CN202918245U - Low noise amplifier - Google Patents
Low noise amplifier Download PDFInfo
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- CN202918245U CN202918245U CN 201220625106 CN201220625106U CN202918245U CN 202918245 U CN202918245 U CN 202918245U CN 201220625106 CN201220625106 CN 201220625106 CN 201220625106 U CN201220625106 U CN 201220625106U CN 202918245 U CN202918245 U CN 202918245U
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- Prior art keywords
- low noise
- noise amplifier
- end points
- input matching
- helical coil
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Abstract
The utility model discloses a low noise amplifier which comprises at least one circle of spiral coil formed by a wire in a winding mode, a plurality of control switches and an amplifier tube. A plurality of leading-out end points are arranged on different positions of the wire. One end of the wire serves as an input end of an input matching inductor. The plurality of leading-out end points serve as output ends of the input matching inductor. The plurality of control switches are correspondingly connected with the plurality of leading-out end points. The control switches are opened and closed according to control signals to draw forth the leading-out end points on the different positions of input matching inductor to change over inductance of the input matching inductor. The amplifier tube is connected with output ends of the plurality of control switches. According to the low noise amplifier, the low noise amplifier can work under different frequencies.
Description
Technical field
The utility model relates to integrated circuit fields, particularly a kind of low noise amplifier of changeable frequency.
Background technology
Low noise amplifier (Low-Noise Amplifier, LNA) is one of important module in the radio frequency transceiver, and its performance plays conclusive effect to whole transceiver system.Low noise amplifier is mainly used in will being received from the communication system signal amplification of antenna, so that the receiver circuit of rear class is processed.Because generally all very faint from the signal of antenna, low noise amplifier all is positioned at the position of very close antenna generally speaking to reduce loss of signal.
Be positioned at the at first one-level that whole receiver is close to antenna just because of low noise amplifier, its characteristic directly affects the quality that whole receiver receives signal.Signal in order to ensure antenna reception can correctly be recovered at the afterbody of receiver, and a good low noise amplifier need to produce alap noise and distortion in amplifying signal.
Realize that low noise amplifier high-gain and low noise key factor are impedance matching and the noise matching of input, and the factor that impedance matching and the noise matching of input had the greatest impact is the inductance of LNA first.Figure 1 shows that traditional low noise amplifier structural representation.Wherein metal-oxide-semiconductor M1 is amplifier tube, realizes the most basic enlarging function of low noise amplifier; RL is load resistance, for amplifier provides resonant load.By co-design Input matching inductance L 1, source negative feedback inductor L2 and flying capcitor Cgs, can realize 50 Ω impedance matchings of low noise amplifier input.Therefore, for traditional low noise amplifier, specific coupling input inductance L 1, source negative feedback inductor L2 and flying capcitor Cgs can realize impedance matching under characteristic frequency f0, yet this just means that also this low noise amplifier can only be applied to frequency f 0 time.
Along with the development of modern mobile communication, low noise amplifier requires to be applicable to the application of various frequencies and agreement, therefore low noise amplifier is had higher requirement.Therefore, how to realize a low noise amplifier that is applicable to different frequency, thereby make whole receiver become the receiver in a broadband, for the receiver that is applied to modern various types of communication agreement, have great significance.
The utility model content
Main purpose of the present utility model is to overcome the defective of prior art, and a kind of wideband low noise amplifier of changeable frequency is provided, so that receiver can adapt to the application of various frequencies.
For reaching above-mentioned purpose, the utility model provides a kind of low noise amplifier, comprise the Input matching inductance, it comprises at least one circle helical coil that is formed by Wire-wound, the different parts of described wire has a plurality of end points of drawing, one end of described wire is as the input of described Input matching inductance, and described a plurality of end points of drawing are as the output of described Input matching inductance; A plurality of control switchs, described a plurality of end points of drawing is drawn with correspondence from inferior top layer metallic layer and is connected described a plurality of control switch, described control switch opens or closes that according to control signal the end points of drawing of described Input matching inductance different parts is drawn, thereby switches the inductance value of described Input matching inductance; And amplifier tube, connect the output of described a plurality of control switchs.
Preferably, the described end points of drawing is arranged in described helical coil N circle and the corresponding nearest place of described control switch, and wherein N is the integer greater than 0.
Preferably, described a plurality of control switch is positioned at the same side of described helical coil.
Preferably, described helical coil is the square spiral coil.
Preferably, described a plurality of N+1/4 circle places that end points lays respectively at described Input matching inductance of drawing, wherein N is the integer more than or equal to 0.
Preferably, the described end points of drawing is positioned on the right angle of described helical coil N circle, and wherein N is the integer greater than 0.
Preferably, the number of turns of described helical coil is 5 circles.
Preferably, described helical coil is the round screw thread coil.
Preferably, the described end points of drawing is positioned at the centre that described helical coil N encloses.
Preferably, the number of turns of described helical coil is 6 circles.
Preferably, the grid of described amplifier tube connects described a plurality of control switch, and its source electrode is through source negative feedback inductor ground connection, and its drain electrode connects the output of described low noise amplifier.
Preferably, described low noise amplifier also comprises: flying capcitor is connected across between the grid and source electrode of described amplifier tube; And load resistance, be connected between the drain electrode and power supply of described amplifier tube.
Preferably, described control switch is the MOSFET pipe.
Preferably, described amplifier tube is metal-oxide-semiconductor.
The utility model has the advantage of, by switching Input matching inductance winding turns so that inductance value is discrete variable, and then the operating frequency that realizes low noise amplifier is adjustable so that low noise amplifier can be applied to different frequency, Effective Raise the operating efficiency of receiver.
Description of drawings
Fig. 1 is the structural representation of low noise amplifier in the prior art.
Fig. 2 is the structural representation of the utility model embodiment low noise amplifier.
Fig. 3 is the equivalent circuit diagram of the utility model embodiment low noise amplifier.
Embodiment
For making content of the present utility model more clear understandable, below in conjunction with Figure of description, content of the present utility model is described further.Certainly the utility model is not limited to this specific embodiment, and the known general replacement of those skilled in the art also is encompassed in the protection range of the present utility model.
Low noise amplifier of the present utility model comprises Input matching inductance L 1, a plurality of control switchs and amplifier tube M1.Wherein, Input matching inductance L 1 comprises the helical coil that is formed by the Wire-wound that is positioned at top layer metallic layer, and the number of turns of helical coil is at least a circle, and the different parts on the wire also has a plurality of end points of drawing, and draws end points and draws from inferior top layer metallic layer.One end of wire is as the input of Input matching inductance, and these draw the output that end points then can be used as the Input matching inductance.A plurality of control switchs are drawn the corresponding connection of end points with a plurality of.In an embodiment of the present utility model, draw end points and be arranged in the helical coil N circle position nearest with corresponding control switch, wherein, N is the integer greater than 0.Better, control switch all is positioned at the same side of helical coil, the benefit of doing like this is, because a plurality of drawing is connected many strip metals of needs line between end points and a plurality of control switchs, can make follow-up metal line more flexible by the above-mentioned distribution mode of drawing end points and control switch.Certainly, in other embodiment of the present utility model, also a plurality of end points of drawing can be set at the different parts of same circle, or in a plurality of coils, only arrange one and draw end points.In another embodiment of the present utility model, as shown in Figure 2, the helical coil of Input matching inductance L 1 is the square spiral coil, the number of turns is 5 circles, and at the 1st and 1/4 circle, the 2nd and 1/4 circle, the 3rd not only 1/4 circle and the 4th but also 1/4 circle place have the end points of drawing, certainly draw end points and also can be arranged on other right angles of helical coil, the benefit that is arranged on the right angle is and can draws drawing end points more easily.Certainly, helical coil also can be the round screw thread coil, and the number of turns for example is 6 circles, draws 1/2 position that end points can be positioned at coil.Please continue with reference to figure 2, draw the output that end points 1 ~ 4 all can be used as Input matching inductance L 1 on the wire, the wherein end that the input of Input matching inductance L 1 that is to say wire is then as the input of low noise amplifier.The end points of drawing of wire is drawn from inferior top layer metallic layer, corresponding connection with control switch, thus control switch links to each other with the output of Input matching inductance L 1.Control switch can be the MOSFET pipe, is formed on the substrate.In the present embodiment, control switch is positioned at the same side of Input matching inductance L 1, control switch S1 ~ S4 is connected respectively and draws end points 1 ~ 4, control switch is controlled its open and-shut mode by control signal, thus select to draw accordingly end points as the output of Input matching inductance L 1 to switch the inductance value of Input matching inductance L 1.Amplifier tube M1 connects the output of control switch S1 ~ S4, is used for realizing the enlarging function of low noise amplifier.Specifically, amplifier tube M1 is MOS transistor, be formed on the substrate, its grid connects the output of control switch S1 ~ S4, its source electrode is through source negative feedback inductor L2 ground connection, and cross-over connection one flying capcitor Cgs between grid and the source electrode, and its drain electrode connects power supply through feedback resistance RL, simultaneously its drain electrode can be used as the output of low noise amplifier, or connects the output of low noise amplifier.
Next, the working method of wideband low noise amplifier of the changeable frequency of the utility model embodiment will be elaborated.
Please refer to Fig. 2, when control signal so that control switch S1 closes, all the other control switch S2, S3, when S4 opens, wire terminals point 1 connects the grid of amplifier tube M1, the number of turns of the helical coil of whole Input matching inductance L 1 is 4 and 1/4 circle, in this preferred embodiment, the inductance value L11 of this Input matching inductance is 15nH;
When control signal diverter switch S2 closes, rest switch S1, S3, when S4 opens, wire terminals point 2 connects the grid of amplifier tube M1 as the output of Input matching inductance L 1, the number of turns of the helical coil of whole Input matching inductance L 1 is 3 and 1/4 circle, in this preferred embodiment, this Input matching inductance inductance value L12 be 12nH;
When control signal diverter switch S3 closes, rest switch S1, S2, when S4 opens, wire terminals point 3 connects the grid of amplifier tube M1, the number of turns of the helical coil of whole Input matching inductance L 1 is 2 and 1/4 circle, and in this preferred embodiment, the inductance value L13 of this Input matching inductance is 9nH;
When control signal diverter switch S4 closes, rest switch S1, S2, when S3 opens, wire terminals point 4 connects the grid of amplifier tube M1, the number of turns of the helical coil of whole Input matching inductance L 1 is 1 and 1/4 circle, and in this preferred embodiment, the inductance value L14 of this Input matching inductance is 6nH.
Therefore, operating state by control signal diverter switch S1, S2, S3, S4, the inductance value that Input matching inductance L 1 can show is respectively L11, L12, L13, L14, L11 wherein〉L12〉L13〉L14, be that Input matching inductance L 1 shows different inductance value, thereby can in the situation that does not increase the inductance equivalent area, realize the discrete variable of inductance value.
Figure 3 shows that the equivalent circuit diagram of the utility model low noise amplifier, low noise amplifier operating frequency and Input matching formula are as follows:
Wherein L1 represents the Input matching inductance value, and L2 represents the source negative feedback inductor value, and C1 represents the value of cross-over connection resistance Cgs, g
mRepresent the transconductance value of amplifier tube M1.By formula (1) as can be known, the resonance of low noise amplifier (work) angular frequency is determined by the inverse of (L1+L2) C1, thus, open and-shut mode as diverter switch S1, S2, S3, S4, when making whole Input matching inductance L 1 show different inductance value, then the operating frequency of low noise amplifier also will respective change, thereby has realized a kind of wideband low noise amplifier of changeable frequency.In addition, according to formula (2) as can be known, with regard to whole low noise amplifier, only Input matching inductance L 1 changes, and source negative feedback inductor L2, cross-over connection resistance C1, load resistance RL all do not change, therefore can't have influence on impedance matching, that is to say that can satisfy equally this low noise amplifier realizes impedance matching under different frequencies.
In preferred embodiment of the present utility model, as control signal diverter switch S1, S2, S3, when S4 closes, whole Input matching inductance L 1 shows different inductance value 15nH, 12nH, 9nH, 6nH, and the operating frequency of low noise amplifier is corresponding can the switching in f1=480MHz, f2=570MHz, f3=660MHz, f4=740MHz then.This shows that whole low noise amplifier has covered operating frequency 480MHz～740MHz, thus realized a kind of in 480MHz～740MHz the wideband low noise amplifier of changeable frequency.
To sum up, the low noise amplifier that the utility model proposes, in the situation that does not increase inductance series connection equivalent area, make inductance value discrete variable by switching Input matching inductance winding turns, and then the operating frequency that realizes low noise amplifier is adjustable, so that low noise amplifier can be applied to different frequency, improved operating efficiency, reduced energy consumption.
Although the utility model discloses as above with preferred embodiment; right described many embodiment only give an example for convenience of explanation; be not to limit the utility model; those skilled in the art can do some changes and retouching under the prerequisite that does not break away from the utility model spirit and scope, the protection range that the utility model is advocated should be as the criterion so that claims are described.
Claims (13)
1. a low noise amplifier is characterized in that, comprising:
The Input matching inductance, it comprises at least one circle helical coil that is formed by Wire-wound, the different parts of described wire has a plurality of end points of drawing, and an end of described wire is as the input of described Input matching inductance, and described a plurality of end points of drawing are as the output of described Input matching inductance;
A plurality of control switchs, the described a plurality of end points of drawing of corresponding connection, described control switch opens or closes that according to control signal the end points of drawing of described Input matching inductance different parts is drawn, thereby switches the inductance value of described Input matching inductance; And
Amplifier tube connects the output of described a plurality of control switchs.
2. low noise amplifier according to claim 1 is characterized in that, the described end points of drawing is arranged in described helical coil N circle and the corresponding nearest place of described control switch, and wherein N is the integer greater than 0.
3. low noise amplifier according to claim 2 is characterized in that, described a plurality of control switchs are positioned at the same side of described helical coil.
4. low noise amplifier according to claim 1 is characterized in that, described helical coil is the square spiral coil.
5. low noise amplifier according to claim 4 is characterized in that, the described end points of drawing is positioned on the right angle of described helical coil N circle, and wherein N is the integer greater than 0.
6. low noise amplifier according to claim 5 is characterized in that, the number of turns of described helical coil is 5 circles.
7. low noise amplifier according to claim 1 is characterized in that, described helical coil is the round screw thread coil.
8. low noise amplifier according to claim 7 is characterized in that, the described end points of drawing is positioned at the centre that described helical coil N encloses.
9. low noise amplifier according to claim 8 is characterized in that, the number of turns of described helical coil is 6 circles.
10. low noise amplifier according to claim 1 is characterized in that, the grid of described amplifier tube connects described a plurality of control switch, and its source electrode is through source negative feedback inductor ground connection, and its drain electrode connects the output of described low noise amplifier.
11. low noise amplifier according to claim 10 is characterized in that, described low noise amplifier also comprises:
Flying capcitor is connected across between the grid and source electrode of described amplifier tube; And
Load resistance is connected between the drain electrode and power supply of described amplifier tube.
12. low noise amplifier according to claim 1 is characterized in that, described control switch is the MOSFET pipe.
13. low noise amplifier according to claim 1 is characterized in that, described amplifier tube is metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625106 CN202918245U (en) | 2012-11-23 | 2012-11-23 | Low noise amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625106 CN202918245U (en) | 2012-11-23 | 2012-11-23 | Low noise amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN202918245U true CN202918245U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220625106 Expired - Lifetime CN202918245U (en) | 2012-11-23 | 2012-11-23 | Low noise amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983818A (en) * | 2012-11-23 | 2013-03-20 | 上海集成电路研发中心有限公司 | Low-noise amplifier |
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2012
- 2012-11-23 CN CN 201220625106 patent/CN202918245U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983818A (en) * | 2012-11-23 | 2013-03-20 | 上海集成电路研发中心有限公司 | Low-noise amplifier |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |