CN103208972A - Wide-band amplifier circuit with controllable gain and high flatness - Google Patents
Wide-band amplifier circuit with controllable gain and high flatness Download PDFInfo
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- CN103208972A CN103208972A CN2012100092979A CN201210009297A CN103208972A CN 103208972 A CN103208972 A CN 103208972A CN 2012100092979 A CN2012100092979 A CN 2012100092979A CN 201210009297 A CN201210009297 A CN 201210009297A CN 103208972 A CN103208972 A CN 103208972A
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Abstract
The invention relates to a wide-band amplifier circuit with controllable gain and high flatness. The wide-band amplifier circuit comprises an adjustable attenuator (1), an amplifier (2), a coupler (3) and a logarithmic detector (4), wherein the adjustable attenuator (1), the amplifier (2) and the coupler (3) are sequentially connected, and the coupler (3) is connected with the adjustable attenuator (1) through the logarithmic detector (4). Radio frequency signals are sequentially processed by the adjustable attenuator (1) and the amplifier (2) and then enter the coupler (3) which divides the received radio frequency signals into first radio frequency output signals, second radio frequency output signals and feedback signals. By comparing the amplitude of the feedback signals with the amplitude of reference signals, the logarithmic detector (4) outputs a voltage signal to control the attenuation amount of the adjustable attenuator (1), and finally the amplitude of the radio frequency output signals and the amplitude of the reference signals can be kept within a set error range. Compared with the prior art, the wide-band amplifier circuit with the controllable gain and the high flatness has the advantages of being simple in structure, adjustable in gain, high in flatness and the like.
Description
Technical field
The present invention relates to a kind of amplifier circuit, especially relate to a kind of controllable gain high flat degree wide-band amplifier circuit.
Background technology
Along with the development of contemporary wireless technology, the microwave broadband amplifier has become the key components of wireless communication system, and its performance quality will influence the performance of whole communication system.For guaranteeing the matching degree in broadband, mainly adopt feedback technique at present, the travelling-wave-type technology, Technology design wide-band amplifiers such as balanced type technology, but the power gain of these amplifiers can not be adjusted, be not suitable for some required power gain adjustable system, and also has the other problem, need the tube core number more as the travelling-wave-type circuit, processed complex, and power loss is big, and the feedback resistance in the negative-feedback circuit can cause noise factor to worsen, and the port standing-wave ratio of amplifier is difficult to guarantee, biasing circuit designs also more complicated, neutrodyne circuit needs transistor size many, and size is bigger, and bandwidth is subjected to the frequency band limits of power splitter in addition.
Though now some device manufacturer provides the wide-band amplifier of adjustable gain, but exist price height, frequency range limited, need single chip circuit to carry out shortcomings such as program control.
Summary of the invention
Purpose of the present invention is exactly that a kind of simple in structure, gain is adjustable, flatness is high, cost is low controllable gain high flat degree wide-band amplifier circuit is provided in order to overcome the defective that above-mentioned prior art exists.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of controllable gain high flat degree wide-band amplifier circuit, it is characterized in that, comprise adjustable attenuator, amplifier, coupler and logarithmic detector, described adjustable attenuator, amplifier, coupler connect successively, and described coupler is connected with adjustable attenuator by logarithmic detector;
Radiofrequency signal enters coupler through adjustable attenuator, amplifier after handling successively, coupler is divided into the first radio frequency output signal, the second radio frequency output signal and feedback signal three road signals with the radiofrequency signal that receives, logarithmic detector is by comparing the amplitude size of feedback signal and reference signal, export the attenuation that a voltage signal is used for controlling adjustable attenuator, finally make radio frequency output signal and reference signal amplitude remain in the error range of setting.
The output of described logarithmic detector is specific as follows: if the amplitude of feedback signal is higher than the amplitude of reference signal, then logarithmic detector is exported a big voltage signal, increases the attenuation of adjustable attenuator; If the amplitude of feedback signal is lower than the amplitude of reference signal, then logarithmic detector is exported a small voltage signal, reduces the attenuation of adjustable attenuator.
Compared with prior art, the present invention has the following advantages:
1) entire circuit is only used an amplifier, does not have complicated peripheral match circuit, is easy to miniaturization and Project Realization;
2) select suitable logarithmic detector for use, the gain flatness of entire circuit can be controlled in a desirable scope;
3) by different reference signal values is set, can adjust the power gain value of entire circuit;
4) adjustable attenuator uses analog circuit to carry out voltage control, does not use Single-chip Controlling, does not need to write the voltage control program, saves cost.
Description of drawings
Fig. 1 is the structural representation of this controllable gain high flat degree wide-band amplifier circuit.
A is radiofrequency signal among the figure, and B is reference signal, and C is voltage signal, and D is feedback signal, and E is the first radio frequency output signal, and F is the second radio frequency output signal.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, this amplifier circuit comprises adjustable attenuator 1, amplifier 2, coupler 3 and logarithmic detector 4, and wherein, adjustable attenuator 1, amplifier 2, coupler 3 connect successively, and coupler 3 is connected with adjustable attenuator 1 by logarithmic detector 4;
The operation principle of this circuit is as follows: when radiofrequency signal enters this circuit unit, at first carry out attenuation processing through adjustable attenuator 1, the purpose of doing like this is to guarantee that amplifier 2 can be operated in the range of linearity, and can make the interior gain flatness of design frequency band in claimed range, radiofrequency signal after overdamping is amplified into coupler 3 through amplifier 2, coupler 3 is divided into the first radio frequency output signal with the radiofrequency signal that receives, the second radio frequency output signal and feedback signal three road signals, 4 amplitude sizes of passing through to compare feedback signal and reference signal of logarithmic detector, export the attenuation that a voltage signal is used for controlling adjustable attenuator 1, finally make radio frequency output signal and reference signal amplitude remain in the error range of setting.
Wherein, following principle is deferred in choosing of voltage signal: if the amplitude of feedback signal is higher than the amplitude of reference signal, then logarithmic detector 4 is exported a big voltage signal, increases the attenuation of adjustable attenuator 1; If the amplitude of feedback signal is lower than the amplitude of reference signal, then logarithmic detector 4 is exported a little voltage signal, reduces the attenuation of adjustable attenuator 1.
Entire circuit is only used an amplifier, does not have complicated peripheral match circuit, is easy to miniaturization and Project Realization; By selecting suitable logarithmic detector for use, the gain flatness of entire circuit can be controlled in a desirable scope; By different reference signals is set, can adjust the power gain value of entire circuit; Adjustable attenuator uses analog circuit to carry out voltage control, does not use Single-chip Controlling, does not need to write the voltage control program, provides cost savings.
Claims (2)
1. controllable gain high flat degree wide-band amplifier circuit, it is characterized in that, comprise adjustable attenuator (1), amplifier (2), coupler (3) and logarithmic detector (4), described adjustable attenuator (1), amplifier (2), coupler (3) connect successively, and described coupler (3) is connected with adjustable attenuator (1) by logarithmic detector (4);
Radiofrequency signal enters coupler (3) through adjustable attenuator (1), amplifier (2) after handling successively, coupler (3) is divided into the first radio frequency output signal, the second radio frequency output signal and feedback signal three road signals with the radiofrequency signal that receives, logarithmic detector (4) is by comparing the amplitude size of feedback signal and reference signal, export the attenuation that a voltage signal is used for controlling adjustable attenuator (1), finally make radio frequency output signal and reference signal amplitude remain in the error range of setting.
2. a kind of controllable gain high flat degree wide-band amplifier circuit according to claim 1, it is characterized in that, the output of described logarithmic detector (4) is specific as follows: if the amplitude of feedback signal is higher than the amplitude of reference signal, then big voltage signal of logarithmic detector (4) output increases the attenuation of adjustable attenuator (1); If the amplitude of feedback signal is lower than the amplitude of reference signal, then logarithmic detector (4) is exported a small voltage signal, reduces the attenuation of adjustable attenuator (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100092979A CN103208972A (en) | 2012-01-12 | 2012-01-12 | Wide-band amplifier circuit with controllable gain and high flatness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100092979A CN103208972A (en) | 2012-01-12 | 2012-01-12 | Wide-band amplifier circuit with controllable gain and high flatness |
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| CN103208972A true CN103208972A (en) | 2013-07-17 |
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| CN2012100092979A Pending CN103208972A (en) | 2012-01-12 | 2012-01-12 | Wide-band amplifier circuit with controllable gain and high flatness |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135299A (en) * | 2014-07-18 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Two-channel two-stage variable frequency broadband receiver and automatic gain control method thereof |
| CN104410393A (en) * | 2014-11-05 | 2015-03-11 | 西安博瑞集信电子科技有限公司 | High-speed and high-frequency modulator circuit and method |
| CN105634428A (en) * | 2015-12-31 | 2016-06-01 | 中国石油天然气集团公司 | Automatic gain control system and control method for AGC (Automatic Gain Control) loop |
| CN106936391A (en) * | 2017-04-26 | 2017-07-07 | 成都联帮微波通信工程有限公司 | A kind of amplifier module of broadband high flat degree |
| CN108923796A (en) * | 2018-06-08 | 2018-11-30 | 中国电子科技集团公司第四十研究所 | A kind of pre- fixed ampllitude dynamic regulation circuit in broadband and adjusting method |
| CN109525210A (en) * | 2018-11-07 | 2019-03-26 | 中电科仪器仪表有限公司 | Power amplifying system, method and application |
| CN114285483A (en) * | 2021-12-08 | 2022-04-05 | 北京无线电计量测试研究所 | Microwave signal amplitude control system |
| CN114337601A (en) * | 2022-03-15 | 2022-04-12 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband microwave signal generator |
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| US6731915B1 (en) * | 2000-10-31 | 2004-05-04 | Nokia Corporation | Combined RF power detector and power precorrector |
| CN201307848Y (en) * | 2008-12-09 | 2009-09-09 | 江扬科技(无锡)有限公司 | Radio frequency automatic level control circuit |
| CN201590806U (en) * | 2010-01-13 | 2010-09-22 | 中国电子科技集团公司第五十四研究所 | Silicon carbide wide band high-power amplifier device |
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Patent Citations (3)
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| US6731915B1 (en) * | 2000-10-31 | 2004-05-04 | Nokia Corporation | Combined RF power detector and power precorrector |
| CN201307848Y (en) * | 2008-12-09 | 2009-09-09 | 江扬科技(无锡)有限公司 | Radio frequency automatic level control circuit |
| CN201590806U (en) * | 2010-01-13 | 2010-09-22 | 中国电子科技集团公司第五十四研究所 | Silicon carbide wide band high-power amplifier device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135299A (en) * | 2014-07-18 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Two-channel two-stage variable frequency broadband receiver and automatic gain control method thereof |
| CN104410393A (en) * | 2014-11-05 | 2015-03-11 | 西安博瑞集信电子科技有限公司 | High-speed and high-frequency modulator circuit and method |
| CN104410393B (en) * | 2014-11-05 | 2023-06-16 | 西安博瑞集信电子科技有限公司 | High-speed high-frequency modulator circuit and method |
| CN105634428A (en) * | 2015-12-31 | 2016-06-01 | 中国石油天然气集团公司 | Automatic gain control system and control method for AGC (Automatic Gain Control) loop |
| CN106936391A (en) * | 2017-04-26 | 2017-07-07 | 成都联帮微波通信工程有限公司 | A kind of amplifier module of broadband high flat degree |
| CN106936391B (en) * | 2017-04-26 | 2023-07-21 | 成都联帮微波通信工程有限公司 | Broadband high-flatness amplifying assembly |
| CN108923796A (en) * | 2018-06-08 | 2018-11-30 | 中国电子科技集团公司第四十研究所 | A kind of pre- fixed ampllitude dynamic regulation circuit in broadband and adjusting method |
| CN109525210A (en) * | 2018-11-07 | 2019-03-26 | 中电科仪器仪表有限公司 | Power amplifying system, method and application |
| CN114285483A (en) * | 2021-12-08 | 2022-04-05 | 北京无线电计量测试研究所 | Microwave signal amplitude control system |
| CN114337601A (en) * | 2022-03-15 | 2022-04-12 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband microwave signal generator |
| CN114337601B (en) * | 2022-03-15 | 2022-05-24 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband microwave signal generator |
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Application publication date: 20130717 |