CN109120236A - Gain circuitry - Google Patents
Gain circuitry Download PDFInfo
- Publication number
- CN109120236A CN109120236A CN201811306885.2A CN201811306885A CN109120236A CN 109120236 A CN109120236 A CN 109120236A CN 201811306885 A CN201811306885 A CN 201811306885A CN 109120236 A CN109120236 A CN 109120236A
- Authority
- CN
- China
- Prior art keywords
- capacitance
- low
- noise amplifier
- gain circuitry
- inductance
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
Abstract
Gain circuitry provided in an embodiment of the present invention, comprising: short antenna, inductance and low-noise amplifier；The short antenna, inductance and low-noise amplifier are sequentially connected in series；Adjustable input capacitance is provided in the low-noise amplifier；One end of the adjustable input capacitance is connected by the input terminal of the low-noise amplifier with the inductance, other end ground connection.By the capacitance for adjusting adjustable input capacitance in the low-noise amplifier, change the working frequency of the low-noise amplifier, when the working frequency of the low-noise amplifier and short antenna frequency input signal match, resonance occurs for circuit, when resonance occurs for circuit, the low-noise amplifier amplifies the voltage of the short antenna input signal, realizes the voltage gain of the short antenna input signal.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of gain circuitry.
Background technique
FM (frequencymodulation) frequency modulation broadcasting transmits programme content using warbled radio wave
A kind of broadcast technology, since it can support stereo, the good feature of acoustical quality, many electronic products, which are all configured with, receives FM
The function of fm broadcast signal.The operating frequency range of FM is 76MHz~108MHz, according to conventional aerial having a size of working frequency
The 1/4 of wavelength calculates, and the length requirement of FM antenna is about 0.75 meter, in order to guarantee enough antenna lengths, many past electricity
The FM antenna of sub- product generally uses telescopic antenna or makees antenna with earphone.
With the development of technology, modern electronic product increasingly pursues frivolous beauty, easy-to-use, so using pull rod day
Line makes antenna of earphone and receives FM fm broadcast signal and obviously do not adapt to that electronic product is beautiful convenient to be required.Go out thus
Miniature antenna is showed, which is built in electronic product, but is postponed in miniature antenna because effective length is short, increases
Benefit can become smaller, and radio reception effect is made to be deteriorated.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of gain circuitries, are able to ascend the signal gain of short antenna.
A kind of gain circuitry, comprising: short antenna, inductance and low-noise amplifier；
The short antenna, inductance and low-noise amplifier are sequentially connected in series；
Adjustable input capacitance is provided in the low-noise amplifier；
One end of the adjustable input capacitance is connected by the input terminal of the low-noise amplifier with the inductance, separately
One end ground connection.
Above-mentioned method, optionally, the adjustable input capacitance include multiple capacitance groups；
Each capacitance group is parallel with one another；
One end of each capacitance group is connected with the input terminal of the low-noise amplifier, other end ground connection；
It include control switch and the fixed capacity with constant capacitance in each capacitance group；The control switch with
The fixed capacity is connected in series.
Above-mentioned method, optionally, the gain circuitry further include: control circuit；
The control circuit is connected with each capacitance group in the adjustable input capacitance respectively；
The control circuit output control signal, controls the closure or unlatching of control switch in each capacitance group.
Above-mentioned method, optionally, the control circuit are Digital Logical Circuits or multiplex decoder.
Compared with prior art, the present invention includes the following advantages:
Gain circuitry provided in an embodiment of the present invention, comprising: short antenna, inductance and low-noise amplifier；The short antenna,
Inductance and low-noise amplifier are sequentially connected in series；Adjustable input capacitance is provided in the low-noise amplifier；The adjustable input
One end of capacitor is connected by the input terminal of the low-noise amplifier with the inductance, other end ground connection.By adjusting institute
The capacitance for stating adjustable input capacitance in low-noise amplifier changes the working frequency of the low-noise amplifier, when described low
When the working frequency and short antenna frequency input signal of noise amplifier match, resonance occurs for circuit, when resonance occurs for circuit
When, the low-noise amplifier amplifies the voltage of the short antenna input signal, realizes the short antenna input letter
Number voltage gain.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of gain circuitry figure provided by the invention；
Fig. 2 is a kind of another circuit diagram of gain circuitry provided by the invention；
Fig. 3 is a kind of another circuit diagram of gain circuitry provided by the invention；
Fig. 4 is a kind of another circuit diagram of gain circuitry provided by the invention；
Fig. 5 is a kind of another circuit diagram of gain circuitry provided by the invention；
Fig. 6 is a kind of another circuit diagram of gain circuitry provided by the invention；
Fig. 7 is a kind of structural schematic diagram of control circuit provided by the invention；
Fig. 8 is a kind of gain effect figure of gain circuitry provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of gain circuitries, improve short antenna signal transmission gain to realize.
With reference to Fig. 1, the structure chart of gain circuitry of the embodiment of the present invention is shown, comprising:
Short antenna 101, inductance 102 and low-noise amplifier 103；
The short antenna 101, inductance 102 and low-noise amplifier 103 are sequentially connected in series；
Adjustable input capacitance 104 is provided in the low-noise amplifier；
The input terminal and the inductance 102 that one end of the adjustable input capacitance 104 passes through the low-noise amplifier 103
It is connected, other end ground connection.
In gain circuitry provided by the invention, the short antenna 101, inductance 102 and low-noise amplifier 103 are successively gone here and there
Connection, the adjustable input capacitance 104 are arranged in the low-noise amplifier 103, and one end of the adjustable input capacitance 104 is logical
The input terminal for crossing the low-noise amplifier 103 is connected with the inductance 102；
The adjustable input capacitance 104 is used for, by adjusting the capacitance of the adjustable input capacitance 104, described in adjustment
The working frequency of low-noise amplifier 103；
The low-noise amplifier 103 is used for, and gain is carried out to the input signal of short antenna 101, when the low noise is put
Big 103 working frequency of device and the short antenna frequency input signal reach when matching, and the low-noise amplifier is to described short
The voltage of antenna input signal amplifies, and realizes the voltage gain of the short antenna input signal.
In gain circuitry provided by the invention, with reference to Fig. 2, it is preferred that the short antenna can be equivalent inductance 201, institute
Equivalent inductance 201, inductance 202 and low-noise amplifier 203 is stated to be sequentially connected in series；Being provided in the low-noise amplifier 203 can
Adjust input capacitance 204；One end of the adjustable input capacitance 204 by the input terminal of the low-noise amplifier 203 with it is described
Inductance 202 is connected, other end ground connection.
Gain circuitry provided in an embodiment of the present invention, it is preferred that the short antenna be FM antenna, the FM built-in antenna in
In communication apparatus, the voltage gain of the FM antenna input signal is can be improved in the gain circuitry provided through the embodiment of the present invention.
Gain circuitry provided in an embodiment of the present invention, comprising: short antenna, inductance and low-noise amplifier；The short antenna,
Inductance and low-noise amplifier are sequentially connected in series；Adjustable input capacitance is provided in the low-noise amplifier；The adjustable input
One end of capacitor is connected by the input terminal of the low-noise amplifier with the inductance, other end ground connection.The present invention is implemented
The gain circuitry that example provides changes the low noise by the capacitance of adjustable input capacitance in the adjusting low-noise amplifier
The working frequency of amplifier, when the working frequency of the low-noise amplifier matches with short antenna frequency input signal, electricity
Resonance occurs for road, and when resonance occurs for circuit, the low-noise amplifier puts the voltage of the short antenna input signal
Greatly, the voltage gain of the short antenna input signal is realized.
In gain circuitry provided in an embodiment of the present invention, adjustable input capacitance may include multiple capacitance groups；
Each capacitance group is parallel with one another；
One end of each capacitance group is connected with the input terminal of the low-noise amplifier, other end ground connection；
It include control switch and the fixed capacity with constant capacitance in each capacitance group；The control switch with
The fixed capacity is connected in series.
Gain circuitry provided in an embodiment of the present invention, with reference to Fig. 3, the multiple capacitance group is parallel with one another, and each capacitor
One end of group is connected with the input terminal of the low-noise amplifier, other end ground connection, opens in each capacitance group comprising control
It closes and the fixed capacity with constant capacitance, the control switch is connected in series with the fixed capacity.The fixed capacity can
To be MIM capacitor (metal-separation layer-metal) or MOM (metal-oxide-metal) capacitor.
Gain circuitry provided in an embodiment of the present invention, with reference to Fig. 4, it is preferred that the capacitance group is four capacitance groups, described
The connection type of multiple capacitance groups is identical as the connection type of above-mentioned multiple capacitance groups.
Gain circuitry provided in an embodiment of the present invention, can be by manually opened or closure control switch, can described in adjusting
The capacitance of input capacitance is adjusted, the capacitance of the adjustable input capacitance is equal to the electricity that each control switch is in closed
The summation of appearance group.
In gain circuitry provided in an embodiment of the present invention, it is preferred that the gain circuitry can also include: control circuit；
The control circuit is connected with each capacitance group in the adjustable input capacitance respectively；
The control circuit output control signal, controls the closure or unlatching of control switch in each capacitance group.
Gain circuitry provided in an embodiment of the present invention, with reference to Fig. 5, the control circuit respectively with the adjustable input capacitance
In each capacitance group be connected；The control circuit is controlled in each capacitance group by exporting different control signals
The closure or unlatching of control switch V1, V2, V3, V4, to adjust the capacitance of adjustable input capacitance.The adjustable input capacitance
Capacitance be equal to each control switch be in closed capacitance group summation.For example, when only control is opened in circuit
When closing V1 closing conjunction, the capacitance of tunable capacitor is Cin=C1, and when control switch V1, V2 is closed, control switch V3, V4 is disconnected
When, the capacitance of tunable capacitor is Cin=C1+C2.By controlling different control switch closures, adjustable input electricity can be realized
The capacitance variation of appearance.
Gain circuitry provided in an embodiment of the present invention, it should be noted that in adjustable input capacitance of the invention, the control
The quantity of system switch and the fixed capacity is not only limited to four control switches and four fixed capacities, using different number
The case where control switch or fixed capacity are to realize capacitance value belongs within protection scope of the present invention.
Gain circuitry provided in an embodiment of the present invention, the control circuit can be Digital Logical Circuits or multichannel decoding electricity
Road.
The gain circuitry that inventive embodiments provide, can be using Digital Logical Circuits or multiplex decoder as control electricity
Road.The Digital Logical Circuits or multiplex decoder control the adjustable input capacitance by exporting different control signals
The closure or unlatching of middle control switch, to adjust the capacitance of adjustable input capacitance.
A kind of structural schematic diagram of gain circuitry provided in an embodiment of the present invention, with reference to Fig. 6, specifically include short antenna 301,
Inductance 302, low-noise amplifier 303 and control circuit 305；Adjustable input capacitance 304 is provided in the low-noise amplifier；
Preferably, the specific schematic diagram of internal structure of control circuit 305 described in Fig. 6 is as shown in fig. 7, specifically can wrap
Include: the enabled circuit in inside counts power supply, counting circuit and coding circuit；The inside enables circuit, counts power supply, counts
Circuit and coding circuit are sequentially connected in series；The inside enables circuit and is used for when receiving enable signal to the counting power supply
Send enabling signal；The power supply that counts is used to judge institute when receiving the enabling signal that the enabled circuit in the inside is sent
Whether the period for stating enable signal is less than the preset triggering period, enters power-up state when being not less than；The counting circuit is used
In in the pulse number for counting and being calculated when power supply is in power-up state in the enable signal；The coding circuit is for producing
Raw logic level corresponding with the pulse number, and according to adjustable input capacitance in the logic level low-noise amplifier
Capacitance.
A kind of gain circuitry provided in an embodiment of the present invention, the control circuit are counted according to the enable signal received
Pulse number in circuit counting enable signal exports patrol corresponding with the pulse number in enable signal by coding circuit
Collect level.In conjunction with Fig. 4, adjustable input capacitance in low-noise amplifier is controlled by output logic level to the control circuit
Capacitance is illustrated: when the logic level of control circuit output is 0000, in Fig. 4 control switch V1, V2, V3 and
V4 is in an off state, and the capacitance of adjustable input capacitance is zero；When the logic level of control circuit output is 0001,
Control switch V1 closure, V2, V3 and V4 are disconnected, and the capacitance of adjustable input capacitance is Cin=C1；When the control circuit is defeated
When logic level out is 0101, control switch V1 and V3 closure, V2, V4 are disconnected, and the capacitance of adjustable input capacitance is Cin=
C2+C4.The control circuit controls the unlatching of control switch in adjustable input capacitance or closes by exporting different logic levels
It closes, realizes the capacitance variation of adjustable input capacitance.
Using gain circuitry provided in an embodiment of the present invention, when control circuit receives the enabled letter with different pulse numbers
Number when, counting circuit calculate enable signal in pulse number, pass through coding circuit output with enable signal in pulse number
Corresponding logic level realizes the switching of Different Logic level, controls the capacitor of adjustable input capacitance in low-noise amplifier
Value realizes the voltage to short antenna input signal so that low-noise amplifier working frequency matches with short antenna signal frequency
Gain.
Gain circuitry provided in an embodiment of the present invention, it is preferred that the short antenna is FM antenna, in conjunction with Fig. 8, to the present invention
The gain effect for the gain circuitry that embodiment provides is described in detail, specific as follows:
It is built in the adjustable input capacitance of low-noise amplifier by adjusting, adjusts the work frequency of the low-noise amplifier
Rate, when the working frequency of the low-noise amplifier and when FM antenna input signal frequency, which reach, to match, the low noise
The working frequency of amplifier is resonance frequency.When capacitance is transferred to maximum value, resonance frequency is minimum, when capacitance is transferred to minimum
When value, day resonance frequency highest.
With reference to Fig. 8, when curve 1 indicates that capacitance is transferred to maximum, resonance frequency 76.5MHZ, corresponding FM antenna input
The voltage gain of signal about 30dB, when curve 2 indicates that capacitance is transferred to minimum, resonance frequency 116.1MHZ, corresponding FM
The voltage gain of antenna reaches about 28dB.
In gain circuitry provided by the invention, by adjust can input capacitance, change the working frequency of low-noise amplifier,
When matching when the working frequency of the low-noise amplifier and FM antenna input signal frequency, the FM antenna of the input is defeated
The voltage for entering signal amplifies several times by the low-noise amplifier, the voltage gain of FM aerial signal is realized, wherein the electricity
Pressing gain is the ratio of the voltage of input signal and output signal, i.e. voltage gain=Vout/Vin.
The working frequency range of FM is 76MHz~108MHz, with reference to Fig. 8, it is known that, gain circuitry provided by the invention passes through tune
Section can input capacitance capacitance, circuit resonant frequency range reaches 76.5MHZ~116.1MHZ, the resonant frequency range of circuit
The working frequency range of FM can be covered, so the gain circuitry provided through the invention, each interior frequency point of the working frequency range of FM
Voltage gain may be implemented.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
For convenience of description, it is divided into various units when description apparatus above with function to describe respectively.Certainly, implementing this
The function of each unit can be realized in the same or multiple software and or hardware when invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It realizes by means of software and necessary general hardware platform.Based on this understanding, technical solution of the present invention essence
On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product
It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer equipment
(can be personal computer, server or the network equipment etc.) executes the certain of each embodiment or embodiment of the invention
Method described in part.
Gain circuitry provided by the present invention is described in detail above, specific case used herein is to this hair
Bright principle and embodiment is expounded, method of the invention that the above embodiments are only used to help understand and its
Core concept；At the same time, for those skilled in the art, according to the thought of the present invention, in specific embodiment and application
There will be changes in range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (4)
1. a kind of gain circuitry characterized by comprising short antenna, inductance and low-noise amplifier；
The short antenna, inductance and low-noise amplifier are sequentially connected in series；
Adjustable input capacitance is provided in the low-noise amplifier；
One end of the adjustable input capacitance is connected by the input terminal of the low-noise amplifier with the inductance, the other end
Ground connection.
2. gain circuitry according to claim 1, which is characterized in that the adjustable input capacitance includes multiple capacitance groups；
Each capacitance group is parallel with one another；
One end of each capacitance group is connected with the input terminal of the low-noise amplifier, other end ground connection；
It include control switch and the fixed capacity with constant capacitance in each capacitance group；The control switch with it is described
Fixed capacity is connected in series.
3. gain circuitry according to claim 2, which is characterized in that the gain circuitry further include: control circuit；
The control circuit is connected with each capacitance group in the adjustable input capacitance respectively；
The control circuit output control signal, controls the closure or unlatching of control switch in each capacitance group.
4. gain circuitry according to claim 3, which is characterized in that the control circuit is Digital Logical Circuits or multichannel
Decoding circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306885.2A CN109120236A (en) | 2018-11-05 | 2018-11-05 | Gain circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306885.2A CN109120236A (en) | 2018-11-05 | 2018-11-05 | Gain circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109120236A true CN109120236A (en) | 2019-01-01 |
Family
ID=64853739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811306885.2A Pending CN109120236A (en) | 2018-11-05 | 2018-11-05 | Gain circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109120236A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100041361A1 (en) * | 2008-08-14 | 2010-02-18 | Adedayo Ojo | Method and system for a single-ended input low noise amplifier with differential output |
| KR20100027847A (en) * | 2008-09-03 | 2010-03-11 | 연세대학교 산학협력단 | Low noise amplifier using varator diode and method of driving the same |
| CN201966872U (en) * | 2010-03-11 | 2011-09-07 | 比亚迪股份有限公司 | Low noise amplifier circuit of internal antenna |
| CN102625488A (en) * | 2012-04-19 | 2012-08-01 | 上海艾为电子技术有限公司 | Mobile terminal |
| JP2012169532A (en) * | 2011-02-16 | 2012-09-06 | Seiko Epson Corp | Integrated circuit device and electronic apparatus |
| CN203104433U (en) * | 2012-10-22 | 2013-07-31 | 上海集成电路研发中心有限公司 | Wireless communication transceiver |
| CN103916084A (en) * | 2012-12-28 | 2014-07-09 | 北京中电华大电子设计有限责任公司 | Gain adjustable low noise amplifier circuit |
| US20170019135A1 (en) * | 2015-07-15 | 2017-01-19 | Qualcomm Technologies International, Ltd. | Transmit-receive circuitry and electronic wireless device |
| CN106487402A (en) * | 2016-11-24 | 2017-03-08 | 中国科学技术大学 | The low-power consumption receiver rf front-end of radio frequency interface on comprehensive piece |
| CN106571850A (en) * | 2016-11-08 | 2017-04-19 | 北京澳丰源科技股份有限公司 | Bidirectional amplifier of TDD mode |
| US20170244442A1 (en) * | 2014-08-25 | 2017-08-24 | Renesas Electronics Corporation | Semiconductor device |
| US9847765B1 (en) * | 2016-08-16 | 2017-12-19 | Raytheon Company | Amplifier with automatic gain control |
| CN107565912A (en) * | 2017-08-25 | 2018-01-09 | 东南大学 | A kind of amplifier circuit in low noise with AF panel |
| CN108599801A (en) * | 2018-03-30 | 2018-09-28 | 深圳市盛路物联通讯技术有限公司 | A kind of the Internet of Things radio circuit and terminal of stability enhancing |
| CN108736835A (en) * | 2018-05-23 | 2018-11-02 | 东南大学 | A kind of multiband low-power consumption low-noise amplifier |
| CN208353306U (en) * | 2018-11-05 | 2019-01-08 | 上海艾为电子技术股份有限公司 | Gain circuitry |
-
2018
- 2018-11-05 CN CN201811306885.2A patent/CN109120236A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100041361A1 (en) * | 2008-08-14 | 2010-02-18 | Adedayo Ojo | Method and system for a single-ended input low noise amplifier with differential output |
| KR20100027847A (en) * | 2008-09-03 | 2010-03-11 | 연세대학교 산학협력단 | Low noise amplifier using varator diode and method of driving the same |
| CN201966872U (en) * | 2010-03-11 | 2011-09-07 | 比亚迪股份有限公司 | Low noise amplifier circuit of internal antenna |
| JP2012169532A (en) * | 2011-02-16 | 2012-09-06 | Seiko Epson Corp | Integrated circuit device and electronic apparatus |
| CN102625488A (en) * | 2012-04-19 | 2012-08-01 | 上海艾为电子技术有限公司 | Mobile terminal |
| CN203104433U (en) * | 2012-10-22 | 2013-07-31 | 上海集成电路研发中心有限公司 | Wireless communication transceiver |
| CN103916084A (en) * | 2012-12-28 | 2014-07-09 | 北京中电华大电子设计有限责任公司 | Gain adjustable low noise amplifier circuit |
| US20170244442A1 (en) * | 2014-08-25 | 2017-08-24 | Renesas Electronics Corporation | Semiconductor device |
| US20170019135A1 (en) * | 2015-07-15 | 2017-01-19 | Qualcomm Technologies International, Ltd. | Transmit-receive circuitry and electronic wireless device |
| US9847765B1 (en) * | 2016-08-16 | 2017-12-19 | Raytheon Company | Amplifier with automatic gain control |
| CN106571850A (en) * | 2016-11-08 | 2017-04-19 | 北京澳丰源科技股份有限公司 | Bidirectional amplifier of TDD mode |
| CN106487402A (en) * | 2016-11-24 | 2017-03-08 | 中国科学技术大学 | The low-power consumption receiver rf front-end of radio frequency interface on comprehensive piece |
| CN107565912A (en) * | 2017-08-25 | 2018-01-09 | 东南大学 | A kind of amplifier circuit in low noise with AF panel |
| CN108599801A (en) * | 2018-03-30 | 2018-09-28 | 深圳市盛路物联通讯技术有限公司 | A kind of the Internet of Things radio circuit and terminal of stability enhancing |
| CN108736835A (en) * | 2018-05-23 | 2018-11-02 | 东南大学 | A kind of multiband low-power consumption low-noise amplifier |
| CN208353306U (en) * | 2018-11-05 | 2019-01-08 | 上海艾为电子技术股份有限公司 | Gain circuitry |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2077500C (en) | Radio transceiver | |
| CN101938613B (en) | Tracking filter for a television tuner | |
| CN209169377U (en) | A kind of antenna and terminal device | |
| CN104506205B (en) | A kind of software radio receiver radio system | |
| CN101098132B (en) | Tunable filter apparatus, systems, and methods for eliminating interference signal | |
| CN105553494B (en) | A kind of radio-frequency front-end frequency selection circuit and its signal acceptance method | |
| EP0665643A2 (en) | Variable filter | |
| CN107612568A (en) | A kind of radio-frequency front-end receiving circuit and its implementation | |
| CN102324946A (en) | The high intermediate frequency front-end circuit of numerical control short-wave receiver | |
| CN103490794A (en) | Variable shortwave antenna tuner matching network structure circuit | |
| CN208353306U (en) | Gain circuitry | |
| CN104467888A (en) | Multi-channel shortwave receiving device | |
| CN107493082A (en) | A kind of dual-passband amplifier | |
| CN201975490U (en) | Ultra-wide band CATV signal combiner | |
| CN109120236A (en) | Gain circuitry | |
| CN204304999U (en) | A kind of multichannel short-wave reception device | |
| CN108886349A (en) | Frequency varying filter, RF front-end circuit and communication terminal | |
| CN1957534B (en) | 3 band TV-RF input circuit | |
| CN114257213A (en) | Adjustable band-pass tuning frequency selection circuit, electrically tunable filter and adjusting method thereof | |
| CN104320101A (en) | Antenna self-adaptation control matching circuit | |
| Magalhães et al. | RF and IF channelizers for wide-band sensing in cognitive/software-defined-radio receivers | |
| DE60217165T2 (en) | DIGITAL AUDIO BROADCASTING-V | |
| CN112713904B (en) | Composite tuning network and antenna tuner | |
| CN202839922U (en) | High-power wide-band filter device | |
| CA1104713A (en) | Single uhf/vhf antenna system |
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 |