attenuation module 1) is used as the digital control attenuator output terminal. As for the specific arrangement order of the attenuation modules 1 , the present application does not make any special limitation here.

In the process of series connection, as shown in Figure 2, it is connected in series according to a circular arrangement, that is, except for the first attenuation module 1 and the last attenuation module 1, the output terminal of the previous attenuation module 1 is connected to the input of the next attenuation module 1 The ends are connected to form a ring. It should be noted that the circular arrangement is not only arranged in a square as shown in FIG. 2 , but also arranged in a circle or an ellipse, which is not specifically limited in this application.

It can be seen that the present application arranges the attenuation modules 1 in a circular manner, which occupies a small chip area, and makes the devices in the numerically controlled attenuator as evenly distributed as possible in a limited area, so as to ensure uniform heat dissipation and avoid excessive local temperature to achieve better performance. The heat dissipation performance prolongs the service life of the digital control attenuator.

The utility model provides a numerically controlled attenuator with high heat dissipation performance, which includes N attenuating modules connected in series, the input end of the first attenuating module is used as the input end of the numerically controlled attenuator, and the output end of the last attenuating module is used as the numerically controlled attenuator At the output terminal of the device, N attenuation modules are arranged in a ring; each attenuation module is controlled by a control signal input to its respective control terminal, wherein: N is an integer greater than 1.

Compared with the linear arrangement of the attenuation modules contained in the digital control attenuator in the prior art, the attenuation modules contained in the digital control attenuator provided by the present application are connected in series in a circular arrangement. In this application, the attenuation is controlled by inputting a control signal to the control terminal of the attenuation module. The ring-arranged attenuation modules occupy a small chip area and have uniform heat dissipation, thereby improving the heat dissipation performance of the numerically controlled attenuator and prolonging the service life of the numerically controlled attenuator.

On the basis of above-mentioned embodiment:

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of an application of the attenuation module shown in FIG. 2 .

As a preferred embodiment, the control terminal includes a main control terminal and a complementary control terminal, and the voltage signals input by the main control terminal and the complementary control terminal are complementary, and the M attenuation modules 1 each include a first resistance module R1, a second resistance module R2, the third resistance module R3, the first controllable switch M1 and the second controllable switch M2, M<N, wherein:

The first end of the first resistance module R1 is respectively connected to the first end of the second resistance module R2 and the first end of the first controllable switch M1, and its common end is used as the input end of the attenuation module 1 where it is located. The first resistance module R1 The second end of the second end is respectively connected with the first end of the third resistance module R3 and the second end of the first controllable switch M1, and its common end is used as the output end of the attenuation module 1, and the control end of the first controllable switch M1 is used as The main control end of the attenuation module 1 where the second end of the second resistance module R2 is respectively connected to the second end of the third resistance module R3 and the first end of the second controllable switch M2, the second end of the second controllable switch M2 Both terminals are grounded, and the control terminal of the second controllable switch M2 serves as the complementary control terminal of the attenuation module 1 where it is located.

Specifically, as shown in FIG. 3 , the attenuation structure of the attenuation module 1 has excellent port standing wave characteristics and low insertion loss, and is an attenuation structure suitable for small attenuation. The attenuation module 1 is composed of a switch-controlled resistor network, that is, the main control terminal and the complementary control terminal of the attenuation module 1 respectively input complementary voltage signals (the high-potential voltage signal and the low-potential voltage signal are complementary voltage signals). When the main control terminal is connected to a high potential and the complementary control terminal is connected to a low potential, the first controllable switch M1 is turned on, and the second controllable switch M2 is turned off. At this time, the signal input by the attenuation module 1 directly passes through the first controllable switch M1 The conduction path passes through, and the attenuation is 0dB.

Conversely, when the main control terminal is connected to a low potential and the complementary control terminal is connected to a high potential, the first controllable switch M1 is turned off, and the second controllable switch M2 is turned on. At this time, the path that was turned on by the first controllable switch M1 is turned off. , the signal input by the attenuation module 1 flows through the entire attenuation structure to realize attenuation.

Preferably, the resistance of the third resistance module R3 is equal to the resistance of the second resistance module R2, so that the attenuation module 1 can achieve a better port impedance matching effect.

As a preferred embodiment, the M attenuation modules 1 also include a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor, wherein:

The first terminal of the first voltage dividing resistor is connected to the control terminal of the first controllable switch M1, the second terminal of the first voltage dividing resistor is used as the main control terminal of the attenuation module 1, and the first terminal of the second voltage dividing resistor is connected to the control terminal of the first controllable switch M1. The control end of the second controllable switch M2 is connected, the second end of the second voltage dividing resistor is used as the complementary control end of the attenuation module 1, the first end of the third voltage dividing resistor is connected to the second end of the second controllable switch M2 connected, and the second terminal of the third voltage dividing resistor is grounded.

Specifically, in order to protect the first controllable switch M1 and the second controllable switch M2, the attenuation module 1 also adds a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor to play the role of voltage dividing and current limiting. The function further prolongs the service life of the digital control attenuator.

Please refer to FIG. 4 , which is a schematic structural diagram of another application of the attenuation module shown in FIG. 2 .

As a preferred embodiment, the N-M attenuation modules 1 each include a fourth resistance module R4, a third controllable switch M3, a fourth controllable switch M4, and a fifth controllable switch with the same structure as the fourth controllable switch M4 M5, where:

The first end of the fourth resistance module R4 is respectively connected to the first end of the third controllable switch M3 and the first end of the fourth controllable switch M4, and its common end is used as the input end of the attenuation module 1 where it is located. The fourth resistance module The second end of R4 is respectively connected with the second end of the third controllable switch M3 and the first end of the fifth controllable switch M5, and its common end is used as the output end of the attenuation module 1 where it is located, and the control of the third controllable switch M3 terminal as the main control terminal of the attenuation module 1, the second terminal of the fourth controllable switch M4 is grounded, the second terminal of the fifth controllable switch M5 is grounded, the control terminal of the fourth controllable switch M4 is connected to the fifth controllable switch The control terminal of M5 is connected, and its common terminal is used as the complementary control terminal of the attenuation module 1 where it is located.

Specifically, as shown in FIG. 4 , the attenuation structure of the attenuation module 1 has a small size, which is more suitable for high-frequency situations, has small insertion loss, and has better port standing wave performance. The attenuation module 1 is also composed of a switch-controlled resistor network. Similarly, the main control terminal and the complementary control terminal of the attenuation module 1 respectively input complementary voltage signals. When the main control terminal is connected to a high potential and the complementary control terminal is connected to a low potential, the third controllable switch M3 is turned on, and the fourth controllable switch M4 and the fifth controllable switch M5 are both turned off. At this time, the signal input by the attenuation module 1 All pass through the path turned on by the third controllable switch M3, the attenuation network is not actually connected to the signal path, and the entire attenuation module 1 has no attenuation effect.

Conversely, when the main control terminal is connected to a low potential and the complementary control terminal is connected to a high potential, the third controllable switch M3 is turned off, the fourth controllable switch M4 and the fifth controllable switch M5 are both turned on, and all the resistor networks are connected to signal path, thereby achieving attenuation.

As a preferred embodiment, each of the N-M attenuation modules 1 also includes a fourth voltage dividing resistor, a fifth voltage dividing resistor, a sixth voltage dividing resistor, a seventh voltage dividing resistor and an eighth voltage dividing resistor, wherein:

The first terminal of the fourth voltage dividing resistor is connected to the control terminal of the third controllable switch M3, the second terminal of the fourth voltage dividing resistor is used as the main control terminal of the attenuation module 1, and the first terminal of the fifth voltage dividing resistor is connected to the control terminal of the third controllable switch M3. The control end of the fourth controllable switch M4 is connected, the first end of the sixth voltage dividing resistor is connected to the control end of the fifth controllable switch M5, the second end of the fifth voltage dividing resistor is connected to the second end of the sixth voltage dividing resistor The common end is used as the complementary control end of the attenuation module 1, the first end of the seventh voltage dividing resistor is connected to the second end of the fourth controllable switch M4, the second end of the seventh voltage dividing resistor is grounded, and the second end of the seventh voltage dividing resistor is connected to the ground. The first end of the eighth voltage dividing resistor is connected to the second end of the fifth controllable switch M5, and the second end of the eighth voltage dividing resistor is grounded.

Similarly, in order to protect the third controllable switch M3, the fourth controllable switch M4 and the fifth controllable switch M5, the attenuation module 1 also adds a fourth voltage dividing resistor, a fifth voltage dividing resistor, a sixth voltage dividing resistor, The seventh voltage dividing resistor and the eighth voltage dividing resistor play the role of voltage dividing and current limiting, further prolonging the service life of the digital control attenuator.

Preferably, the resistance value of the fifth voltage dividing resistor is equal to the resistance value of the sixth voltage dividing resistor, and the resistance value of the seventh voltage dividing resistor is equal to the resistance value of the eighth voltage dividing resistor, so that the attenuation module 1 can achieve a better Port impedance matching effect.

As a preferred embodiment, the first resistor module R1 , the second resistor module R2 and the third resistor module R3 all include a plurality of resistors whose resistance values are less than a preset resistance value.

Specifically, the first resistor module R1 , the second resistor module R2 and the third resistor module R3 can all be composed of a resistor whose resistance value is greater than a certain value. More preferably, each of the first resistor module R1 , the second resistor module R2 and the third resistor module R3 may include a plurality of resistors whose resistance values are smaller than the preset resistance values. By replacing a larger resistor with multiple smaller resistors, the larger resistor is decomposed, and when a high-power signal is loaded on the input and output of the digital control attenuator, the heat is evenly distributed It is distributed to each resistor with a small resistance value, that is, the dispersion of resistance is also accompanied by the dispersion of heat, which alleviates the thermal effect of a single resistor to a large extent, and avoids damage to the device caused by excessive heat generated by a single device.

In addition, decomposing the resistance actually elongates the individual attenuation modules 1 in the horizontal direction, which is also more conducive to the realization of the circular arrangement of the attenuation modules 1 in series to achieve thermal uniformity.

As a preferred embodiment, the fourth resistor module R4 includes a plurality of resistors whose resistance values are less than a preset resistance value.

Likewise, the fourth resistor module R4 may be composed of a resistor with a resistance greater than a certain value. More preferably, the fourth resistor module R4 may include a plurality of resistors whose resistance values are smaller than the preset resistance values. By replacing one resistor with a larger resistance with multiple resistors with a smaller resistance, the resistors are decomposed to a certain extent, the thermal effect of individual resistors is reduced, and it is beneficial to the overall heat dissipation of the numerically controlled attenuator.

As a preferred embodiment, the digitally controlled attenuator further includes an inductance added between the output end and the input end of adjacent attenuation modules 1 , wherein the inductance is an inductance with an inductance value smaller than a preset inductance value.

Specifically, an inductance value smaller than the set inductance is added between the output and input ends of adjacent attenuation modules 1, that is, between each two-stage attenuation module 1, and the inductance performs resonant compensation for the parasitic capacitance, thereby achieving better performance. The port impedance matching effect.

As a preferred embodiment, the first controllable switch M1 and/or the second controllable switch M2 and/or the third controllable switch M3 and/or the fourth controllable switch M4 and/or the fifth controllable switch M5 Both are GaAs pHEMT tubes, and the drain of the GaAs pHEMT tube is used as the first controllable switch M1 and/or the second controllable switch M2 and/or the third controllable switch M3 and/or the fourth controllable switch M4 and/or the first The first end of five controllable switches M5, the source of the GaAs pHEMT tube is used as the first controllable switch M1 and/or the second controllable switch M2 and/or the third controllable switch M3 and/or the fourth controllable switch M4 And/or the second end of the fifth controllable switch M5, the gate of the GaAspHEMT tube is used as the first controllable switch M1 and/or the second controllable switch M2 and/or the third controllable switch M3 and/or the fourth controllable switch M3 control terminal of the control switch M4 and/or the fifth control switch M5.

Specifically, the first controllable switch M1 and/or the second controllable switch M2 and/or the third controllable switch M3 and/or the fourth controllable switch M4 and/or the fifth controllable switch M5 can be GaAs pHEMT tube. The first controllable switch M1, the second controllable switch M2, the third controllable switch M3, the fourth controllable switch M4 and the fifth controllable switch M5 in this application can also be other switching devices, and this application does not Make a special limit.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A numerically controlled attenuator with high heat dissipation performance is characterized in that it comprises N attenuation modules connected in series, the input end of the first attenuation module is used as the input end of the numerically controlled attenuator, and the output end of the last attenuation module As the output end of the digitally controlled attenuator, N attenuation modules are arranged in a ring; each attenuation module is controlled by a control signal input to a respective control end, wherein: N is an integer greater than 1. 2. The digitally controlled attenuator as claimed in claim 1, wherein the control terminal comprises a main control terminal and a complementary control terminal, and the voltage signals input by the main control terminal and the complementary control terminal are complementary, M The attenuation modules each include a first resistance module, a second resistance module, a third resistance module, a first controllable switch and a second controllable switch, M<N, wherein: The first end of the first resistance module is respectively connected to the first end of the second resistance module and the first end of the first controllable switch, and its common end is used as the input end of the attenuation module where it is located. The second end of a resistance module is respectively connected to the first end of the third resistance module and the second end of the first controllable switch, and its common end is used as the output end of the attenuation module where the first controllable switch is located. The control terminal of the switch is used as the main control terminal of the attenuation module, and the second terminal of the second resistance module is respectively connected with the second terminal of the third resistance module and the first terminal of the second controllable switch, so The second terminal of the second controllable switch is grounded, and the control terminal of the second controllable switch serves as the complementary control terminal of the attenuation module where it is located. 3. The numerically controlled attenuator as claimed in claim 2, is characterized in that, M described attenuation modules also all comprise the first voltage dividing resistor, the second voltage dividing resistor and the 3rd voltage dividing resistor, wherein: The first terminal of the first voltage dividing resistor is connected to the control terminal of the first controllable switch, the second terminal of the first voltage dividing resistor serves as the main control terminal of the attenuation module where it is located, and the second voltage dividing resistor The first end of the resistor is connected to the control end of the second controllable switch, the second end of the second voltage dividing resistor is used as the complementary control end of the attenuation module, the first end of the third voltage dividing resistor is connected to the The second end of the second controllable switch is connected, and the second end of the third voltage dividing resistor is grounded. 4. The numerically controlled attenuator as claimed in claim 2, characterized in that, the N-M attenuation modules all include a fourth resistance module, a third controllable switch, a fourth controllable switch and the fourth controllable switch. The fifth controllable switch with the same structure, wherein: The first end of the fourth resistance module is respectively connected to the first end of the third controllable switch and the first end of the fourth controllable switch, and its common end is used as the input end of the attenuation module. The second end of the fourth resistance module is respectively connected to the second end of the third controllable switch and the first end of the fifth controllable switch, and its common end is used as the output end of the attenuation module where the third controllable switch is located. The control end of the controllable switch is used as the main control end of the attenuation module, the second end of the fourth controllable switch is grounded, the second end of the fifth controllable switch is grounded, and the control of the fourth controllable switch The terminal is connected to the control terminal of the fifth controllable switch, and its common terminal is used as the complementary control terminal of the attenuation module. 5. The numerical control attenuator as claimed in claim 4, is characterized in that, N-M described attenuation modules also all comprise the 4th voltage dividing resistor, the 5th voltage dividing resistor, the 6th voltage dividing resistor, the 7th voltage dividing resistor and The eighth voltage dividing resistor, wherein: The first terminal of the fourth voltage dividing resistor is connected to the control terminal of the third controllable switch, the second terminal of the fourth voltage dividing resistor is used as the main control terminal of the attenuation module, and the fifth voltage dividing resistor The first end of the resistor is connected to the control end of the fourth controllable switch, the first end of the sixth voltage dividing resistor is connected to the control end of the fifth controllable switch, and the fifth voltage dividing resistor The second terminal is connected to the second terminal of the sixth voltage dividing resistor, and its common terminal is used as the complementary control terminal of the attenuation module, and the first terminal of the seventh voltage dividing resistor is connected to the first terminal of the fourth controllable switch. The two terminals are connected, the second end of the seventh voltage dividing resistor is grounded, the first end of the eighth voltage dividing resistor is connected to the second end of the fifth controllable switch, and the eighth voltage dividing resistor is connected to the second end of the fifth controllable switch. The second end is grounded. 6. The numerically controlled attenuator according to any one of claims 2-5, wherein the first resistance module, the second resistance module and the third resistance module all include a plurality of resistance values less than a predetermined Set the value of the resistor. 7. The digitally controlled attenuator according to any one of claims 4-5, wherein the fourth resistor module includes a plurality of resistors whose resistance values are less than a preset resistance value. 8. The numerically controlled attenuator as claimed in claim 7, is characterized in that, this numerically controlled attenuator also comprises the inductance that is added between the output end and the input end of adjacent attenuation module, and wherein, described inductance is that inductance value is less than Inductor with preset inductance value. 9. The digitally controlled attenuator according to claim 8, characterized in that, the first controllable switch and/or the second controllable switch and/or the third controllable switch and/or the first controllable switch The four controllable switches and/or the fifth controllable switch are all GaAspHEMT tubes, and the drain of the GaAs pHEMT tube is used as the first controllable switch and/or the second controllable switch and/or the The first end of the third controllable switch and/or the fourth controllable switch and/or the fifth controllable switch, the source of the GaAspHEMT tube is used as the first controllable switch and/or the first controllable switch and/or the fifth controllable switch. The second end of the second controllable switch and/or the third controllable switch and/or the fourth controllable switch and/or the fifth controllable switch, the gate of the GaAs pHEMT is used as the A control terminal of the first controllable switch and/or the second controllable switch and/or the third controllable switch and/or the fourth controllable switch and/or the fifth controllable switch.