CN110289822A - A kind of broadband Larger Dynamic auto-gain circuit - Google Patents
A kind of broadband Larger Dynamic auto-gain circuit Download PDFInfo
- Publication number
- CN110289822A CN110289822A CN201910573026.8A CN201910573026A CN110289822A CN 110289822 A CN110289822 A CN 110289822A CN 201910573026 A CN201910573026 A CN 201910573026A CN 110289822 A CN110289822 A CN 110289822A
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- unit
- signal
- voltage controlled
- amplifying unit
- larger dynamic
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- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/52—One-way transmission networks, i.e. unilines
Abstract
The invention discloses a kind of broadband Larger Dynamic auto-gain circuits, belong to technology for radio frequency field, including voltage controlled gain amplifying unit, for under the adjusting for adjusting voltage, the different input signal of power is stabilized into the identical output signal of power, and be used to export by a part of output signal, another part output signal is for feeding back；Filter unit, it is narrowed for carrying out the feedback signal of the voltage controlled gain amplifying unit；Logarithmic amplification unit is demodulated, is demodulated for the feedback signal after being narrowed to the filter unit, and is generated using the feedback signal after demodulation and adjusts voltage, output to the voltage controlled gain amplifying unit；Applying frequency of the present invention is high, and control precision is high, and dynamic range is big, and applying frequency range is wide.
Description
Technical field
The present invention relates to technology for radio frequency fields, and in particular to a kind of broadband Larger Dynamic auto-gain circuit.
Background technique
Modern broadband wireless communication receiver, such as software radio, GPS (global positioning system), mobile TV, hearing aid
Deng in order to guarantee the dynamic range and bandwidth of A/D conversion, it is desirable that circuit can provide a sufficiently large dynamic range, high spirit
The enlarging function of sensitivity and big bandwidth.In general, needing to design AGC in receiver AFE(analog front end) to meet the requirement of dynamic range
Circuit.Traditional agc circuit is usually operated at the intermediate-frequency section less than 100MHz, but with the development of science and technology, A/D turns
The manageable frequency of parallel operation is got higher, and not needing external signal to transform to very low frequency can be converted, therefore is just needed
Use the auto-gain circuit of work at higher frequencies.Since agc circuit is influenced by factors such as device performances, it is more difficult to full simultaneously
Foot straps are wide, dynamic range and the technical indicators such as linear.
Summary of the invention
It is an object of the invention to: the present invention provides a kind of broadband Larger Dynamic auto-gain circuit, solve at present
The agc circuit narrow technical problem of signal range of receiving at high frequencies.
The technical solution adopted by the invention is as follows:
A kind of broadband Larger Dynamic auto-gain circuit, including
Voltage controlled gain amplifying unit, under the adjusting for adjusting voltage, the different input signal of power to be stabilized to function
The identical output signal of rate, and a part of output signal is used to export, another part output signal is for feeding back；
Filter unit, it is narrowed for carrying out the feedback signal of the voltage controlled gain amplifying unit；
Logarithmic amplification unit is demodulated, is demodulated for the feedback signal after being narrowed to the filter unit, and utilizes solution
Feedback signal after tune, which generates, adjusts voltage, output to the voltage controlled gain amplifying unit.
Further, the voltage controlled gain amplifying unit includes two cascade voltage control Amplifiers, described two pressures
Differential low-pass filter is connected between control gain amplifier, the differential low-pass filter is for filtering out harmonic wave.
Further, further include
Filter unit is preselected, for selecting input signal；
Amplify pretreatment unit, for amplifying to the signal of pre-selection filter unit output, and by amplified signal
It is input to the voltage controlled gain amplifying unit；
Final stage amplifying unit, the output signal for exporting to the voltage controlled gain amplifying unit amplify；
Final stage filter unit, for being filtered to the amplified output signal of final stage amplifying unit.
Further, the pre-selection filter unit is three rank elliptic filters.
Further, the amplification pretreatment unit is amplifier.
Further, the final stage amplifying unit is amplifier.
Further, the final stage filter unit is three rank elliptical low-pass wave structures.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
Broadband Larger Dynamic auto-gain circuit of the invention, the Larger Dynamic range signal for solving high intermediate frequency receives, defeated
Enter dynamic range up to 80dB, input power range is -90~-10dBm, and frequency range is 100MHz~2GHz；Frequency of use model
It encloses extensively, can be applicable to more communications reception fields；Peripheral circuit using flexible can according to need and export different power.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is structural block diagram of the invention；
Fig. 2 is the circuit diagram of present invention pre-selection filter unit；
Fig. 3 is the analogous diagram of present invention pre-selection filter unit；
Fig. 4 is voltage controlled gain amplifying unit in the present invention, filter unit, the circuit theory frame for demodulating logarithmic amplification unit
Figure；
Fig. 5 is the schematic block circuit diagram of final stage filter unit in the present invention；
Fig. 6 is the analogous diagram of final stage filter unit of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are any
This actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described
There is also other identical elements in the process, method, article or equipment of element.
Feature and performance of the invention are described in further detail with reference to embodiments.
A kind of broadband Larger Dynamic auto-gain circuit, including
Voltage controlled gain amplifying unit, under the adjusting for adjusting voltage, the different input signal of power to be stabilized to function
The identical output signal of rate, and a part of output signal is used to export, another part output signal is for feeding back；
Filter unit, it is narrowed for carrying out the feedback signal of the voltage controlled gain amplifying unit；
Logarithmic amplification unit is demodulated, is demodulated for the feedback signal after being narrowed to the filter unit, and utilizes solution
Feedback signal after tune, which generates, adjusts voltage, output to the voltage controlled gain amplifying unit.
The voltage controlled gain amplifying unit includes two cascade voltage control Amplifiers, described two voltage controlled gain amplifications
Differential low-pass filter is connected between device, the differential low-pass filter is for filtering out harmonic wave.
It further include pre-selection filter unit, for selecting input signal, the pre-selection filter unit is that three ranks are oval
Filter；
Amplify pretreatment unit, for amplifying to the signal of pre-selection filter unit output, and by amplified signal
It is input to the voltage controlled gain amplifying unit, the amplification pretreatment unit is amplifier；
Final stage amplifying unit, the output signal for exporting to the voltage controlled gain amplifying unit amplify, the end
Grade amplifying unit is amplifier；
Final stage filter unit, for being filtered to the amplified output signal of final stage amplifying unit, the final stage filtering
Unit is three rank elliptical low-pass wave structures.
Embodiment
The present embodiment is for being specifically described the present invention.
As shown in Figure 1, the present invention includes pre-selection filter unit, amplification pretreatment unit, voltage controlled gain amplifying unit, filtering
Unit, demodulation logarithmic amplification unit, final stage amplifying unit and final stage filter unit.
The present embodiment frequency input signal is 720MHz ± 150MHz, and power is -90dBm~-10dBm.
As shown in Fig. 2, preselection filter unit selects input signal using three rank elliptic filters, 1dB bandwidth
For 300MHz；Physical circuit is as follows:
Input terminal connects the one end capacitor C1, and the other end of the capacitor C1 connects one end of inductance L1, the inductance L1's
The other end connects the one end capacitor C2 and the one end capacitor C3, one end of the capacitor hair C2 other end connection inductance L2, the inductance
The other end of L2 is grounded, and the capacitor C3 other end connects the one end inductance L3, and the inductance L3 other end connects the one end capacitor C4
With the one end capacitor C5, one end of the capacitor hair C4 other end connection inductance L4, the other end ground connection of the inductance L4, the electricity
Hold the C5 other end and connects the one end inductance L5, described inductance L5 other end connection one end capacitor C6 and the one end capacitor C7, the capacitor
One end of C6 other end connection inductance L6, the other end ground connection of the inductance L6 are sent out, the capacitor C7 other end connects inductance L7
One end, the inductance L7 other end connection amplification pretreatment unit.
Amplify pretreatment unit, is amplified using -90dBm~-10dBm signal of the amplifier to input, it is amplified
Signal power range is -75dBm~5dBm, and the signal within the scope of this is not compressed, and amplified signal enters voltage controlled gain and puts
Big circuit is convenient for stable output power in a numerical value；
As shown in figure 4, voltage controlled gain amplifying unit, is made of, two two-stage voltage control Amplifier ADL5330ACPZ-WP
Harmonic wave is filtered out using differential low-pass filter between grade amplifier, improves the degree of purity of input signal, it is single to output signal to filtering
Member, demodulation logarithmic amplification unit generate tuning voltage Vout, feed back to the tuning voltage pin of two-stage ADL5330 respectively, thus
Make the stable output signal of voltage controlled gain amplifying unit in desired power.Wherein filter unit use centre frequency for
720MHz, bandwidth are the SAW filter of 5MHz, for narrowing the broadband rf signal of feedback, are conducive to demodulation logarithmic amplification list
The demodulation locking of member, demodulation logarithmic amplification unit use AD8318 logafier, can by adjusting its Vset pin voltage
To control the output power of entire voltage controlled gain amplifying unit, by stable output power in -35dBm.
The voltage controlled gain amplifying unit and the specific connection relationship for demodulating logarithmic amplification unit are as follows: the amplification pretreatment
Input of the output of unit as the voltage controlled gain method unit, input terminal connect the first impedance transformer (ETC1-1-13),
First impedance transformer connects the first voltage control Amplifier (ADL5330ACPZ-WP), the first voltage controlled gain amplification
The both ends capacitor C8 of two output ends difference input difference low-pass filter of device (ADL5330ACPZ-WP), the capacitor C8 mono-
One end of end connection inductance L8, the other end of the inductance L8 connect the one end inductance L9, the one end capacitor C9, and the inductance L9 is another
End the connection one end inductance L10, the one end capacitor C10, the capacitor C10 other end connect the one end capacitor C11, and the capacitor C11 is another
One end connects the one end inductance L13, and the inductance L13 other end connects the capacitor C10 other end, the one end inductance L12, the inductance
The L12 other end connects the capacitor C9 other end, the one end inductance L11, and it is another that the inductance L11 other end is connected to the capacitor C8
End, the signal are exported by the both ends capacitor C11, and the signal of the both ends capacitor C11 output is input to the amplification of the second voltage controlled gain
The output end of device (ADL5330ACPZ-WP), second voltage control Amplifier (ADL5330ACPZ-WP) connects the second impedance
Converter (ETC1-1-13), the output signal of second impedance transformer (ETC1-1-13) are fed back for feeding back and exporting
Signal is input to the demodulation logarithmic amplification unit through filter unit, the adjusting voltage input that the demodulation generates counting unit to
First voltage control Amplifier and the second voltage control Amplifier.
The output power of the present embodiment is -20dBm ± 1dBm, therefore type is amplified in the selection of final stage amplifying unit accordingly
Number, amplification factor 20dBm, output is linearly+45dBm, and the output of entire agc circuit is amplified and improved to output signal
Linearly.
As shown in figure 5, final stage filter unit uses three rank ellipse lowpass structures, the harmonic wave for filtering out amplifier is spuious to be made
Output signal is more pure, physical circuit are as follows: input terminal connects one end of capacitor C12 and one end of capacitor C13, the capacitor
The other end of C13 upper shunt inductance L14, the capacitor C12 are grounded, the other end connection capacitor C14 and capacitor of the capacitor C13
The other end of shunt inductance L15 on C15, the capacitor C15, the capacitor C14 are grounded, the other end connection of the capacitor C15
The other end ground connection of shunt inductance L16, the capacitor C16, the capacitor C17 on capacitor C16 and capacitor C17, the capacitor C17
The other end connection output end and capacitor C18 one end, the capacitor C18 the other end ground connection.
The present embodiment use ADL5330ACPZ-WP realize a kind of input frequency for 720MHz ± 150MHz input power be-
90dBm~-10dBm broadband Larger Dynamic automatic gain control circuit.This kind of method is equally applicable to input frequency range and exists
In the design of the Larger Dynamic automatic gain control circuit of 100MHz~2GHz, it can according to need in design to used filter
Wave device, Amplifier Model are adjusted.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of broadband Larger Dynamic auto-gain circuit, it is characterised in that: including
Voltage controlled gain amplifying unit, under the adjusting for adjusting voltage, the different input signal of power to be stabilized to power phase
Same output signal, and a part of output signal is used to export, another part output signal is for feeding back；
Filter unit, it is narrowed for carrying out the feedback signal of the voltage controlled gain amplifying unit；
Logarithmic amplification unit is demodulated, is demodulated for the feedback signal after being narrowed to the filter unit, and after utilization demodulation
Feedback signal generate and adjust voltage, output is to the voltage controlled gain amplifying unit.
2. a kind of broadband Larger Dynamic auto-gain circuit according to claim 1, it is characterised in that: the voltage controlled gain
Amplifying unit includes two cascade voltage control Amplifiers, connects differential low-pass between described two voltage control Amplifiers
Wave device, the differential low-pass filter is for filtering out harmonic wave.
3. a kind of broadband Larger Dynamic auto-gain circuit according to claim 1, it is characterised in that: further include
Filter unit is preselected, for selecting input signal；
Amplify pretreatment unit, for being amplified to the signal of pre-selection filter unit output, and amplified signal is inputted
To the voltage controlled gain amplifying unit；
Final stage amplifying unit, the output signal for exporting to the voltage controlled gain amplifying unit amplify；
Final stage filter unit, for being filtered to the amplified output signal of final stage amplifying unit.
4. a kind of broadband Larger Dynamic auto-gain circuit according to claim 3, it is characterised in that: the pre-selection filtering
Unit is three rank elliptic filters.
5. a kind of broadband Larger Dynamic auto-gain circuit according to claim 3, it is characterised in that: the pre- place of amplification
Reason unit is amplifier.
6. a kind of broadband Larger Dynamic auto-gain circuit according to claim 3, it is characterised in that: the final stage amplification
Unit is amplifier.
7. a kind of broadband Larger Dynamic auto-gain circuit according to claim 3, it is characterised in that: the final stage filtering
Unit is three rank elliptical low-pass wave structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573026.8A CN110289822A (en) | 2019-06-27 | 2019-06-27 | A kind of broadband Larger Dynamic auto-gain circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573026.8A CN110289822A (en) | 2019-06-27 | 2019-06-27 | A kind of broadband Larger Dynamic auto-gain circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110289822A true CN110289822A (en) | 2019-09-27 |
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| CN201910573026.8A Pending CN110289822A (en) | 2019-06-27 | 2019-06-27 | A kind of broadband Larger Dynamic auto-gain circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285387A (en) * | 2021-12-09 | 2022-04-05 | 电子科技大学 | Small LC filter and preparation method thereof |
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|---|---|---|---|---|
| CN1245598A (en) * | 1997-01-27 | 2000-02-23 | 夸尔柯姆股份有限公司 | High dynamic range variable gain amplifier |
| CN203399067U (en) * | 2013-07-29 | 2014-01-15 | 大豪信息技术（威海）有限公司 | Cascade-type AGC system |
| CN204886942U (en) * | 2015-07-17 | 2015-12-16 | 安徽四创电子股份有限公司 | Integration X wave band transceiver module |
| CN108449060A (en) * | 2018-03-22 | 2018-08-24 | 中国电子科技集团公司第二十四研究所 | A kind of fast and stable AGC amplifier |
-
2019
- 2019-06-27 CN CN201910573026.8A patent/CN110289822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245598A (en) * | 1997-01-27 | 2000-02-23 | 夸尔柯姆股份有限公司 | High dynamic range variable gain amplifier |
| CN203399067U (en) * | 2013-07-29 | 2014-01-15 | 大豪信息技术（威海）有限公司 | Cascade-type AGC system |
| CN204886942U (en) * | 2015-07-17 | 2015-12-16 | 安徽四创电子股份有限公司 | Integration X wave band transceiver module |
| CN108449060A (en) * | 2018-03-22 | 2018-08-24 | 中国电子科技集团公司第二十四研究所 | A kind of fast and stable AGC amplifier |
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| 杨剑: "一种高中频宽带AGC设计", 《中国科技信息》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285387A (en) * | 2021-12-09 | 2022-04-05 | 电子科技大学 | Small LC filter and preparation method thereof |
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Application publication date: 20190927 |
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