CN111969961A - Amplifier with feedback structure - Google Patents
Amplifier with feedback structure Download PDFInfo
- Publication number
- CN111969961A CN111969961A CN202011135943.7A CN202011135943A CN111969961A CN 111969961 A CN111969961 A CN 111969961A CN 202011135943 A CN202011135943 A CN 202011135943A CN 111969961 A CN111969961 A CN 111969961A
- Authority
- CN
- China
- Prior art keywords
- amplifier
- type element
- coil type
- coil
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/42—Modifications of amplifiers to extend the bandwidth
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
Abstract
The invention provides an amplifier with a feedback structure, relates to the technical field of electronic elements, and mainly solves the technical problem of gain reduction caused by a negative feedback circuit of the amplifier. The invention comprises the following steps: an amplifier, a first coil type element, a second coil type element and a feedback device; the first coil type element is connected to the output end or the input end of the amplifier through the feedback device, and the second coil type element is directly connected to the input end or the output end of the amplifier; the feedback device is used for connecting the amplifier and the first coil type element and changing the polarity of electromagnetic coupling between coils in the coil type element. The invention utilizes the characteristic that the amplifier in the radio frequency field usually uses a plurality of coil type elements as matching elements at the input end and the output end, utilizes the electromagnetic coupling among the coil type elements and is matched with a feedback device, and can freely realize the technical effect of positive feedback or negative feedback under the condition of not additionally increasing elements and feedback circuits.
Description
Technical Field
The invention relates to the technical field of amplifiers, in particular to an amplifier with a feedback structure.
Background
In a common configuration of the amplifier, such as a Common Source (CS) configuration or a common gate common source (CASCODE) configuration, the output signal is usually inverted with respect to the input signal, and if the coil-type elements are used for matching at the output and the input, the coupling between the coils and the inverted signal of the amplifier naturally form a negative feedback circuit to cause a decrease in gain, as shown in fig. 11a and 11 b.
To ameliorate the problem of gain degradation, it is intuitive to increase the distance between the coils to reduce coupling, which is not practical given the direct reaction of wafer size to manufacturing cost. Another possibility is to use a figure 8 coil (as shown in fig. 12) to reduce the coupling between the coils, again at the expense of area, while the Q of the inductor itself is affected. Alternatively, gain boosting techniques are used to compensate for the reduced gain, such as adding a feedback circuit to the gate of the CASCODE to boost the gain, as shown in FIG. 13, but additional power consumption is required and careful design is also required to avoid potential ringing.
The methods all consume additional circuit resources and improve the design complexity, so the method provided by the invention can solve the problems.
Disclosure of Invention
One of the objectives of the present invention is to provide an amplifier with a feedback structure and an amplifier, which solve the technical problem of gain reduction caused by a negative feedback circuit of the amplifier in the prior art. Advantageous effects can be achieved in preferred embodiments of the present invention, as described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to an amplifier with a feedback structure, which comprises: an amplifier, a first coil type element, a second coil type element and a feedback device; the first coil type element is connected to the output end or the input end of the amplifier through the feedback device, and the second coil type element is directly connected to the input end or the output end of the amplifier;
the feedback device is used for connecting the amplifier and the first coil type element and changing the polarity of electromagnetic coupling between coils in the coil type element.
Further, the feedback device is a jumper.
Further, the flying lead comprises: an input end crossover or an output end crossover;
the input terminal flying lead is used for connecting the first coil type element to the input terminal of the amplifier;
the output terminal flying lead is used for connecting the first coil type element to the output terminal of the amplifier.
Further, the positive terminal of the first coil-type element is connected to the negative input terminal of the amplifier via the input flying lead, and the negative terminal is connected to the positive input terminal of the amplifier via the input flying lead.
Further, the positive terminal of the first coil-type element is connected to the negative output terminal of the amplifier via the output terminal flying lead, and the negative terminal is connected to the positive output terminal of the amplifier via the output terminal flying lead.
Further, the feedback device is a double-pole double-throw switch.
Further, the double pole double throw switch comprises: an input end double-pole double-throw switch or an output end double-pole double-throw switch;
the input side double pole double throw switch for connecting the first coil type element to the amplifier input;
the output side double pole double throw switch is used for connecting the first coil type element to the output end of the amplifier.
Further, the first coil type element and the second coil type element each include: inductors, coil transformers, and differential single-ended switches.
Further, the positive output terminal of the amplifier is connected to the positive terminal of the second coil type element, and the negative output terminal is connected to the negative terminal of the second coil type element.
Further, the amplifier has a positive input terminal connected to the positive terminal of the second coil type element and a negative input terminal connected to the negative terminal of the second coil type element.
The amplifier with the feedback structure and the amplifier provided by the invention at least have the following beneficial technical effects:
the first coil type element is connected with the input end or the output end of the amplifier through the feedback device, and the output end or the input end of the amplifier is directly connected with the second coil type element. Wherein the feedback device changes the polarity of the electromagnetic field between the coil-type elements respectively connected to the input and output of the amplifier. The feedback device can be a jumper wire and also can be a double-pole double-throw switch, the problem that the gain is reduced due to the original coil coupling can be solved by using a simple winding technique, the double-pole double-throw switch is also matched for dynamic switching, and the characteristics of simple structure, practical operation, convenience and quickness are realized.
In conventional amplifier applications, feedback is one of the common design methods, wherein positive feedback can further increase the gain without increasing the dc power consumption, and negative feedback can improve the bandwidth and stability. The invention utilizes the characteristic that the amplifier in the radio frequency field usually uses a plurality of coil-type elements as matching elements at the input end and the output end, utilizes the electromagnetic coupling among the coil-type elements, and is matched with the overline and the double-pole double-throw switch for switching, and can freely realize the effect of positive feedback or negative feedback under the condition of not additionally increasing elements and feedback circuits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an amplifier with a feedback structure according to the present invention;
FIG. 2 is a schematic diagram of another structure of an amplifier with a feedback structure according to the present invention;
FIG. 3 is a schematic diagram of a feedback device with a jumper line;
FIG. 4 is a schematic diagram of another structure of a feedback device as a flying lead;
FIG. 5 is a schematic diagram of a feedback device that is a double-pole double-throw switch;
FIG. 6 is a schematic diagram of another configuration in which the feedback device is a double-pole double-throw switch;
FIG. 7 is a schematic diagram of the structure of the double pole double throw switch itself;
FIG. 8 is a schematic diagram of an inductor structure;
FIG. 9 is a schematic diagram of a coil transformer configuration;
FIG. 10 is a schematic diagram of a differential single-ended switch;
FIG. 11a is a schematic diagram of the configuration of the amplifier output coupled to the input;
FIG. 11b is a schematic diagram of the configuration of the amplifier with the input coupled to the output;
FIG. 12 is a schematic diagram of a figure-8 coil;
FIG. 13 is a schematic diagram of the gate terminal in cascode configuration with the feedback circuit added.
In FIG. 1, 1-first coil type device, 2-amplifier, 3-second coil type device, 4-feedback device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 or fig. 2, an embodiment of an amplifier with a feedback structure according to the present invention includes: an amplifier 2, a first coil type element 1, a second coil type element 3, and a feedback device 4; the first coil-type element 1 is connected to the output end or the input end of the amplifier 2 through the feedback device 4, and the second coil-type element 3 is directly connected to the input end or the output end of the amplifier 2; the feedback device 4 is used for connecting the amplifier 1 and the first coil type element 2, and changing the polarity of electromagnetic coupling between coils in the coil type element.
The first coil type element is connected with the input end or the output end of the amplifier through the feedback device, and the output end or the input end of the amplifier is directly connected with the second coil type element. Wherein the feedback device changes the polarity of the electromagnetic field between the coil-type elements respectively connected to the input and output of the amplifier. The effect of positive feedback or negative feedback can be freely realized without adding additional components and feedback circuits.
The invention utilizes the coupling among the coil-type elements, and the coupling polarity is changed by matching with the feedback device, and the original negative feedback is changed into positive feedback, so that the gain can be kept under the condition of not consuming extra resources, and is even larger than the original gain.
In the present embodiment, the feedback device is a jumper. It should be noted that the flying lead is a cross-wound wire.
Preferably, the flying lead comprises: an input end crossover or an output end crossover; the input terminal flying lead is used for connecting the first coil type element to the input terminal of the amplifier; the output terminal flying lead is used for connecting the first coil type element to the output terminal of the amplifier.
It should be noted that, the flying lead is disposed at the input end of the amplifier or the output end of the amplifier, and the input end flying lead and the output end flying lead are named after the flying lead is disposed at different positions of the amplifier, and are flying leads per se. The invention can avoid the problem of gain reduction caused by the original coil coupling by using a simple winding technique, and changes a negative feedback mechanism generated by coupling among coil type elements.
Further, the positive terminal of the first coil-type element is connected to the negative input terminal of the amplifier via the input flying lead, and the negative terminal is connected to the positive input terminal of the amplifier via the input flying lead.
The positive output end of the amplifier is connected with the positive end of the second coil type element, and the negative output end of the amplifier is connected with the negative end of the second coil type element.
Further, the positive terminal of the first coil-type element is connected to the negative output terminal of the amplifier via the output terminal flying lead, and the negative terminal is connected to the positive output terminal of the amplifier via the output terminal flying lead.
The positive input end of the amplifier is connected with the positive end of the second coil type element, and the negative input end of the amplifier is connected with the negative end of the second coil type element.
It should be noted that, referring to fig. 3, when the flying lead is disposed at the input terminal of the amplifier, the positive terminal of the coil-type element is connected to the input negative terminal of the amplifier, and the coil-type element negative terminal is connected to the input positive terminal of the amplifier; while the output of the amplifier is normally connected to another coil-type element.
Referring to fig. 4, when the flying lead is provided at the output terminal of the amplifier, the positive end of the coil-type element is connected to the negative output terminal of the amplifier, and the negative end of the coil-type element is connected to the positive output terminal of the amplifier; while the input of the amplifier is normally connected to another coil-type element.
The invention utilizes the coupling among the coil type elements, and the coupling polarity is changed by matching with the cross winding, and the original negative feedback is changed into the positive feedback, so that the gain can be kept under the condition of not consuming extra resources, and is even larger than the original gain.
Preferably, the feedback device is a double pole double throw switch. Wherein, double-pole double-throw includes: an input end double-pole double-throw switch or an output end double-pole double-throw switch; the input side double pole double throw switch for connecting the first coil type element to the amplifier input; the output side double pole double throw switch is used for connecting the first coil type element to the output end of the amplifier.
It should be noted that the double-pole double-throw switch is disposed at the input end of the amplifier or the output end of the amplifier, and the input end double-pole double-throw switch and the output end double-pole double-throw switch are named because the double-pole double-throw switch is disposed at different positions of the amplifier, and are both double-pole double-throw switches per se. The present invention can further use a double-pole double-throw switch to switch the direction of the winding under the consideration of elasticity, i.e. the double-pole double-throw switch is used to replace the crossover wire, so as to freely select the characteristics of positive and negative feedback.
Referring to fig. 7, the connection mode of the present invention can be freely selected by the double pole double throw switch: s1 is connected to S1 ', S2 is connected to S2', or S1 is connected to S2 ', S2 is connected to S1'.
The scenario of using a double-pole double-throw switch instead of a jumper is shown in fig. 5 and 6, and the double-pole double-throw switch is arranged at the input end or the output end of the amplifier. When the double-pole double-throw is configured such that S1 is connected to S1 'and S2 is connected to S2', the feedback condition is similar to negative feedback, which can ensure the stability of the amplifier at high power output; when the double-pole double-throw is configured with S1 connected to S2 'and S2 connected to S1', the feedback condition is positive feedback, which can increase the gain during small signal operation. The free switching of the double-pole double-throw switch keeps the circuit design flexibility and can be dynamically switched according to the use scene.
The first coil-type element and the second coil-type element each include: inductors, coil transformers, and differential single-ended switches.
It should be noted that, referring to fig. 8 to 10, the coil-type element is a circuit element including any coil, such as a common inductor, a coil transformer, a differential single-ended switch, and the like. In the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The first coil type element is connected with the input end or the output end of the amplifier through the feedback device, and the output end or the input end of the amplifier is directly connected with the second coil type element. Wherein the feedback device changes the polarity of the electromagnetic field between the coil-type elements respectively connected to the input and output of the amplifier. The feedback device can be a jumper wire and also can be a double-pole double-throw switch, the problem that the gain is reduced due to the coupling of the original coil can be solved by using a simple winding technique, the dynamic switching of the double-pole double-throw switch is also matched, and the characteristics of simple structure, practical operation, convenience and quickness are realized.
In conventional amplifier applications, feedback is one of the common design methods, wherein positive feedback can further increase the gain without increasing the dc power consumption, and negative feedback can improve the bandwidth and stability. The invention utilizes the characteristic that the amplifier in the radio frequency field usually uses a plurality of coil-type elements as matching elements at the input end and the output end, utilizes the electromagnetic coupling among the coil-type elements, and is matched with the overline and the double-pole double-throw switch for switching, and can freely realize the effect of positive feedback or negative feedback under the condition of not additionally increasing elements and feedback circuits.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An amplifier having a feedback structure, comprising: an amplifier, a first coil type element, a second coil type element and a feedback device; the first coil type element is connected to the output end or the input end of the amplifier through the feedback device, and the second coil type element is directly connected to the input end or the output end of the amplifier;
the feedback device is used for connecting the amplifier and the first coil type element and changing the polarity of electromagnetic coupling between coils in the coil type element.
2. The amplifier of claim 1, wherein the feedback device is a jumper.
3. The amplifier of claim 2, wherein the flying lead comprises: an input end crossover or an output end crossover;
the input terminal flying lead is used for connecting the first coil type element to the input terminal of the amplifier;
the output terminal flying lead is used for connecting the first coil type element to the output terminal of the amplifier.
4. The amplifier of claim 3, wherein the positive terminal of the first coil-type element is connected to the negative input terminal of the amplifier through the input cross-line, and the negative input terminal is connected to the positive input terminal of the amplifier through the input cross-line.
5. The amplifier of claim 3, wherein the positive terminal of the first coil-type element is connected to the negative output terminal of the amplifier through the output terminal flying lead, and the negative output terminal is connected to the positive output terminal of the amplifier through the output terminal flying lead.
6. The amplifier of claim 1, wherein the feedback device is a double-pole double-throw switch.
7. The amplifier of claim 6, wherein the double pole double throw switch comprises: an input end double-pole double-throw switch or an output end double-pole double-throw switch;
the input side double pole double throw switch for connecting the first coil type element to the input side of the amplifier;
the output side double pole double throw switch is used for connecting the first coil type element to the output side of the amplifier.
8. The amplifier of claim 1, wherein the first coil-type element and the second coil-type element each comprise: inductors, coil transformers, and differential single-ended switches.
9. The amplifier of claim 4, wherein the positive output terminal of the amplifier is connected to the positive terminal of the second coil type element, and the negative output terminal is connected to the negative terminal of the second coil type element.
10. The amplifier of claim 5, wherein the amplifier has a positive input terminal connected to the positive terminal of the second coil type element and a negative input terminal connected to the negative terminal of the second coil type element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011135943.7A CN111969961B (en) | 2020-10-22 | 2020-10-22 | Amplifier with feedback structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011135943.7A CN111969961B (en) | 2020-10-22 | 2020-10-22 | Amplifier with feedback structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111969961A true CN111969961A (en) | 2020-11-20 |
| CN111969961B CN111969961B (en) | 2021-03-02 |
Family
ID=73387640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011135943.7A Active CN111969961B (en) | 2020-10-22 | 2020-10-22 | Amplifier with feedback structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111969961B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642079A (en) * | 1995-09-29 | 1997-06-24 | Dallas Semiconductor Corporation | Amplifier with pole/zero compensation |
| CN102124645A (en) * | 2008-05-05 | 2011-07-13 | 贾弗林半导体公司 | Controlling power with an output network |
| CN103563250A (en) * | 2011-05-19 | 2014-02-05 | 美国博通公司 | Amplifier |
| CN103904907A (en) * | 2012-12-26 | 2014-07-02 | 黄冠雄 | Alternating-current digital control voltage-regulation current-control power transmission device |
| CN104767374A (en) * | 2015-03-30 | 2015-07-08 | 中国石油天然气集团公司 | High-power signal emission control method based on DDS |
| CN106921298A (en) * | 2015-10-02 | 2017-07-04 | 大陆汽车系统公司 | Apparatus and method for determining the resonant frequency of lc circuit |
| CN109546971A (en) * | 2018-11-22 | 2019-03-29 | 绵阳市维博电子有限责任公司 | A kind of isolated amplifier with high linearity |
| US20190190453A1 (en) * | 2017-12-20 | 2019-06-20 | Globalfoundries Inc. | Power amplifier for millimeter wave devices |
| CN111384902A (en) * | 2020-03-05 | 2020-07-07 | 深圳市纽瑞芯科技有限公司 | Broadband receiver circuit with adjustable impedance matching frequency |
-
2020
- 2020-10-22 CN CN202011135943.7A patent/CN111969961B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642079A (en) * | 1995-09-29 | 1997-06-24 | Dallas Semiconductor Corporation | Amplifier with pole/zero compensation |
| CN102124645A (en) * | 2008-05-05 | 2011-07-13 | 贾弗林半导体公司 | Controlling power with an output network |
| CN103563250A (en) * | 2011-05-19 | 2014-02-05 | 美国博通公司 | Amplifier |
| CN103904907A (en) * | 2012-12-26 | 2014-07-02 | 黄冠雄 | Alternating-current digital control voltage-regulation current-control power transmission device |
| CN104767374A (en) * | 2015-03-30 | 2015-07-08 | 中国石油天然气集团公司 | High-power signal emission control method based on DDS |
| CN106921298A (en) * | 2015-10-02 | 2017-07-04 | 大陆汽车系统公司 | Apparatus and method for determining the resonant frequency of lc circuit |
| US20190190453A1 (en) * | 2017-12-20 | 2019-06-20 | Globalfoundries Inc. | Power amplifier for millimeter wave devices |
| CN109546971A (en) * | 2018-11-22 | 2019-03-29 | 绵阳市维博电子有限责任公司 | A kind of isolated amplifier with high linearity |
| CN111384902A (en) * | 2020-03-05 | 2020-07-07 | 深圳市纽瑞芯科技有限公司 | Broadband receiver circuit with adjustable impedance matching frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111969961B (en) | 2021-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW511331B (en) | Driving circuits for switch mode RF power amplifiers | |
| TW503613B (en) | Power amplifier module | |
| US7403403B2 (en) | Noise suppressor | |
| US7667541B2 (en) | Amplifier circuit and wireless communication device | |
| US7633266B2 (en) | Charger circuit and transformer used therein | |
| KR20150001698A (en) | System and method for transmitting a radio frequency signal through a speaker coil | |
| US20110260794A1 (en) | High frequency power amplifier | |
| US20060061417A1 (en) | High-frequency power amplifier module | |
| CN111969961B (en) | Amplifier with feedback structure | |
| CN113242024B (en) | Radio frequency power amplifier | |
| US20130029617A1 (en) | Voltage driving apparatus for power amplifier, power amplifying system, power supply device and communication device | |
| JP5313970B2 (en) | High frequency power amplifier | |
| WO2023221643A1 (en) | Power amplifier and chip | |
| CN104640018A (en) | Electronic equipment and audio output circuit | |
| CN116346051A (en) | AC voltage stacked power amplifier | |
| US8884698B2 (en) | Transformer and CMOS power amplifier including the same | |
| CN117378142A (en) | Low noise amplifier with built-in SUTARDJA transformer | |
| CN113676143A (en) | Channel amplifying circuit, display driving chip and driving method | |
| CN204231304U (en) | The single-ended electronic tube power amplifier circuit with recommending double structure | |
| CN112073022A (en) | Band-pass filter | |
| US20150091642A1 (en) | Method and circuitry for multi-stage amplification | |
| CN112087206A (en) | Ultra-low power consumption broadband low noise amplifier | |
| CN217957047U (en) | Balun structure and radio frequency front end module | |
| CN105450190B (en) | Electronic tube power amplifier circuit that is single-ended and recommending double structure | |
| CN109889051A (en) | A kind of DCDC isolated power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Room 601, block B, garden city digital building, 1079 Nanhai Avenue, Yanshan community, merchants street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Nanfang Silicon Valley Semiconductor Co.,Ltd. Address before: 518000 504a, block B, huayuancheng digital building, 1079 Nanhai Avenue, Yanshan community, zhaoshang street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Southern Silicon Valley Semiconductor Co.,Ltd. |
|
| CP03 | Change of name, title or address |