CN205961101U - A radio frequency receiver - Google Patents
A radio frequency receiver Download PDFInfo
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- CN205961101U CN205961101U CN201620841051.1U CN201620841051U CN205961101U CN 205961101 U CN205961101 U CN 205961101U CN 201620841051 U CN201620841051 U CN 201620841051U CN 205961101 U CN205961101 U CN 205961101U
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- frequency
- radio
- amplifier
- filter
- circuit
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- Superheterodyne Receivers (AREA)
Abstract
The utility model relates to the field of communication technology, a a radio frequency receiver is disclosed, including front -end amplifying circuit, first detector, IF amplifier circuit, demodulation circuit and the digital sampling circuit who connects gradually to reach the local oscillator who is connected with the first detector, front -end amplifying circuit 's input is connected with receive port. The utility model discloses an aspect has very high sensitivity and precision, and on the other hand also has good selectivity, can restrain very strong interfering signal.
Description
Technical field
This utility model is related to communication technical field, more specifically, particularly to a kind of test for test instrunment
The radio-frequency transmitter of port.
Background technology
At present multi-standard to be supported, multifrequency point, full frequency band mostly in communication equipment.So having to design a being suitable for
Base station demand include GSM WCDMA CDMA the receiver meeting uplink receiving frequency range including the base station such as DCS.Due to receiving frequency
Rate is higher, and it is necessary to adopt high frequency amplifier, the gain of high frequency amplifier is low, if by the way of directly amplifying signal, will
Occur that receiver sensitivity is low, poor selectivity, the defect such as receiver structure complexity.
For above-mentioned irrational mentality of designing it is impossible to meet the test needs of the signal of the uplink band of communication base station,
It is therefore necessary to designing a kind of radio-frequency transmitter.This reception mode can be widely used for the reception of remote signal, is adapted to high frequency
Rate, the reception of weak signal need.The frequency of one fixation can be amplified, be readily available larger and stable times magnification
Number, thus improve the stability of receiver.
Utility model content
The purpose of this utility model is to provide the radio-frequency transmitter of a kind of sensitivity and high precision.
In order to achieve the above object, the technical solution adopted in the utility model is as follows：
A kind of radio-frequency transmitter, including the frontend amplifying circuit being sequentially connected, frequency mixer, IF amplifier circuit, demodulation electricity
Road and digital sampling circuitry, and the local oscillator being connected with frequency mixer, the input of described frontend amplifying circuit is connected with
Receiving port.
Further, described frontend amplifying circuit includes the first order low-noise amplifier being sequentially connected and second level buffering
Amplifier, the input of described first order low-noise amplifier is connected with receiving port, described second level buffer amplifier defeated
Go out end to be connected with the input of frequency mixer.
Further, described IF amplifier circuit includes first order intermediate-frequency filter, the gain control amplification being sequentially connected
Circuit and second level intermediate-frequency filter, the described input of first order intermediate-frequency filter is connected with the outfan of frequency mixer, described
The outfan of second level intermediate-frequency filter is connected with the input of demodulator circuit.
Further, described first order low-noise amplifier is LNA low noise amplifier, and described second level buffer amplifier is adopted
Use PW410 buffer amplifier.
Further, described first order intermediate-frequency filter and second level intermediate-frequency filter are all using 15MHz crystal filter.
Further, described demodulator circuit adopts the demodulation chip of model AD8310.
Further, described digital sampling circuitry is single-chip microcomputer.
Compared with prior art, the utility model has the advantage of：This utility model one side has very high sensitivity
And precision, on the other hand also there is good selectivity, very strong interference signal can be suppressed.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise not paying creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the theory diagram of radio-frequency transmitter described in the utility model.
Fig. 2 is the circuit diagram of first order low-noise amplifier in radio-frequency transmitter described in the utility model.
Fig. 3 is the circuit diagram of frequency mixer in radio-frequency transmitter described in the utility model.
Fig. 4 is the circuit diagram of IF amplifier circuit in radio-frequency transmitter described in the utility model.
Fig. 5 is the circuit diagram of demodulator circuit in radio-frequency transmitter described in the utility model.
Description of reference numerals：1st, frontend amplifying circuit, 2, IF amplifier circuit, 101, first order low-noise amplifier,
201st, second level buffer amplifier, 301, frequency mixer, 302, local oscillator, 401, first order intermediate-frequency filter, 501, gain
Control amplifying circuit, 601, second level intermediate-frequency filter, 701, demodulator circuit, 801, digital sampling circuitry.
Specific embodiment
Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model
Can be easier to be readily appreciated by one skilled in the art with feature, thus make apparent clear and definite to protection domain of the present utility model
Define.
Refering to shown in Fig. 1-Fig. 3, this utility model provides a kind of radio-frequency transmitter, amplifies electricity including the front end being sequentially connected
Road 1, frequency mixer 301, IF amplifier circuit 2, demodulator circuit 701 and digital sampling circuitry 801, and be connected with frequency mixer 301
Local oscillator 302, the input of described frontend amplifying circuit 1 is connected with receiving port.
Described frontend amplifying circuit 1 includes the first order low-noise amplifier 101 being sequentially connected and second level Hyblid Buffer Amplifier
Device 201, the input of described first order low-noise amplifier 101 is connected with receiving port, described second level buffer amplifier 201
Outfan be connected with the input of frequency mixer 301.
Refering to shown in Fig. 2, described first order low-noise amplifier 101 is LNA low noise amplifier, before reception system
End, suppresses noise jamming while amplifying weak signal, improves system sensitivity.Low noise amplifier has very low noise system
Number and very wide frequency range, when signal is weaker, the weak signal of system output must first pass through low-noise amplifier and amplify, then
Deliver to receiver system.
Described second level buffer amplifier 201 adopts PW410 buffer amplifier, is the low one-tenth of a high-performance, high-gain
This amplifier, range frequencies DC-3G, gain during 900MHz can reach 20dB.
Described IF amplifier circuit 2 includes first order intermediate-frequency filter 401, the gain control amplifying circuit being sequentially connected
501 and second level intermediate-frequency filter 601, the outfan of the input of described first order intermediate-frequency filter 401 and frequency mixer 301 is even
Connect, the outfan of described second level intermediate-frequency filter 601 is connected with the input of demodulator circuit 701.
Refering to shown in Fig. 3, described frequency mixer 301, because radio-frequency transmitter of the present utility model adopts super heterodyne architectures,
So frequency conversion (being transformed into relatively low intermediate frequency 15MHz from high-frequency input signal), need input signal fCWith from reception
The local oscillation signal F of machineLRealize mixing.Mixing intermediate-freuqncy signal f outI=FL±fC.The local oscillated signal of receiver is that have
10M reference source crystal oscillator provides input signal, and by Single-chip Controlling, the high-frequency oscillation signal exporting a frequency stable is (local
The oscillator signal radio frequency signal frequency difference 15MHz with receiver input all the time).
Refering to shown in Fig. 4, described IF amplifier circuit 2, is that intermediate-freuqncy signal out is filtered through first order intermediate frequency mixing
Ripple device 401, refers to filter through 15MHz crystal filter, then carries out gain amplification through gain control amplifying circuit 501,
Filter through second level intermediate-frequency filter 601 (15MHz crystal filter) more afterwards.It is the vitals in receiver, it
Prime connects mixting circuit, and rear class connects demodulator circuit, is important bridge middle between the two, thus can set up between two frequency ranges
Signal conversion and impedance matching, thus ensure that selectivity and the machine sensitivity of receiver.
Refering to shown in Fig. 5, described demodulator circuit 701, use a super fast response, multistage demodulating logarithmic amplifier.
AD8310 is the choosing of the higher ideal of accurate intermediate-freuqncy signal measurement application of requirement, and this logafier passes through with dB equivalents
Detect and compress intermediate-freuqncy signal, make measurement work free and relaxed.AD8310 has the 15ns response time being exceedingly fast, and can detect
The ASK modulation waveform of more than 10MHz.Its slope is+24mV/dB, and dynamic range can reach 0～-70dB.
Further, described digital sampling circuitry 801 is single-chip microcomputer, belongs to digital processing part, is demodulation out
DC voltage is processed through single-chip microcomputer, is uploaded to test system, can carry out the receiving power calibration of receiver.
By design of the present utility model, on the one hand it have very high sensitivity and precision, on the other hand also has good
Good selectivity, can suppress very strong interference signal.
Although being described in conjunction with the accompanying embodiment of the present utility model, patent owner can want in appended right
Various modifications or modification is made, as long as less than the protection model described by claim of the present utility model within the scope of asking
Enclose, all should be within protection domain of the present utility model.
Claims (7)
1. a kind of radio-frequency transmitter it is characterised in that：Amplify electricity including the frontend amplifying circuit being sequentially connected, frequency mixer, intermediate frequency
Road, demodulator circuit and digital sampling circuitry, and the local oscillator being connected with frequency mixer, the input of described frontend amplifying circuit
End is connected with receiving port.
2. radio-frequency transmitter according to claim 1 it is characterised in that：Described frontend amplifying circuit includes being sequentially connected
First order low-noise amplifier and second level buffer amplifier, the input of described first order low-noise amplifier and receiving port
Connect, the outfan of described second level buffer amplifier is connected with the input of frequency mixer.
3. radio-frequency transmitter according to claim 1 it is characterised in that：Described IF amplifier circuit includes being sequentially connected
First order intermediate-frequency filter, gain control amplifying circuit and second level intermediate-frequency filter, described first order intermediate-frequency filter defeated
Enter end to be connected with the outfan of frequency mixer, the outfan of described second level intermediate-frequency filter is connected with the input of demodulator circuit.
4. radio-frequency transmitter according to claim 2 it is characterised in that：Described first order low-noise amplifier is that LNA is low
Make an uproar amplifier, described second level buffer amplifier adopts PW410 buffer amplifier.
5. radio-frequency transmitter according to claim 3 it is characterised in that：In described first order intermediate-frequency filter and the second level
Frequency wave filter is all using 15MHz crystal filter.
6. radio-frequency transmitter according to claim 1 it is characterised in that：Described demodulator circuit adopts model AD8310
Demodulation chip.
7. radio-frequency transmitter according to claim 1 it is characterised in that：Described digital sampling circuitry is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620841051.1U CN205961101U (en) | 2016-08-04 | 2016-08-04 | A radio frequency receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620841051.1U CN205961101U (en) | 2016-08-04 | 2016-08-04 | A radio frequency receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205961101U true CN205961101U (en) | 2017-02-15 |
Family
ID=57973585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620841051.1U Active CN205961101U (en) | 2016-08-04 | 2016-08-04 | A radio frequency receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205961101U (en) |
-
2016
- 2016-08-04 CN CN201620841051.1U patent/CN205961101U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210521 Address after: 211100 1 Dongji Avenue, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Patentee after: NANJING HUALUO COMMUNICATION TECHNOLOGY Co.,Ltd. Address before: No.155-1, zhongpailou East, Qinhuai District, Nanjing City, Jiangsu Province, 210022 Patentee before: NANJING RFLIGHT COMMUNICATION ELECTRONIC Corp. |
|
| TR01 | Transfer of patent right |