KR20200112061A - Wideband low noise amplifier - Google Patents

Abstract

Disclosed is a wideband low noise amplifier. According to one embodiment of the present invention, the wideband low noise amplifier includes: a first amplifier comprising a first amplifier circuit having a first frequency characteristic, and a second amplifier circuit connected to a rear end of the first amplifier circuit and having a second frequency characteristic different from the first frequency characteristic; a second amplifier connected to a third amplifier circuit having the second frequency characteristic and a rear end of the third amplifier circuit and including a fourth amplifier circuit having the first frequency characteristic; and a summing unit for summing an output signal of the first amplifier and an output signal of the second amplifier. The present invention can improve noise characteristics in a high frequency band.

Description

Wideband low noise amplifier {WIDEBAND LOW NOISE AMPLIFIER}

The disclosed embodiments relate to a technique for improving noise characteristics of a broadband amplifier applicable to broadcast and wireless communication systems.

In communication standards that use a lot of frequency bands, a broadband amplifier circuit is essentially used. In particular, a receiver of a wired/wireless communication system using a wideband frequency needs to operate stably in a wide frequency band. However, the conventional broadband amplifier circuit capable of operating in a wide frequency band has a disadvantage in that the noise characteristic is inferior to that of the narrowband amplifier circuit because a negative feedback structure and a common gate structure are used. In particular, when a conventional broadband amplifier circuit is used in a broadband wireless communication receiver using a millimeter wave frequency band, noise characteristics due to the operating frequency limit of the transistor are inevitably deteriorated.

Accordingly, there is a need for a wideband amplifying circuit capable of improving noise characteristics in a high frequency band.

Korean Patent Registration No. 10-1038338 (2011.06.08. Announcement)

Disclosed embodiments are to provide a broadband low noise amplifier capable of improving noise characteristics in a high frequency band.

The broadband low-noise amplifier according to an embodiment includes a first amplifying circuit having a first frequency characteristic, and a second amplifying circuit connected to a rear end of the first amplifying circuit and having a second frequency characteristic different from the first frequency characteristic. A first amplification unit comprising a; A second amplifying unit connected to a rear end of the third amplifying circuit having the second frequency characteristic and the third amplifying circuit, and including a fourth amplifying circuit having the first frequency characteristic; And a summing unit for summing the output signal of the first amplifier and the output signal of the second amplifier.

The first amplifying unit may further include a first mixing circuit connected to a rear end of the second amplifying circuit, and the second amplifying unit may further include a second mixing circuit connected to a rear end of the fourth amplifying circuit. have.

The summing unit may add up the output signal of the first mixing circuit and the output signal of the second mixing circuit.

The summing unit may include a broadband amplifier circuit, and may add the output signal of the first amplifier and the output signal of the second amplifier based on the broadband amplifier circuit.

A broadband low-noise amplifier according to another embodiment includes a plurality of amplification units having different frequency bands and including a plurality of amplifying circuits connected in series; And a summation unit for summing the output signals of each of the plurality of amplification units, wherein the serial connection order of the plurality of amplification circuits included in each of the plurality of amplification units is different from that of other amplification units in the plurality of amplification units. Is composed.

According to the disclosed embodiments, noise characteristics in a high frequency band may be improved by amplifying a signal based on a plurality of amplifiers having different frequency bands and including a plurality of amplifier circuits connected in series.

1 is a configuration diagram of a broadband low-noise amplifier according to an embodiment
2 is a diagram illustrating frequency characteristics of a conventional broadband amplifier according to an embodiment
3 is a diagram illustrating frequency characteristics of a broadband low-noise amplifier according to an embodiment
4 is a block diagram of a broadband low-noise amplifier according to an additional embodiment
5 is a configuration diagram of a broadband receiver front end according to an embodiment
6 is a block diagram of a broadband low-noise amplifier according to another embodiment
7 is a diagram illustrating frequency characteristics of a broadband low-noise amplifier according to another embodiment

Hereinafter, a specific embodiment will be described with reference to the drawings. The following detailed description is provided to aid in a comprehensive understanding of the methods, devices, and/or systems described herein. However, this is only an example and is not limited thereto.

In describing the embodiments, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification. The terms used in the detailed description are only for describing the embodiments, and should not be limiting. Unless explicitly used otherwise, expressions in the singular form include the meaning of the plural form. In addition, expressions such as "comprising" or "feature" are intended to indicate certain characteristics, numbers, steps, actions, elements, some or combination thereof, and one or more other characteristics other than those described. It should not be construed to exclude the presence or possibility of, numbers, steps, actions, elements, any part or combination thereof.

1 is a block diagram of a broadband low-noise amplifier 100 according to an embodiment. As shown, the broadband low-noise amplifier 100 according to an embodiment includes a first amplifier 110, a second amplifier 130, and a summing unit 150.

The first amplifier 110 is connected to a first amplifier circuit 111 having a first frequency characteristic and a rear end of the first amplifier circuit 111, and a second amplifier having a second frequency characteristic different from the first frequency characteristic. It includes an amplifying circuit 113.

In one embodiment, the first amplifying circuit 111 and the second amplifying circuit 113 may be connected in series (cascade structure). In one embodiment, when the first amplifier 110 receives an input signal, the first amplifier circuit 111 may amplify the input signal based on the first frequency characteristic. Thereafter, the second amplifying circuit 113 connected to the rear end of the first amplifying circuit 111 may amplify the output signal of the first amplifying circuit 111 based on the second frequency characteristic. In this case, the signal amplified by the first amplifying circuit 111 and the second amplifying circuit 113 connected in series may be determined as an output signal of the first amplifying unit 110.

The second amplifier 130 may include a third amplifier circuit 131 having a second frequency characteristic, and a fourth amplifier circuit 133 connected to a rear end of the third amplifier circuit, and having a first frequency characteristic. have.

In one embodiment, the third amplifying circuit 131 and the fourth amplifying circuit 133 may also be connected in series (cascade structure) like the first amplifying circuit 111 and the second amplifying circuit 113. . In an embodiment, when the second amplifier 130 receives an input signal, the third amplifying circuit 131 may amplify the input signal based on the second frequency characteristic. Thereafter, the fourth amplifying circuit 133 connected to the rear end of the third amplifying circuit 131 may amplify the output signal of the third amplifying circuit 131 based on the first frequency characteristic. In this case, the signal amplified by the third amplifying circuit 131 and the fourth amplifying circuit 133 connected in series may be determined as an output signal of the second amplifying unit 130. In other words, the second amplifying unit 130 is composed of an amplifying circuit having the same frequency characteristics as the first amplifying unit 110, but the connection order may be configured in the opposite direction to that of the first amplifying unit 110.

The first amplifying unit 110 and the second amplifying unit 130 are connected in parallel. That is, the frequency characteristics of the input signals received by the first amplifying unit 110 and the second amplifying unit 130 may be the same.

In one embodiment, the first amplifying circuit 111, the second amplifying circuit 113, the third amplifying circuit 131, and the fourth amplifying circuit 133 may each be configured as a narrowband amplifier. The first amplifying circuit 111, the second amplifying circuit 113, the third amplifying circuit 131, and the fourth amplifying circuit 133 may amplify signals based on their respective frequency characteristics. For example, the first amplifying circuit 111 and the fourth amplifying circuit 113 may amplify a first frequency band of an input signal based on a first frequency characteristic. Also, the second amplifying circuit 113 and the third amplifying circuit 131 may amplify the second frequency band of the input signal based on the second frequency characteristic.

The summing unit 150 sums the output signal of the first amplifier 110 and the output signal of the second amplifier 130. For example, the summing unit 150 may add and output the output signals of each of the first and second amplifying units 110 and 130 connected in parallel.

In this case, the summing unit 150 may be composed of a passive element such as a transformer or a power combiner, or an active element such as a broadband amplifier or a source follower.

~

주파수 대역에서 신호를 증폭할 수 있다. 종래의 광대역 증폭기는 넓은 주파수 대역에서 신호를 증폭할 수 있으나, 상술한 바와 같이 잡음 특성이 나쁘다는 문제점이 있다. 2 is a diagram illustrating frequency characteristics of a conventional broadband amplifier according to an embodiment. As shown in Figure 2, the conventional broadband amplifier

~

Signals can be amplified in the frequency band. Conventional broadband amplifiers can amplify signals in a wide frequency band, but as described above, there is a problem in that noise characteristics are bad.

~

주파수 대역에서 신호를 증폭하고, 제2 주파수 특성(330)을 가지는 제2 증폭 회로(113) 및 제3 증폭 회로(131)는

~

주파수 대역에서 신호를 증폭할 수 있다. 즉, 일 실시예에 따른 광대역 저잡음 증폭기(100)에서 각각의 증폭 회로들은 종래의 광대역 증폭기보다는 좁은 증폭 대역을 가지며, 각각의 증폭 회로들의 출력을 결합함으로써 광대역 증폭기로 기능할 수 있게 된다.3 is a diagram illustrating frequency characteristics of the broadband low noise amplifier 100 according to an embodiment. In this case, the frequency characteristic shown in FIG. 3 may be an example of the frequency characteristic of the broadband low noise amplifier 100 shown in FIG. 1. As shown in FIG. 3, the first amplifying circuit 111 and the fourth amplifying circuit 133 having a first frequency characteristic 310 are

~

The second amplifying circuit 113 and the third amplifying circuit 131 amplifying a signal in a frequency band and having a second frequency characteristic 330 are

~

Signals can be amplified in the frequency band. That is, in the broadband low-noise amplifier 100 according to an embodiment, each amplifying circuit has a narrower amplification band than a conventional broadband amplifier, and can function as a broadband amplifier by combining the outputs of the respective amplifying circuits.

~

주파수 대역에서 신호를 증폭할 수 있다. Since the first amplifier 110 includes a first amplifier circuit 111 and a second amplifier circuit 113 connected in series, the frequency characteristic of the first amplifier 110 is the first amplifier circuit 111. The first frequency characteristic 310 and the second frequency characteristic 320 of the second amplifying circuit 113 may be combined. In this case, the first amplifier 110 is based on the first amplifying circuit 111 and the second amplifying circuit 113 connected in series.

~

Signals can be amplified in the frequency band.

~

주파수 대역에서 신호를 증폭할 수 있다. Since the second amplifying unit 130 includes a third amplifying circuit 131 and a fourth amplifying circuit 133 connected in series, the frequency characteristic of the second amplifying unit 130 is the third amplifier circuit 131. The second frequency characteristic 320 and the first frequency characteristic 310 of the fourth amplifying circuit 133 may be combined. In this case, the second amplifier 130 is based on the third amplifying circuit 131 and the fourth amplifying circuit 133 connected in series.

~

Signals can be amplified in the frequency band.

Accordingly, the broadband low-noise amplifier 100 according to an embodiment can amplify an input signal in a wide frequency band based on the first amplifying unit 110 and the second amplifying unit 130 including an amplifying circuit connected in series. have.

~

주파수 대역에서 입력 신호를 증폭한 후

~

주파수 대역에서 입력 신호를 증폭할 수 있다. 이와 달리 제2 증폭부(130)는 제3 증폭 회로(131) 및 제4 증폭 회로(133)의 연결 순서에 기초하여

~

주파수 대역에서 입력 신호를 증폭한 후

~

주파수 대역에서 입력 신호를 증폭할 수 있다. 즉, 제1 증폭부(110) 및 제2 증폭부(130)는 각각 전단에서 입력 신호를 증폭하는 주파수 대역이 서로 상이하게 구성된다.In addition, the first amplifier 110 is based on the connection order of the first amplifying circuit 111 and the second amplifying circuit 113

~

After amplifying the input signal in the frequency band

~

The input signal can be amplified in the frequency band. Unlike this, the second amplifier 130 is based on the connection order of the third amplifying circuit 131 and the fourth amplifying circuit 133

~

After amplifying the input signal in the frequency band

~

The input signal can be amplified in the frequency band. That is, the first amplifying unit 110 and the second amplifying unit 130 are configured to have different frequency bands for amplifying the input signal at the front end.

~

)에서의 잡음 특성은 저 잡음 특성을 가지나, 후단에 위치한 제2 증폭 회로(113)의 증폭 대역(

~

)의 경우 제1 증폭 회로(111)에서 제대로 증폭이 되지 않기 때문에 상대적으로 잡음 특성이 저하된다. 반대로, 제2 증폭부(130)의 경우, 전단에 위치한 제3 증폭 회로(131)의 증폭 대역(

~

)에서의 잡음 특성은 저 잡음 특성을 가지나, 후단에 위치한 제4 증폭 회로(133)의 증폭 대역(

~

)의 경우 제3 증폭 회로(131)에서 제대로 증폭이 되지 않기 때문에 상대적으로 잡음 특성이 저하된다.Specifically, in the case of the first amplifier 110, the amplification band of the first amplifying circuit 111 located at the front end (

~

The noise characteristic in) has a low noise characteristic, but the amplification band of the second amplifying circuit 113 located at the rear end (

~

In the case of ), since the first amplifying circuit 111 is not properly amplified, the noise characteristic is relatively degraded. Conversely, in the case of the second amplifier 130, the amplification band of the third amplifying circuit 131 located at the front end (

~

The noise characteristic in) has a low noise characteristic, but the amplification band of the fourth amplifying circuit 133 located at the rear end (

~

In the case of ), since the third amplifying circuit 131 is not properly amplified, the noise characteristic is relatively degraded.

That is, the broadband low-noise amplifier 100 according to an embodiment of the present invention has a different order of connection of the amplifying circuits for each amplifying unit, and the first amplifying unit 110 and the second amplifying unit 130 connected in parallel. It is possible to improve the noise characteristics of the wideband amplifier circuit by summing the output signals.

4 is a block diagram of a broadband low noise amplifier 400 according to an additional embodiment. As illustrated, in an embodiment, the first amplifying unit 110 may further include a first mixing circuit 410 connected to a rear end of the second amplifying circuit 113. In addition, the second amplifying unit 130 may further include a second mixing circuit 430 connected to a rear end of the fourth amplifying circuit 133.

In this case, the first mixing circuit 410 may convert the output signal of the second amplifying circuit 113 from high frequency to low frequency. Also, the second mixing circuit 430 may convert the output signal of the fourth amplifying circuit 133 from high frequency to low frequency.

In an embodiment, the summing unit 150 may add the output signal of the first mixing circuit 410 and the output signal of the second mixing circuit 430. For example, the summing unit 150 is the output of each of the first amplifying unit 110 and the second amplifying unit 130 converted to a low frequency lowered by the first mixing circuit 410 and the second mixing circuit 430 Signals can be summed and output.

Accordingly, the first mixing circuit 410 and the second mixing circuit 430 convert the output signals of the first amplifying unit 110 and the second amplifying unit 130 into a low frequency, so that the summing unit 150 performs the first The output signal of the amplifying unit 110 and the output signal of the second amplifying unit 130 can be easily summed.

5 is a configuration diagram of a broadband receiver front-end 500 according to an embodiment. As shown, the broadband receiver front end 500 according to an embodiment includes an antenna 510, a broadband pass filter 530, a broadband low noise amplifier 100, and a broadband amplifier circuit 550.

The broadband receiver front end 500 may receive a signal using the antenna 510 and pass a signal present at a specific frequency among the signals received by the antenna 510 using the broadband pass filter 530. . Thereafter, the broadband receiver front end 500 may amplify the signal passing through the broadband pass filter 530 using the broadband low noise amplifier 100 and the broadband amplifier circuit 550.

As described above, the wideband receiver front end 500 amplifies a signal received through the antenna 510 through the wideband low-noise amplifier 100 with improved noise characteristics, thereby stably operating in a wide frequency band.

Meanwhile, the broadband receiver front end 500 is limited to including the broadband low noise amplifier shown in FIG. 1 in one configuration, but is not necessarily limited thereto, and instead of the broadband low noise amplifier 100 shown in FIG. The broadband low-noise amplifier 400 of FIG. 4 or the broadband low-noise amplifier 600 of FIG. 6 to be described later may be included in one configuration.

6 is a block diagram of a broadband low-noise amplifier 600 according to another embodiment. As shown, the broadband low-noise amplifier 600 according to another embodiment includes a plurality of amplification units 610, 630, and 650 and an summing unit 150.

The plurality of amplification units 610, 630, and 650 have different frequency bands and include a plurality of amplifier circuits connected in series (cascade structure). In addition, an order of serial connection of the plurality of amplifying circuits included in each of the plurality of amplifying units 610, 630, and 650 is configured to be different from that of other amplifying units in the plurality of amplifying units 610, 630, and 650. In this case, each of the plurality of amplifying circuits may be implemented as a narrowband amplifier.

In an embodiment, the plurality of amplification units 610, 630, 650 may include a first amplification unit 610, a second amplification unit 630, and a third amplification unit 650. The first amplifier 610 may include a first amplifier circuit 611, a second amplifier circuit 613, and a third amplifier circuit 615 connected in series. Further, the second amplifying unit 630 may include a fourth amplifying circuit 631, a fifth amplifying circuit 633, and a sixth amplifying circuit 635 connected in series. In addition, the third amplifier 650 may include a seventh amplifier circuit 651, an eighth amplifier circuit 653, and a ninth amplifier circuit 655 connected in series.

In an embodiment, a series connection order of a plurality of amplifying circuits included in the first amplifying unit 610, the second amplifying unit 630, and the third amplifying unit 650 may be configured to be different from each other. For example, the first amplifier 610 is connected to the rear end of the first amplifier circuit 611 and the first amplifier circuit 611 having a first frequency characteristic, and a second amplifier circuit having a second frequency characteristic ( 613), and a third amplifying circuit 615 connected to a rear end of the second amplifying circuit 613 and having a third frequency characteristic. In addition, the second amplifier 630 is connected to the rear end of the fourth amplifying circuit 631 and the fourth amplifying circuit 631 having a second frequency characteristic, and a fifth amplifying circuit 633 having a third frequency characteristic , And a sixth amplifying circuit 635 connected to the rear end of the fifth amplifying circuit 633 and having a first frequency characteristic. In addition, the third amplifier 650 is connected to the rear end of the seventh amplifier circuit 651 and the seventh amplifier circuit 651 having the third frequency characteristic, and the eighth amplifier circuit 653 having the first frequency characteristic , And a ninth amplifying circuit 655 connected to the rear end of the eighth amplifying circuit 653 and having a second frequency characteristic. In other words, the plurality of amplification units 610, 630, and 650 are each composed of a plurality of amplification circuits having the same frequency characteristics as other amplification units in the plurality of amplification units 610, 630, 650, and the connection order is plural. It may be configured to be different from other amplification units in the amplification units 610, 630, and 650 of the.

A plurality of amplification units 610, 630, and 650 are connected in parallel. That is, the frequency characteristics of the input signals received by the first amplifying unit 610, the second amplifying unit 630, and the third amplifying unit 650 may be the same. In this case, the plurality of amplifiers 610, 630, and 650 may amplify the input signal based on the plurality of amplifier circuits. For example, a plurality of amplifying circuits included in the plurality of amplifying units 610, 630, and 650 may each receive and amplify an output signal of an amplifying circuit connected to the front end. In a specific example, when the first amplifier 610 receives an input signal, the first amplifier circuit 611 may amplify the input signal. Thereafter, the second amplifying circuit 613 may receive and amplify the output signal of the first amplifying circuit 611. Thereafter, the third amplifying circuit 615 may receive and amplify the output signal of the second amplifying circuit 613. In addition, the second amplifying unit 630 and the third amplifying unit 650 each amplify the input signal in the same manner as the input signal amplification method of the first amplifying unit 610 described above based on the connection order of a plurality of amplifying circuits. can do.

The summing unit 150 sums the output signals of each of the amplification units 610, 630, and 650. For example, the summing unit 150 may sum and output the output signals of each of the first amplifying unit 610, the second amplifying unit 630, and the third amplifying unit 650 connected in parallel.

In one embodiment, each of the amplification units 610, 630, and 650 may include a mixing circuit. In this case, the summing unit 150 may add up the output signals of each mixing circuit included in the plurality of amplification units 610, 630, and 650. In addition, in an embodiment, the summing unit 150 may include a broadband amplifying circuit. In this case, the summing unit 150 may add up the output signals of the plurality of amplifying units 610, 630, and 650 based on the broadband amplifier circuit.

Meanwhile, in the example shown in FIG. 6, it has been illustrated that the plurality of amplification units 610, 630, and 650 include a first amplification unit 610, a second amplification unit 630, and a third amplification unit 650. , It is not necessarily limited thereto, and the number of the plurality of amplification units may be variously set. In addition, unlike the example shown in FIG. 6, the number of the plurality of amplifying circuits included in the plurality of amplifying units may be variously set based on the number of the plurality of amplifying units, and the serial connection order of the plurality of amplifying circuits It can be set in various ways based on the number of amplifying circuits.

7 is a diagram illustrating frequency characteristics of a wideband low noise amplifier 600 according to another embodiment. In this case, the frequency characteristic shown in FIG. 7 may be an example of the frequency characteristic of the broadband low noise amplifier 600 shown in FIG. 6.

~

주파수 대역에서 신호를 증폭하고, 제2 주파수 특성(720)을 가지는 제2 증폭 회로(613), 제4 증폭 회로(631) 및 제9 증폭 회로(655)는

~

주파수 대역에서 신호를 증폭하고, 제3 주파수 특성(730)을 가지는 제3 증폭 회로(615), 제5 증폭 회로(633) 및 제7 증폭 회로(651)는

~

주파수 대역에서 신호를 증폭할 수 있다. 즉, 다른 실시예에 따른 광대역 저잡음 증폭기(600)에서 각각의 증폭 회로들은 종래의 광대역 증폭기보다는 좁은 증폭 대역을 가지며, 각각의 증폭 회로들의 출력을 결합함으로써 광대역 증폭기로 기능할 수 있게 된다.Referring to FIG. 7, a first amplifier circuit 611 having a first frequency characteristic 710, a sixth amplifier circuit 635, and an eighth amplifier circuit 653 are

~

Amplifying the signal in the frequency band, the second amplifying circuit 613, the fourth amplifying circuit 631 and the ninth amplifying circuit 655 having a second frequency characteristic 720

~

The third amplifying circuit 615, the fifth amplifying circuit 633, and the seventh amplifying circuit 651 amplifying a signal in a frequency band and having a third frequency characteristic 730 are

~

Signals can be amplified in the frequency band. That is, in the broadband low-noise amplifier 600 according to another embodiment, each amplification circuit has a narrower amplification band than a conventional broadband amplifier, and can function as a broadband amplifier by combining the outputs of the respective amplification circuits.

~

사이의 주파수 대역에서 신호를 증폭할 수 있다.The frequency characteristics of the first amplifier 610 are the first frequency characteristics 710 of the first amplifier circuit 611, the second frequency characteristics 720 of the second amplifier circuit 613, and the third amplifier circuit 615. The third frequency characteristic 730 of may be combined. In this case, the first amplifier 610 is based on the first amplifier circuit 611, the second amplifier circuit 613, and the third amplifier circuit 615 connected in series.

~

It can amplify the signal in the frequency band between.

~

사이의 주파수 대역에서 신호를 증폭할 수 있다.The frequency characteristics of the second amplifier 730 are the second frequency characteristics 720 of the fourth amplifier circuit 631, the third frequency characteristics 730 of the fifth amplifier circuit 633, and the sixth amplifier circuit 635 The first frequency characteristic 710 of may be combined. In this case, the second amplifying unit 630 is based on the fourth amplifying circuit 631, the fifth amplifying circuit 633, and the sixth amplifying circuit 635 connected in series.

~

It can amplify the signal in the frequency band between.

~

사이의 주파수 대역에서 신호를 증폭할 수 있다.The frequency characteristics of the third amplifier 650 are the third frequency characteristics 730 of the seventh amplifier circuit 651, the first frequency characteristics 710 of the eighth amplifier circuit 653, and the ninth amplifier circuit 655 The second frequency characteristic 720 of may be combined. In this case, the third amplifier 650 is based on the seventh amplifier circuit 651, the eighth amplifier circuit 653, and the ninth amplifier circuit 655 connected in series.

~

It can amplify the signal in the frequency band between.

Accordingly, the broadband low-noise amplifier 600 according to another embodiment is input in a wide frequency band based on the first amplifier 610, the second amplifier 630, and the third amplifier including an amplifier circuit connected in series. You can amplify the signal.

~

주파수 대역에서 입력 신호를 증폭한 후

~

및

~

주파수 대역에서 입력 신호를 증폭할 수 있다. In addition, the first amplifier 610 is based on the connection order of the first amplifier circuit 611, the second amplifier circuit 613, and the third amplifier circuit 615

~

After amplifying the input signal in the frequency band

~

And

~

The input signal can be amplified in the frequency band.

~

주파수 대역에서 입력 신호를 증폭한 후

~

및

~

주파수 대역에서 입력 신호를 증폭할 수 있다.The second amplifier 630 is based on the connection order of the fourth amplifier circuit 631, the fifth amplifier circuit 633, and the sixth amplifier circuit 635

~

After amplifying the input signal in the frequency band

~

And

~

The input signal can be amplified in the frequency band.

~

주파수 대역에서 입력 신호를 증폭한 후

~

및

~

주파수 대역에서 입력 신호를 증폭할 수 있다.The second amplifier 650 is based on the connection order of the seventh amplifier circuit 651, the eighth amplifier circuit 653, and the ninth amplifier circuit 655

~

After amplifying the input signal in the frequency band

~

And

~

The input signal can be amplified in the frequency band.

That is, the first amplifying unit 610, the second amplifying unit 630, and the third amplifying unit 650 are configured to have different frequency bands for amplifying the input signal at the front end.

~

)에서의 잡음 특성은 저 잡음 특성을 가지나, 후단에 위치한 제2 증폭 회로(613)의 증폭 대역(

~

) 및 제3 증폭 회로(615)의 증폭 대역(

~

)의 경우 제1 증폭 회로(611)에서 제대로 증폭이 되지 않기 때문에 상대적으로 잡음 특성이 저하된다. 반대로, 제2 증폭부(630)의 경우, 전단에 위치한 제4 증폭 회로(631)의 증폭 대역(

~

)에서의 잡음 특성은 저 잡음 특성을 가지나, 후단에 위치한 제5 증폭 회로(633)의 증폭 대역(

~

) 및 제6 증폭 회로(635)의 증폭 대역(

~

)의 경우 제4 증폭 회로(631)에서 제대로 증폭이 되지 않기 때문에 상대적으로 잡음 특성이 저하된다. 반대로, 제3 증폭부(650)의 경우, 전단에 위치한 제7 증폭 회로(651)의 증폭 대역(

~

)에서의 잡음 특성은 저 잡음 특성을 가지나, 후단에 위치한 제8 증폭 회로(653)의 증폭 대역(

~

) 및 제9 증폭 회로(655)의 증폭 대역(

~

)의 경우 제7 증폭 회로(651)에서 제대로 증폭이 되지 않기 때문에 상대적으로 잡음 특성이 저하된다.Specifically, in the case of the first amplifier 610, the amplification band of the first amplifying circuit 611 located at the front end (

~

The noise characteristic in) has a low noise characteristic, but the amplification band of the second amplifying circuit 613 located at the rear end (

~

) And the amplification band of the third amplifying circuit 615 (

~

In the case of ), since the first amplification circuit 611 is not properly amplified, noise characteristics are relatively degraded. Conversely, in the case of the second amplifier 630, the amplification band of the fourth amplifying circuit 631 located at the front end (

~

The noise characteristic in) has a low noise characteristic, but the amplification band of the fifth amplifying circuit 633 located at the rear end (

~

) And an amplification band of the sixth amplifier circuit 635 (

~

In the case of ), since the fourth amplifying circuit 631 is not properly amplified, the noise characteristic is relatively degraded. Conversely, in the case of the third amplifier 650, the amplification band of the seventh amplifying circuit 651 located at the front end (

~

The noise characteristic in) has a low noise characteristic, but the amplification band of the 8th amplifier circuit 653 located at the rear end (

~

) And an amplification band of the ninth amplifier circuit 655 (

~

In the case of ), since the seventh amplifying circuit 651 is not properly amplified, the noise characteristic is relatively lowered.

That is, the broadband low-noise amplifier 600 according to another embodiment of the present invention has a different connection order of the amplifier circuits for each amplifier unit, and the first amplifier 610 and the second amplifier 630 connected in parallel. And by summing the output signals of the third amplifier 650, it is possible to improve noise characteristics of the broadband amplifier circuit.

In the above, technical features have been described based on the embodiments. However, the disclosed embodiments should be considered from an explanatory point of view rather than a limiting point of view, and the scope of the rights is indicated in the claims rather than the above description, and all differences within the scope of the same are interpreted as being included in the scope of rights. Should be.

100, 400, 600: wideband low noise amplifier
110, 610: first amplification unit
130, 630: second amplification unit
650: third amplification unit
111, 611: first amplifier circuit
113, 613: second amplifier circuit
131, 615: third amplifier circuit
135, 631: fourth amplifier circuit
633: fifth amplifier circuit
635: sixth amplifier circuit
651: seventh amplifier circuit
653: eighth amplifier circuit
655: ninth amplifier circuit
150: summing section
410: first mixing circuit
430: second mixing circuit
500: broadband receiver front end
510: antenna
530: broadband pass filter
550: broadband amplifier circuit

Claims (5)

A first amplifier comprising a first amplifier circuit having a first frequency characteristic and a second amplifier circuit connected to a rear end of the first amplifier circuit and having a second frequency characteristic different from the first frequency characteristic;
A second amplifying unit connected to a rear end of the third amplifying circuit having the second frequency characteristic and the third amplifying circuit, and including a fourth amplifying circuit having the first frequency characteristic; And
And a summing unit for summing the output signal of the first amplifier and the output signal of the second amplifier.
The method according to claim 1,
The first amplifier further includes a first mixing circuit connected to a rear end of the second amplifier circuit,
The second amplifying unit further comprises a second mixing circuit connected to a rear end of the fourth amplifying circuit.
The method according to claim 2,
The summing unit adds up the output signal of the first mixing circuit and the output signal of the second mixing circuit.
The method according to claim 1,
The summing unit includes a broadband amplifying circuit, and based on the broadband amplifying circuit, the broadband low-noise amplifier summing the output signal of the first amplifier and the output signal of the second amplifier.
A plurality of amplifiers having different frequency bands and including a plurality of amplifier circuits connected in series; And
And a summing unit for summing the output signals of each of the plurality of amplification units,
A broadband low-noise amplifier configured such that a series connection order of the plurality of amplifying circuits included in each of the plurality of amplifying units is different from that of other amplifying units in the plurality of amplifying units.

Images