CN206559337U - A kind of very high frequency(VHF) FM receiver - Google Patents
A kind of very high frequency(VHF) FM receiver Download PDFInfo
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- CN206559337U CN206559337U CN201720280296.6U CN201720280296U CN206559337U CN 206559337 U CN206559337 U CN 206559337U CN 201720280296 U CN201720280296 U CN 201720280296U CN 206559337 U CN206559337 U CN 206559337U
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- frequency
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- vhf
- amplifier
- audio
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Abstract
The utility model is related to a kind of very high frequency(VHF)（VHF）FM receiver, it is made up of functional modules such as antenna, input signal conditioning module, frequency mixing module, frequency discriminator block, audio signal output modules.The function of the system be realize it is a kind of portable, it is possible to achieve very high frequency(VHF)（VHF）The receiver that wave band FM signal is received.The system mainly has the advantage that：（1）Small volume, is easy to carry；（2）Circuit is simple, and power consumption is low, function admirable；（3）Cost is low, cheap；（4）Power module has standby selection, applied widely.
Description
Technical field
The utility model is related to a kind of receiver, is primarily referred to as a kind of very high frequency(VHF)（VHF）FM receiver.
Background technology
Very high frequency(VHF)（Very high frequency, VHF）, refer to 30MHz-300MHz radiobeam frequency range.Than
VHF frequencies it is lower slightly be high frequency（High frequency, HF）, more slightly higher than VHF frequency is superfrequency（Ultra high
Frequency, UHF）.Compared with HF frequency ranges, VHF frequency range passbands are wider, steady signal transmission, have preferable signal to noise ratio and
Higher efficiency, is widely used in the communication of radio broadcasting, TV station/radio station and ham radio, while being again
The communications band of aviation/navigation, and substantial amounts of emergency communication equipment is all deployed in the frequency range, with very high academic research with
Development volue.But be due to that the present most volume of very high frequency(VHF) VHF band receivers is big, cost is high, inconvenient carrying and reception.
Therefore designing and Implementing a kind of low cost, high-performance, the receiver of portable very high frequency(VHF) VHF wave bands has important reality
Meaning.
Utility model content
The purpose of this utility model is to overcome weak point of the prior art that there is provided a kind of small volume, cost are low
Very high frequency(VHF)（VHF）FM receiver.
The utility model adopts the following technical scheme that realization：
A kind of very high frequency(VHF) FM receiver, including antenna, input signal conditioning module, frequency mixing module, the mirror being sequentially connected
Frequency module, audio signal output module；The input signal conditioning module includes radio frequency band filter, low-noise amplifier；
The frequency mixing module includes voltage controlled oscillator, Type Multiplicative frequency mixer, ceramic filter；The frequency discriminator block is amplified including intermediate frequency
Device, quadrature detector；The audio signal output module includes active low-pass filter, audio-frequency power amplifier；Penetrate
Band-pass filter, low-noise amplifier, Type Multiplicative frequency mixer, ceramic filter, intermediate frequency amplifier, Type Multiplicative phase frequency discrimination
Device, active low-pass filter, audio-frequency power amplifier are sequentially connected, and voltage controlled oscillator is connected with Type Multiplicative frequency mixer.
The complete twin aerial of input signal conditioning module receives the filtering and amplification of signal；Radio frequency bandpass filtering therein
Device uses five rank Butterworth passive bandpass filters, to obtain flat passband；Low-noise amplifier selects JRC companies wideband
Low-noise amplifier NJG1146KG1, the tiny signal received is amplified.
The frequency mixing module completes the frequency spectrum shift of signal；Voltage controlled oscillator therein uses the MAX2606 of Maxim companies
Chip, obtains 98 ~ 120MHz local oscillation signal；Type Multiplicative frequency mixer use ADI companies AD8342 chips, by local oscillation signal with
10.7MHz intermediate-freuqncy signal is obtained after the output signal progress mixing operation of input signal conditioning module；Ceramic filter is adopted
With the SFECK10M7JA00S0 ceramic filters of Murata, enable the 10.7MHz intermediate-freuqncy signals that upper level is exported by and
Suppress other frequency signals to pass through.
The frequency discriminator block completes the demodulation of FM signal, exports 20Hz-20KHz audio signal；Intermediate frequency therein is put
Big device uses the AD8367 chips of ADI companies, and signal is further amplified；Quadrature detector JRC companies
NJM14570 chips complete the demodulation of FM signal；NJM14570 chip RSSI indication signals are fed back in controllable gain simultaneously
Audio amplifier AD8367, realizes automatic growth control to obtain good stability.
The audio signal output module realizes the output of audio signal, promotes loudspeaker sounding；Active low pass therein
Wave filter uses the operational amplifier OPA350 of TI companies, filters out the high-frequency noise in audio signal；Audio-frequency power amplifier is adopted
With the SSM2305 chips of ADI companies, audio signal is further amplified to reach earphone output requirement, finally by audio signal
It is conveyed to earphone or loudspeaker.
The antenna is usedTelescopic antenna.
Compared with prior art, the utility model has advantages below：（1）Small volume, is easy to carry；（2）Circuit is simple,
Power consumption is low, function admirable；（3）Cost is low, cheap；（4）Power module has standby selection, applied widely.
Brief description of the drawings
Fig. 1 is circuit module block diagram of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail：
As shown in figure 1, the very high frequency(VHF) of the utility model design（VHF）FM receiver is main to be adjusted by antenna, input signal
The functional modules such as module, frequency mixing module, frequency discriminator block, audio signal output module are managed to constitute.
Superheterodyne receiver design form is taken in the design of the receiver.Input signal conditioning module is by radio frequency bandpass filtering
Device and low-noise amplifier composition, complete twin aerial receive the filtering and amplification of signal.Frequency mixing module is by voltage controlled oscillator, mixing
Device and ceramic filter composition, complete the frequency spectrum shift of signal, 100MHz or so FM signal are moved in 10.7MHz
On frequency, it is easy to subsequent conditioning circuit to handle 10.7MHz intermediate-freuqncy signals, reduces the difficulty of circuit design.Frequency discriminator block is by intermediate frequency
Amplifier, quadrature detector composition, complete the demodulation of FM signal, export 20Hz-20KHz audio signal.Audio
Signal output module is made up of active low-pass filter and audio-frequency power amplifier, realizes the output of audio signal, and promotion is raised one's voice
Device sounding.
Radio frequency band filter uses five rank Butterworth passive bandpass filters, centre frequency 97.5MHz, passband
20MHz, makes 88 ~ 108MHz signal by passing through while suppressing other frequency signals.Low-noise amplifier is wide from JRC companies
Frequency low-noise amplifier NJG1146KG1, the tiny signal received is amplified, so that subsequent conditioning circuit is handled.It is voltage-controlled
Oscillator uses the MAX2606 chips of Maxim companies, and 98 ~ 120MHz local oscillation signal is obtained by periphery configuration inductance.Mixing
Device uses the AD8342 chips of ADI companies, and the output signal of local oscillation signal and input signal conditioning module is carried out into mixing operation
10.7MHz intermediate-freuqncy signal is obtained afterwards, and intermediate-frequency filter uses Murata（Village field）The SFECK10M7JA00S0 ceramics of company
Wave filter, enable frequency mixer export 10.7MHz intermediate-freuqncy signals by and suppress other frequency signals and pass through.Intermediate frequency amplifier
Using the AD8367 chips of ADI companies, signal is further amplified, while AD8367 also has linear gain control function.Multiply
Product type phase-shift discriminator uses the NJM14570 chips of JRC companies, NJM14570 built-in chip types have IF amplifiers, orthogonal detection and
RSSI functions, complete the demodulation of FM signal, export 20Hz-20KHz audio signal；NJM14570 chips RSSI refers to simultaneously
Show that signal and AD8367 complete automatic growth control jointly（AGC）Function, to obtain good stability.Active low-pass filter
Constituted using the operational amplifier OPA350 and periphery RC circuits of TI companies, cut-off frequency is set to 25KHz, filtered out in audio signal
High-frequency noise.Audio-frequency amplifier uses the SSM2305 chips of ADI companies, and audio signal is further amplified to reach earphone
Output is required, audio signal finally is conveyed into earphone or loudspeaker.
The utility model is the improvement and innovation carried out to hardware system, the software being directed to or processing method
（Process）Prior art is belonged to, innovative content of the present utility model is not belonging to；The content that the utility model is not elaborated
Belong to prior art.
Described above is only, to preferred embodiments of the present utility model, not scope of the present utility model to be defined, therefore
On the premise of the utility model design spirit is not departed from, this area ordinary skill technical staff is to structure described in the utility model
Make, the equivalence changes that feature and principle are made or decoration, in the protection domain that present utility model application patent all should be fallen into.
Claims (6)
1. a kind of very high frequency(VHF) FM receiver, it is characterised in that：Including the antenna being sequentially connected, input signal conditioning module, mix
Frequency module, frequency discriminator block, audio signal output module；The input signal conditioning module includes radio frequency band filter, low noise
Acoustic amplifier；The frequency mixing module includes voltage controlled oscillator, Type Multiplicative frequency mixer, ceramic filter；The frequency discriminator block includes
Intermediate frequency amplifier, quadrature detector；The audio signal output module includes active low-pass filter, audio power and put
Big device；Radio frequency band filter, low-noise amplifier, Type Multiplicative frequency mixer, ceramic filter, intermediate frequency amplifier, Type Multiplicative phase
Position frequency discriminator, active low-pass filter, audio-frequency power amplifier are sequentially connected, and voltage controlled oscillator is connected with Type Multiplicative frequency mixer.
2. a kind of very high frequency(VHF) FM receiver according to claim 1, it is characterised in that：The input signal conditioning module
Complete twin aerial receives the filtering and amplification of signal；Radio frequency band filter therein is using the passive band logical filter of five rank Butterworths
Ripple device, to obtain flat passband；Low-noise amplifier selects JRC companies wide frequency low-noise amplifier NJG1146KG1, will connect
The tiny signal received is amplified.
3. a kind of very high frequency(VHF) FM receiver according to claim 1, it is characterised in that：The frequency mixing module completes signal
Frequency spectrum shift；Voltage controlled oscillator therein uses the MAX2606 chips of Maxim companies, obtains 98~120MHz local oscillator letter
Number；Type Multiplicative frequency mixer uses the AD8342 chips of ADI companies, by local oscillation signal and the output signal of input signal conditioning module
10.7MHz intermediate-freuqncy signal is obtained after progress mixing operation；Ceramic filter uses the SFECK10M7JA00S0 of Murata
Ceramic filter, enable upper level export 10.7MHz intermediate-freuqncy signals by and suppress other frequency signals and pass through.
4. a kind of very high frequency(VHF) FM receiver according to claim 1, it is characterised in that：The frequency discriminator block completes frequency modulation
The demodulation of signal, exports 20Hz-20KHz audio signal；Intermediate frequency amplifier therein uses the AD8367 chips of ADI companies,
Signal is further amplified；The NJM14570 chips of quadrature detector JRC companies complete the demodulation of FM signal；By
NJM14570 chip RSSI indication signals and AD8367 complete automatic gain control function jointly, to obtain good stability.
5. a kind of very high frequency(VHF) FM receiver according to claim 1, it is characterised in that：The audio signal output module
The output of audio signal is realized, loudspeaker sounding is promoted；Active low-pass filter therein uses the operational amplifier of TI companies
OPA350, filters out the high-frequency noise in audio signal；Audio-frequency power amplifier uses the SSM2305 chips of ADI companies, by audio
Further audio signal, to reach earphone output requirement, is finally conveyed to earphone or loudspeaker to signal by amplification.
6. a kind of very high frequency(VHF) FM receiver according to claim 1, it is characterised in that：The antenna uses 50 Ω pull bars
Antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720280296.6U CN206559337U (en) | 2017-03-21 | 2017-03-21 | A kind of very high frequency(VHF) FM receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720280296.6U CN206559337U (en) | 2017-03-21 | 2017-03-21 | A kind of very high frequency(VHF) FM receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559337U true CN206559337U (en) | 2017-10-13 |
Family
ID=60365065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720280296.6U Expired - Fee Related CN206559337U (en) | 2017-03-21 | 2017-03-21 | A kind of very high frequency(VHF) FM receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559337U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
-
2017
- 2017-03-21 CN CN201720280296.6U patent/CN206559337U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171013 Termination date: 20180321 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |