CN212367228U - Low-noise amplifier - Google Patents
Low-noise amplifier Download PDFInfo
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- CN212367228U CN212367228U CN202021145374.XU CN202021145374U CN212367228U CN 212367228 U CN212367228 U CN 212367228U CN 202021145374 U CN202021145374 U CN 202021145374U CN 212367228 U CN212367228 U CN 212367228U
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Abstract
The embodiment of the utility model discloses low noise amplifier, this low noise amplifier includes: the amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube, and a negative feedback unit connected with the first amplifying tube. The drain end of the first amplifying tube is grounded, the grid end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low-noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube. The embodiment of the utility model provides a low noise amplifier can solve low noise amplifier's the relatively poor problem of amplification effect.
Description
Technical Field
The embodiment of the utility model provides a relate to microwave technical field, especially relate to a low noise amplifier.
Background
The low noise amplifier, which is a key circuit module in a wireless radio frequency communication device, can be set in the high frequency or intermediate frequency of a radio receiver to serve as a preamplifier. In general, the noise figure and bandwidth of the lna directly determine the overall noise figure and bandwidth of the rf receiver.
However, in the related art, the noise figure of the low noise amplifier is good, but the bandwidth characteristic of the low noise amplifier is poor, so that the amplification effect of the low noise amplifier is poor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a low noise amplifier can solve low noise amplifier's the relatively poor problem of amplification effect.
In order to solve the technical problem, the embodiment of the utility model provides an adopt following technical scheme:
the utility model discloses a first aspect of the embodiment provides a low noise amplifier, and this low noise amplifier includes: the amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube, and a negative feedback unit connected with the first amplifying tube. The drain end of the first amplifying tube is grounded, the grid end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low-noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube.
In an embodiment of the present invention, the low noise amplifier includes: the amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube, and a negative feedback unit connected with the first amplifying tube. The drain end of the first amplifying tube is grounded, the grid end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low-noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube. Since the input signal Vin is in the first amplifier tube M1A second amplifier tube M2Is in opposite phase at the gate terminal and the drain terminal, and the first resistor R1The phases of the generated noises at the two points are in phase, so that the two noises in phase act on the two ends of the grid source of the amplifier tube, and the difference value of the two noises is obtained by the second amplifier tube M2Amplifying and forming voltage at the output end, and forming noise cancellation to a certain extent due to the same phase of the two, thereby eliminating the first resistor R to a certain extent1Brought about extraNoise, so can promote the amplification effect of noise amplifier.
Drawings
Fig. 1 is a circuit diagram of a low noise amplifier according to an embodiment of the present invention;
fig. 2 is a second circuit diagram of a low noise amplifier according to an embodiment of the present invention;
fig. 3 is a third circuit diagram of a low noise amplifier according to an embodiment of the present invention;
fig. 4 is a fourth circuit diagram of a low noise amplifier according to an embodiment of the present invention;
fig. 5 is a fifth circuit diagram of a low noise amplifier according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first" and "second" and the like in the description and claims of the embodiments of the present invention are used for distinguishing different objects, not for describing a specific order of the objects. For example, the first and second amplifier tubes, etc. are used to distinguish between different amplifier tubes, and are not used to describe a particular order of amplifier tubes.
In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specified. For example, a plurality of elements refers to two elements or more.
The term "and/or" herein is an association relationship describing an associated object, and means that there may be three relationships, for example, a display panel and/or a backlight, which may mean: there are three cases of a display panel alone, a display panel and a backlight at the same time, and a backlight alone. The symbol "/" herein denotes a relationship in which the associated object is or, for example, input/output denotes input or output.
In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The embodiment of the utility model provides a low noise amplifier, this low noise amplifier includes: the amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube, and a negative feedback unit connected with the first amplifying tube. The drain end of the first amplifying tube is grounded, the grid end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low-noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube. Since the input signal Vin is in the first amplifier tube M1A second amplifier tube M2Is in opposite phase at the gate terminal and the drain terminal, and the first resistor R1The phases of the generated noises at the two points are in phase, so that the two noises in phase act on the two ends of the grid source of the amplifier tube, and the difference value of the two noises is obtained by the second amplifier tube M2Amplifying and forming voltage at the output end, and forming noise cancellation to a certain extent due to the same phase of the two, thereby eliminating the first resistor R to a certain extent1The additional noise brought by the noise amplifier can improve the amplification effect of the noise amplifier.
The low noise amplifier provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
The embodiment of the utility model provides a low noise amplifier, as shown in figure 1, the utility model provides a low noise amplifier includes: first amplifier tube M1And the firstAmplifying tube M1Second amplifying tube M connected2And with the first amplifier tube M1A negative feedback unit 10 connected.
In an embodiment of the present invention, the first amplifier tube M1The drain terminal of the first amplifier tube M is grounded1The gate terminal of the first amplifier tube M is connected with a signal source1Source end and second amplifier tube M2Is connected to the drain terminal of the second amplifier tube M2The source end of the low-noise amplifier is connected with the output end of the low-noise amplifier; the negative feedback unit 10 is respectively connected to the first amplifier tube M1Gate terminal of, first amplifier tube M1Is connected with the source end of the transformer.
It will be appreciated that the first amplification tube M can be used1The negative feedback unit 10 is connected in parallel between the gate end and the drain end of the low noise amplifier, so that the bandwidth of the inductance source negative feedback low noise amplifier is increased by the loop gain times, and the circuit bandwidth can be effectively increased. Through formula derivation and small signal analysis, it can be found that the polarities of the noise generated by the negative feedback unit 10 at the two ends of the negative feedback unit 10 are in-phase, and the polarities of the useful signal at the two ends of the negative feedback unit 10 are in-phase. Therefore, the circuit structure can be designed, and the results of useful signal superposition and noise signal cancellation can be realized.
Optionally, in an embodiment of the present invention, the first amplifier tube M1Specifically, the second amplifier tube M may be an MOS tube2Specifically, the tube may be a cascade tube.
It can be understood that a noise-cancelled negative feedback low noise amplifier can be formed by short-circuiting the gate terminals of the amplifier tube (i.e., the first amplifier tube) and the cascode tube (i.e., the second amplifier tube) while adding the negative feedback unit 10. Through small signal analysis, noise signals of a gate end and a source end of the cascode tube are in phase, a useful signal is in phase opposition, and an output signal Vout is amplification of a difference value of gate-source voltages of the cascode tube, so that the structure can effectively reduce noise contribution brought by resistance.
Optionally, in the embodiment of the present invention, the negative feedback unit 10 is used for generating noise to offset the first amplifier tube M1And a second amplifier tube M2Produced byNoise.
Optionally, in a possible embodiment of the present invention, in combination with fig. 1, as shown in fig. 2, the negative feedback unit 10 includes a first resistor R1(ii) a The first resistor R1First end of and first amplifier tube M1The first resistor R1Second end of and first amplifier tube M1Is connected to the source terminal of the first resistor R1And a second amplifying tube M1The drain terminal of (1) is connected.
Optionally, in another possible embodiment of the present invention, referring to fig. 1, as shown in fig. 3, the negative feedback unit 10 includes a first resistor R1(ii) a The first resistor R1First end of and first amplifier tube M1The first resistor R1The first end of the first amplifier tube M2The first resistor R1Second end of and first amplifier tube M1Is connected to the source terminal of the first resistor R1And a second amplifying tube M2The drain terminal of (1) is connected.
Optionally, in an embodiment of the present invention, the input signal Vin output from the signal source passes through the first amplifier tube M1Into a low noise amplifier, M1Is connected to ground. The drain end of the first amplifying tube M1 is connected with the second amplifying tube M2While the first amplifier tube M1And a second amplifier tube M2Are connected together, a resistor R1Both ends are respectively connected with M1And M2Gate terminal and drain terminal. Second amplifier tube M2The drain terminal of the transistor is connected with a power supply VDD, and an output signal Vout is positioned at M2At the drain end.
It can be understood that the utility model discloses compare with traditional inductance source level negative feedback low noise amplifier, promoted the bandwidth of circuit through increasing feedback resistance, again through the form with the grid end short-circuit connection of amplifier tube and cascade pipe, the noise that feedback resistance brought has been eliminated to a certain extent. Therefore, the utility model discloses can realize broadband, low noise's requirement simultaneously, can be applied to in the multiple radio frequency receiver front end.
OptionallyIn the embodiment of the present invention, in combination with fig. 1, as shown in fig. 4 and 5, the low noise amplifier further includes a first inductor L1(ii) a Wherein, the first inductance L1Is connected with a signal source, a first inductor L1Second end of and first amplifier tube M1The grid end of the grid is connected; the low noise amplifier further comprises a second inductor L2(ii) a Wherein the second inductor L2The first terminal of the second inductor L is grounded, and the second inductor L2The second end of the first amplifier tube is connected with the drain end of the first amplifier tube; the low noise amplifier further comprises a third inductor L3(ii) a Wherein the third inductor L3First end of and second amplifier tube M2Is connected to the source terminal of the third inductor L3Is connected to the output of the low noise amplifier.
It can be understood that the input signal Vin passes through the inductor L1Into the circuit, the first inductor L1The other end of the first amplifier tube M is connected with the first amplifier tube M1，M1Source end of which is connected with a second inductor L2The second inductance L2And the other end of which is connected to ground. First amplifier tube M1The drain end of the first amplifier tube is connected with a second amplifier tube M2While the first amplifier tube M1And a second amplifier tube M2Are connected together, a first resistor R1Two ends of the first amplifier tube M are respectively connected with1And a second amplifier tube M2Gate terminal and drain terminal. Second amplifier tube M2The drain terminal of the inductor is connected with a third inductor L3The third inductor L3The other end of the second amplifier is connected with a power supply VDD, and an output signal Vout is positioned in the second amplifier tube M2Drain terminal and third inductor L3The joint of (1).
In the embodiment of the present invention, the useful signal is in the first amplifier tube M1A second amplifier tube M2The phases at the gate terminal and the drain terminal of (a) are inverted; a first resistor R1The resulting noise is in phase at these two points. Two same-phase noises act on two ends of a grid source of the amplifier tube, and the difference value of the two noises is amplified by a second amplifier tube M2Amplifying and forming voltage at the output end, and forming noise cancellation to a certain extent due to the same phase of the two, thereby eliminating the first resistor R to a certain extent1Additional noise is introduced. The useful signal is in opposite phase at two ends of the gate and source of the amplifier tube, and the difference between the useful signal and the useful signal is amplified by the second amplifier tube M2And the signal is amplified to the output end to form signal superposition to a certain extent, so that the gain of the circuit is improved.
The embodiment of the utility model provides a low noise amplifier, this low noise amplifier includes: the amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube, and a negative feedback unit connected with the first amplifying tube. The drain end of the first amplifying tube is grounded, the grid end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low-noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube. Since the input signal Vin is in the first amplifier tube M1A second amplifier tube M2Is in opposite phase at the gate terminal and the drain terminal, and the first resistor R1The phases of the generated noises at the two points are in phase, so that the two noises in phase act on the two ends of the grid source of the amplifier tube, and the difference value of the two noises is obtained by the second amplifier tube M2Amplifying and forming voltage at the output end, and forming noise cancellation to a certain extent due to the same phase of the two, thereby eliminating the first resistor R to a certain extent1The additional noise brought by the noise amplifier can improve the amplification effect of the noise amplifier.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (6)
1. A low noise amplifier, comprising: the negative feedback amplifier comprises a first amplifying tube, a second amplifying tube connected with the first amplifying tube and a negative feedback unit connected with the first amplifying tube;
the drain end of the first amplifying tube is grounded, the gate end of the first amplifying tube is connected with a signal source, the source end of the first amplifying tube is connected with the drain end of the second amplifying tube, and the source end of the second amplifying tube is connected with the output end of the low noise amplifier; the negative feedback unit is respectively connected with the grid end of the first amplifying tube and the source end of the first amplifying tube.
2. The low noise amplifier of claim 1, wherein the negative feedback unit comprises a first resistor; the first end of the first resistor is connected with the grid end of the first amplifying tube, the second end of the first resistor is connected with the source end of the first amplifying tube, and the second end of the first resistor is further connected with the drain end of the second amplifying tube.
3. The low noise amplifier of claim 1, wherein the negative feedback unit comprises a first resistor; the first end of the first resistor is connected with the grid end of the first amplifier tube, the first end of the first resistor is further connected with the grid end of the second amplifier tube, the second end of the first resistor is connected with the source end of the first amplifier tube, and the second end of the first resistor is further connected with the drain end of the second amplifier tube.
4. The low noise amplifier of any one of claims 1 to 3, further comprising a first inductor; the first end of the first inductor is connected with the signal source, and the second end of the first inductor is connected with the gate end of the first amplifying tube.
5. The low noise amplifier of any one of claims 1 to 3, further comprising a second inductor; the first end of the second inductor is grounded, and the second end of the second inductor is connected with the drain end of the first amplifying tube.
6. The low noise amplifier of any one of claims 1 to 3, further comprising a third inductor; the first end of the third inductor is connected with the source end of the second amplifying tube, and the second end of the third inductor is connected with the output end of the low noise amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021145374.XU CN212367228U (en) | 2020-06-18 | 2020-06-18 | Low-noise amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021145374.XU CN212367228U (en) | 2020-06-18 | 2020-06-18 | Low-noise amplifier |
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| CN212367228U true CN212367228U (en) | 2021-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654245A (en) * | 2020-06-18 | 2020-09-11 | 西安博瑞集信电子科技有限公司 | Low-noise amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654245A (en) * | 2020-06-18 | 2020-09-11 | 西安博瑞集信电子科技有限公司 | Low-noise amplifier |
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Address after: Building 12, Hard Technology Enterprise Community, No. 3000 Biyuan Second Road, High tech Zone, Xi'an City, Shaanxi Province, 710065 Patentee after: Borui Jixin (Xi'an) Electronic Technology Co.,Ltd. Address before: 22nd floor, East Building, block B, Tengfei Kehui City, 88 Tiangu 7th Road, Yuhua Street office, high tech Zone, Xi'an, Shaanxi 710000 Patentee before: XI'AN BORUI JIXIN ELECTRONIC TECHNOLOGY Co.,Ltd. |