CN204046522U - Wide band logarithmic amplifier - Google Patents
Wide band logarithmic amplifier Download PDFInfo
- Publication number
- CN204046522U CN204046522U CN201420342713.1U CN201420342713U CN204046522U CN 204046522 U CN204046522 U CN 204046522U CN 201420342713 U CN201420342713 U CN 201420342713U CN 204046522 U CN204046522 U CN 204046522U
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- amplifier
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Abstract
The utility model is wide band logarithmic amplifier, and the logarithmic amplifier gain that solving oneself has is fixed, and log slope is fixed, the opposite band width be suitable for, and effectively can not adapt to the problem of various receiver to the actual demand of gain and log slope.The output of input offset attenuator (1) is connected with the input of logarithmic detector amplifying circuit (2), logarithmic detector amplifying circuit (2) is connected with amplitude limit current generating circuit (3), the output of logarithmic detector amplifying circuit (2) is connected with the input exporting compensate for attenuation circuit (4), and the output exporting compensate for attenuation circuit (4) is connected with the input of signal output amplifier (5).
Description
technical field:
The utility model is relevant with logarithmic amplifier.
background technology:
Modern communication system is along with the expansion of communication distance, consider and only take into account while distance communication and telecommunication, the instantaneous dynamic range needed is increasing, and the instantaneous of now general digital sample chip (AD) effectively dynamically only has 60dB, the requirement of Current communications system to transient behavior can not be met.
And current common logarithmic amplifier gain is fixed, log slope is fixed, the opposite band width be suitable for, and effectively can not adapt to the actual demand of various receiver to gain and log slope.
utility model content:
The purpose of this utility model is to provide one can realize dynamic range greatly, and the response time is little, and volume is little, low in energy consumption, and gain and log slope are by simply debugging the wide band logarithmic amplifier carrying out according to the actual requirements regulating and controlling.
Of the present utility modelly to be achieved in that
Wide band logarithmic amplifier, the output of input offset attenuator 1 is connected with the input of logarithmic detector amplifying circuit 2, logarithmic detector amplifying circuit 2 is connected with amplitude limit current generating circuit 3, the output of logarithmic detector amplifying circuit 2 is connected with the input exporting compensate for attenuation circuit 4, and the output exporting compensate for attenuation circuit 4 is connected with the input of signal output amplifier 5.
Wide band logarithmic amplifier forms by primarily of logarithmic detector amplifying circuit 2, amplitude limit current generating circuit 3, signal output amplifier 5, and the function of various piece is as follows:
A) logarithmic detector amplifying circuit 2 one aspect provides the logarithmic detector voltage of input signal for amplitude limit current generating circuit 3, receives the gain that amplitude limit current generating circuit 3 provides on the one hand and controls electric current to adjust current loop gain.
B) amplitude limit current generating circuit 3 is mainly logarithmic detector amplifying circuit 2 provides gain to control electric current, and can according to the log slope needing regulator control system of current system.
D) signal output amplifier 5 is mainly used in amplifying the signal after log-compressed, for late-class circuit provides the suitable signal level of drive, can need to adjust output signal power according to system.
The attainable beneficial effect of the utility model.
Wide band logarithmic amplifier is by logarithmic detector amplifying circuit 2, detecting circuit is carried out quick winding by amplitude limit current generating circuit 3 and is converted into current signal, linearly log-compressed is realized by the gain of current signal control loop, realize the great dynamic range fast linear log-compressed of intermediate-freuqncy signal, reach the object improving Dynamic Range.-40 DEG C ~+70 DEG C temperature ranges, input power-70dBm ~+10dBm dynamic range, test under experimental condition in frequency 50MHz ~ 300MHz frequency range, can realize the dynamic range of 80dB, the response time is less than 150ns, and volume is little, low in energy consumption, achieving and the IF input signals of 80dB dynamic range compression 20dB dynamic range is exported, the dynamic range of current system can be expanded greatly, and gain and log slope regulating and controlling according to the actual requirements by simply debugging.
accompanying drawing illustrates:
Fig. 1 is the utility model block diagram.
Fig. 2 is the utility model circuit theory diagrams.
embodiment:
Embodiment:
Wide band logarithmic amplifier, the output of input offset attenuator 1 is connected with the input of logarithmic detector amplifying circuit 2, logarithmic detector amplifying circuit 2 is connected with amplitude limit current generating circuit 3, the output of logarithmic detector amplifying circuit 2 is connected with the input exporting compensate for attenuation circuit 4, and the output exporting compensate for attenuation circuit 4 is connected with the input of signal output amplifier 5.
Input offset attenuator 1 is made up of R6, R8, R9, logarithmic detector amplifying circuit 2 is made up of C11, R10, C15, U2, R5, R11, C3, C4, L1, C17, R1, R3, C1, C7, amplitude limit current generating circuit 3 is made up of R17, C16, R15, R14, R16, R20, U3B, R13, R19, R22, R23, U3A, R21, VT1, export compensate for attenuation circuit 4 to be made up of C8, C14, R4, R7, signal output amplifier 5 is made up of C9, U1, R2, C2, L2, C10.
Input signal passes through R6, R8, after the π type resistance attenuation circuit of R9 composition, enter U2 logarithmic amplifier chip, from the amplitude detection voltage of U2-16 pin output signal after chip internal carries out amplitude detection to signal, the high speed operation amplifier that this voltage is represented by U3B carries out in-phase proportion amplification, the bleeder circuit formed through resistance R19, R22, R23 afterwards obtains final limiting voltage, the On current of this limiting voltage control VT1 triode after the operational amplifier that U3A indicates drives.The collector voltage of triode VT1 is provided by 9 pin of U2 chip, and the electric current being adjusted 9 pin flowing out U2 chip by triode VT1 adjusts the gain of U2 chip.Such formation feedback loop, when input signal power is less, the electric current flowing out 9 pin of U2 chip is less, and the gain of U2 chip is larger; When input signal power is larger, the electric current flowing out 9 pin of U2 chip is larger, and the gain of U2 chip is less.By simply adjusting the resistance value of R13, the log gain change slope of chip U2 just can be adjusted.Owing to have employed operational amplifier at a high speed in conjunction with simple transistor circuit, the response time of feedback loop can be less than 150ns.The dynamic range of this device depends mainly on the input voltage detection dynamic range that U2 chip provides, and this dynamic range can more than 90dB, and under the reliable prerequisite used, this device can realize the linear dynamic more than 80dB.
After 13 pin outputs of U2 chip, given the linear amplifier circuit of U1 chip composition by the signal after logarithmic amplification, export the signal of appropriate power.The linear amplifier circuit of U1 chip composition adjusts chip gain, with adaptive system demand by resistance R4 and R2.
Table 1 is logarithmic amplifier device detail list:
Table 1 logarithmic amplifying circuit components and parts table
Claims (1)
1. wide band logarithmic amplifier, it is characterized in that the output of input offset attenuator (1) is connected with the input of logarithmic detector amplifying circuit (2), logarithmic detector amplifying circuit (2) is connected with amplitude limit current generating circuit (3), the output of logarithmic detector amplifying circuit (2) is connected with the input exporting compensate for attenuation circuit (4), and the output exporting compensate for attenuation circuit (4) is connected with the input of signal output amplifier (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342713.1U CN204046522U (en) | 2014-06-25 | 2014-06-25 | Wide band logarithmic amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342713.1U CN204046522U (en) | 2014-06-25 | 2014-06-25 | Wide band logarithmic amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204046522U true CN204046522U (en) | 2014-12-24 |
Family
ID=52247143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420342713.1U Expired - Fee Related CN204046522U (en) | 2014-06-25 | 2014-06-25 | Wide band logarithmic amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204046522U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730547A (en) * | 2015-03-25 | 2015-06-24 | 天津七六四通信导航技术有限公司 | Logarithmic amplifying circuit applied to receiver of Tacan ground device |
| CN108306621A (en) * | 2018-03-06 | 2018-07-20 | 中国电子科技集团公司第二十四研究所 | High-frequency low-power consumption true logarithmic amplifier |
| CN109525334A (en) * | 2018-12-19 | 2019-03-26 | 南京米乐为微电子科技有限公司 | A kind of wideband logarithmic detector of high dynamic range |
-
2014
- 2014-06-25 CN CN201420342713.1U patent/CN204046522U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730547A (en) * | 2015-03-25 | 2015-06-24 | 天津七六四通信导航技术有限公司 | Logarithmic amplifying circuit applied to receiver of Tacan ground device |
| CN104730547B (en) * | 2015-03-25 | 2017-06-09 | 天津七六四通信导航技术有限公司 | It is applied to the logarithmic amplifying circuit of Tacan ground installation receiver |
| CN108306621A (en) * | 2018-03-06 | 2018-07-20 | 中国电子科技集团公司第二十四研究所 | High-frequency low-power consumption true logarithmic amplifier |
| CN109525334A (en) * | 2018-12-19 | 2019-03-26 | 南京米乐为微电子科技有限公司 | A kind of wideband logarithmic detector of high dynamic range |
| CN109525334B (en) * | 2018-12-19 | 2023-10-13 | 南京米乐为微电子科技有限公司 | Broadband logarithmic detector with high dynamic range |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 Termination date: 20160625 |