CN203241535U - Fish finder - Google Patents
Fish finder Download PDFInfo
- Publication number
- CN203241535U CN203241535U CN 201320057070 CN201320057070U CN203241535U CN 203241535 U CN203241535 U CN 203241535U CN 201320057070 CN201320057070 CN 201320057070 CN 201320057070 U CN201320057070 U CN 201320057070U CN 203241535 U CN203241535 U CN 203241535U
- Authority
- CN
- China
- Prior art keywords
- emitter
- triode
- circuit
- amplification circuit
- fish finder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a fish finder, which comprises a triode common-emitter amplification circuit. The amplification circuit comprises a current collection junction capacitor and a bypass capacitor which is in parallel connection with an emitter electrode resistor. Both the current collection junction capacitor and the bypass capacitor are connected between a collector electrode and an emitter electrode. The triode common-emitter amplification circuit further comprises a control unit which is used for controlling the working state of the amplification circuit. The difference between the fish finder provided by the utility model and a fish finder in the prior art lies in the adoption of the amplification circuit. The amplification circuit is formed by additionally arranging the emitter electrode bypass capacitor and the current collection junction capacitor on the basis of a conventional common-emitter amplification circuit. The AC signal amplification factor of the circuit is then significantly improved. Meanwhile, the AC noise is suppressed. The performance of the circuit is further enhanced. Furthermore, the fish finder adopting the circuit makes the wireless communication process between a son machine and a mother machine of the fish finder more stable. Equipment performance is more excellent.
Description
Technical field
The utility model belongs to the application field of consumer electronics, relates to a kind of fish detector, relates in particular to a kind of fish detector that uses the amplifying circuit of high output resistance.
Background technology
A kind of fish detector (adopting communication between the composite aircraft) that has used surface acoustic wave sensor to carry out the acoustic-electric conversion and adopted composite aircraft in the market is comprising the amplification circuit of electrical signal part.In the prior art, this amplifying circuit is realized by common common emitter amplifying circuit usually.Concrete, amplifying circuit exports antenna to after the acoustic signals that converts electric signal through surface acoustic wave sensor to is amplified, and realizes radio communication between the composite aircraft by the transmit receive antenna between the composite aircraft.This common emitter amplification circuit structure for the amplifying power of AC signal a little less than, and the AC signal after amplifying is easily flooded by the noise in the direct current signal, and because this circuit output impedance is not high, output AC signal voltage amplitude is also lower, and these characteristics have all produced certain impact for performance and the communication quality of antenna performance.
The utility model content
The purpose of this utility model is existing to adopt the problems such as the limited and noise of the signal power of communicating by letter between the fish detector composite aircraft of common emitter amplifying circuit is larger to propose a kind of fish detector in order to solve.
The technical solution of the utility model is: a kind of fish detector, comprise the triode total radio amplifier, described triode total radio amplifier comprises transistor, the base stage of this transistor links to each other with the output terminal of surface acoustic wave sensor, be connected with an emitter resistance between emitter and the ground, collector is connected with power supply and as the output of amplifying circuit;
It is characterized in that, this amplifying circuit also comprises the collector junction capacitance that is connected between collector and the emitter and the shunt capacitance in parallel with emitter resistance.
Further, above-mentioned triode total radio amplifier also comprises control module, and described control module is used for the duty of control amplifying circuit.
Further, above-mentioned control module comprises divider resistance, and described divider resistance one end is connected with the IO mouth of main control unit, and the other end is connected in the base stage of triode.
The beneficial effects of the utility model: a kind of fish detector of the present utility model amplifying circuits of being adopt in the utility model scheme different from fish detector of the prior art, this amplifying circuit has been set up emitter shunt capacitance and collector junction capacitance at traditional common emitter amplifying circuit, the AC signal enlargement factor that is circuit is able to larger lifting, AC noise is suppressed simultaneously, and the performance of circuit is promoted.And then the wireless communication procedure between its composite aircraft of fish detector of employing sort circuit is more stable, and equipment performance is more superior.
Description of drawings
Fig. 1 is the circuit theory diagrams of embodiment 2 of the present utility model;
Fig. 2 is the circuit of embodiment of the present utility model and the output waveform comparison diagram of available circuit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is further elaborated.
Embodiment 1:
As shown in Figure 1, a kind of fish detector of the present utility model, comprise the triode total radio amplifier, this triode total radio amplifier comprises transistor Q1, the base stage of Q1 links to each other with the output terminal of surface acoustic wave sensor (being the SAW generating unit), be connected with an emitter resistance R1 between emitter and the ground, collector is connected with power vd D and as the output of amplifying circuit; Concrete, the output terminal of amplifying circuit (collector of triode) is connected with antenna by coupling capacitance C1.This amplifying circuit also comprises the collector junction capacitance C2 that is connected between collector and the emitter and the shunt capacitance C3 in parallel with emitter resistance R1 simultaneously.
Embodiment 2:
The triode total radio amplifier of the present embodiment comprises the amplifying circuit of embodiment 1, and in order to control conveniently, the present embodiment has increased a control module, is used for the duty of control amplifying circuit.
As shown in Figure 1, the control module among the embodiment 2 specifically comprises divider resistance, and described divider resistance R2 one end is connected with the IO1 mouth of main control unit, and the other end is connected in the base stage of triode.IO1 is controlled by master chip, master chip is by the IO1 output signal, this signal level is after the R2 dividing potential drop, export the base stage of triode Q1 to, when IO1 is output as high level, Vbe ≈ 0.5V, at this moment, the high frequency ac signal of SAW (Surface Acoustic Wave) resonator output and the stack of this DC component are amplified driven antenna by triode Q1 with this AC signal.
Embodiment 3:
Above-mentioned triode is specifically realized by negative-positive-negative transistor.
When the IO1 output low level, the SAW (Surface Acoustic Wave) resonator output AC voltage is lower than the base stage conducting threshold voltage of triode Q1, triode Q1 cut-off, and antenna is not worked.
As shown in Figure 2, will have in the fish detector that triode Q1 collector voltage waveform compares in the triode Q1 collector voltage waveform and this patent fish detector now, triode Q1 collector voltage is more stable in this patent circuit as can be known, and amplitude is higher.
The emitter-base bandgap grading of triode Q1 increases the emitter-base bandgap grading biasing resistor in original amplifying circuit, for amplifying circuit provides negative feedback, improves the consistance of this amplifying circuit performance under the varying environment temperature, simultaneously, improves the output resistance of this amplifying circuit.Secondly, triode Q1 increases emitter-base bandgap grading shunt capacitance C3, and the capacitance of establishing C3 is C, the surface acoustic wave frequency is w, value jwC＜R1 then, AC signal by the time, the circuit negative feedback reduces, to improve this amplifying circuit for the gain of AC signal, at last, at collector and the emitter-base bandgap grading flying capcitor C2 of triode Q1, reduce the output resistance of high frequency ac signal, guarantee that triode collector voltage amplitude increases when AC signal is passed through.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present utility model, should to be understood to that protection domain of the present utility model is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from the utility model essence according to disclosed these technology enlightenments of the utility model, and these distortion and combination are still in protection domain of the present utility model.
Claims (5)
1. fish detector, comprise the triode total radio amplifier, described triode total radio amplifier comprises transistor, the base stage of this transistor links to each other with the output terminal of surface acoustic wave sensor, be connected with an emitter resistance between emitter and the ground, collector is connected with power supply and as the output of amplifying circuit.
2. a kind of fish detector according to claim 1 is characterized in that, described amplifying circuit also comprises the collector junction capacitance that is connected between collector and the emitter and the shunt capacitance in parallel with emitter resistance.
3. a kind of fish detector according to claim 1, described triode total radio amplifier also comprises control module, described control module is used for the duty of control amplifying circuit.
4. a kind of fish detector according to claim 3, described control module comprises divider resistance, and described divider resistance one end is connected with the IO mouth of main control unit, and the other end is connected in the base stage of triode.
5. according to claim 1 to the described a kind of fish detector of each claim of 4, described triode is specifically realized by negative-positive-negative transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320057070 CN203241535U (en) | 2013-02-01 | 2013-02-01 | Fish finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320057070 CN203241535U (en) | 2013-02-01 | 2013-02-01 | Fish finder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203241535U true CN203241535U (en) | 2013-10-16 |
Family
ID=49318817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320057070 Expired - Fee Related CN203241535U (en) | 2013-02-01 | 2013-02-01 | Fish finder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203241535U (en) |
-
2013
- 2013-02-01 CN CN 201320057070 patent/CN203241535U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203241535U (en) | Fish finder | |
| CN202737853U (en) | FM transmitter with low power and high sensitivity | |
| CN203057076U (en) | Amplifying circuit with high upper limiting frequency | |
| CN202075340U (en) | Power detector for radio-frequency power amplifier | |
| CN204631669U (en) | A kind of rate signal modulate circuit | |
| CN106911984A (en) | Phonoreception circuit based on amplifier | |
| CN204615643U (en) | The power circuit of communication base station remote power-feeding | |
| CN202696583U (en) | Multi-functional minitype frequency modulation emitter | |
| CN202750078U (en) | FM transmitter with low power and high sensitivity | |
| CN204886882U (en) | Preamplifier | |
| CN202059555U (en) | Circuit for eliminating starting noise | |
| CN202649296U (en) | Speech warning circuit of DC power source | |
| CN204244181U (en) | The amplifying circuit of analog signal of radiofrequency signal | |
| CN205491092U (en) | Audio frequency limit circuit | |
| CN201323553Y (en) | Novel pulse width modulation amplifier | |
| CN203180886U (en) | Constant power ultrasonic oscillator with water shortage protection function | |
| CN202931294U (en) | High sensitivity FM transmitter | |
| CN203537328U (en) | Frequency-adjustable triangular wave power amplifier | |
| CN203193616U (en) | Low-power high-sensitivity frequency band transmitter | |
| CN203057083U (en) | High-accuracy negative feedback active audio machine | |
| CN201717832U (en) | Super class A biasing circuit, | |
| CN105554672A (en) | Electronic hearing aid device for the old aged | |
| CN207664871U (en) | A kind of amplifier power supply automatic pressure-transforming circuit | |
| CN105491497A (en) | Hearing-aid instrument for hearing impairment | |
| CN105635923A (en) | Electronic hearing aid |
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: 20131016 Termination date: 20190201 |