CN204633720U - A kind of signal for bus location amplifies biasing circuit - Google Patents
A kind of signal for bus location amplifies biasing circuit Download PDFInfo
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- CN204633720U CN204633720U CN201520459846.1U CN201520459846U CN204633720U CN 204633720 U CN204633720 U CN 204633720U CN 201520459846 U CN201520459846 U CN 201520459846U CN 204633720 U CN204633720 U CN 204633720U
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Abstract
The utility model discloses a kind of signal for bus location and amplify biasing circuit, comprise field effect transistor T1, negative feedback network is provided with between the grid of field effect transistor T1 and drain electrode, the grid of field effect transistor T1 is also connected with input matching network, the drain electrode of field effect transistor T1 is also connected with output matching network, the source ground of field effect transistor T1; Described negative feedback network comprises inductance L 1, resistance R4, resistance R2, the inductance L 2 of connecting successively, wherein, inductance L 1 is connected with the grid of field effect transistor T1, inductance L 2 is connected with the drain electrode of field effect transistor T1, connecting line between inductance L 1 and resistance R4 is also connected with the electric capacity C4 of ground connection, connecting line between resistance R4 and resistance R2 is also connected with the resistance R1 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the electric capacity C3 of ground connection, and the connecting line between resistance R2 and inductance L 2 is also connected with the resistance R3 accessing power supply.
Description
Technical field
The utility model relates to automobile receiver technology, and specifically a kind of signal for bus location amplifies biasing circuit.
Background technology
Low noise amplifier is the requisite vitals in communication, radar, electronic countermeasures and remote control telemetering system, it is positioned at the front end of radio-frequency receiving system, major function carries out Linear Amplifer to the weak radio-frequency signal that antenna receives, suppress various noise jamming simultaneously, improve the sensitivity of system.Particularly along with communication, electronic countermeasures, microwave measurement etc. are towards broadband, low noise, miniaturization development, the low noise of amplifier and broadband design problem obtain to be paid attention to more and more widely.
Utility model content
The purpose of this utility model is to provide a kind of signal for bus location to amplify biasing circuit, propose the bias circuit of the low-noise wide-band amplifier of a 50 ~ 300MHz, this amplifier has excellent gain flatness and noise factor in working frequency range, can improve the sensitivity of receiver.
The purpose of this utility model is achieved through the following technical solutions: a kind of signal for bus location amplifies biasing circuit, comprise field effect transistor T1, negative feedback network is provided with between the grid of field effect transistor T1 and drain electrode, the grid of field effect transistor T1 is also connected with input matching network, the drain electrode of field effect transistor T1 is also connected with output matching network, the source ground of field effect transistor T1, described negative feedback network comprises the inductance L 1 of connecting successively, resistance R4, resistance R2, inductance L 2, wherein, inductance L 1 is connected with the grid of field effect transistor T1, inductance L 2 is connected with the drain electrode of field effect transistor T1, connecting line between inductance L 1 and resistance R4 is also connected with the electric capacity C4 of ground connection, connecting line between resistance R4 and resistance R2 is also connected with the resistance R1 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the electric capacity C3 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the resistance R3 accessing power supply, connecting line between resistance R3 and power supply is also connected with the electric capacity C2 of ground connection and the electric capacity C1 of ground connection.
The design principle of foregoing circuit is: the major obstacle of wide-band amplifier design is the restriction of the gain bandwidth product of active device, and namely the gain of active device declines with 6dB/ octave in the high-end increase along with frequency of frequency.The method for designing that wide-band amplifier is conventional has: balanced structure formula amplifier, active matching circuit, and reactance network mates, broadband resistors match, distributed amplifier etc.The utility model adopts negative feedback amplifier, has following significantly advantage: reduce the susceptibility that whole circuit changes transistor self performance; Obtain good input resistant matching and lower noise factor; Increase the stability of amplifier in working band; Increase the linearity etc. of amplifier.Therefore, negative-feedback technology is widely deployed in the middle of the design of wide-band amplifier.In the utility model, arrange negative feedback network between the grid of field effect transistor T1 and drain electrode, field effect transistor T1 is made up of electric capacity, resistance and inductance.Wherein the effect of electric capacity prevents the direct current biasing of negative feedback network to transistor from having an impact; The effect of inductance reduces amplifier at the high-end feedback quantity of frequency, and the gain of offsetting amplifier increases with frequency and reduces, by regulating the size of inductance can the flatness of resonance-amplifier gain.Resistance plays primary feedback effect, can be regulated the number of feedback quantity by the size of adjusting resistance value.Simultaneously as feedback resistance R=g
m× Z
0 2time, amplifier can obtain good impedance matching.According to the low noise amplifier that foregoing circuit is arranged, in the working frequency range of broadband (50 ~ 300MHz), gain is greater than 22dB, and flatness is less than ± 0.3dB, and noise factor is less than 1.25, and input standing wave is less than 1.4, exports standing wave and is less than 1.3.Can find out that test result and the simulation result of low noise amplifier coincide better.But the noise factor of test is slightly poorer than simulation result, ratio of gains simulation result is slightly low, and this is the impact of the dead resistance due to electric capacity, inductance, and during debugging, the input port of filter and output port are not mate completely simultaneously, the ground connection property of device is not fine, and the impact of test cable and joint.
Preferably, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4 are power filtering capacitor.
Preferably, inductance L 2 and inductance L 1 are for being radio frequency choke coil.
The utility model has the advantage of: the circuit structure arranged according to the utility model, can show that low-noise wide-band amplifier is in the operating frequency band of 50-300MHz, gain is greater than 22dB, flatness is less than ± 0.3dB, noise factor is less than 1.25, input standing wave is less than 1.4, and input standing wave is less than 1.3.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
embodiment 1:
As shown in Figure 1.
A kind of signal for bus location amplifies biasing circuit, comprise field effect transistor T1, negative feedback network is provided with between the grid of field effect transistor T1 and drain electrode, the grid of field effect transistor T1 is also connected with input matching network, the drain electrode of field effect transistor T1 is also connected with output matching network, the source ground of field effect transistor T1, described negative feedback network comprises the inductance L 1 of connecting successively, resistance R4, resistance R2, inductance L 2, wherein, inductance L 1 is connected with the grid of field effect transistor T1, inductance L 2 is connected with the drain electrode of field effect transistor T1, connecting line between inductance L 1 and resistance R4 is also connected with the electric capacity C4 of ground connection, connecting line between resistance R4 and resistance R2 is also connected with the resistance R1 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the electric capacity C3 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the resistance R3 accessing power supply, connecting line between resistance R3 and power supply is also connected with the electric capacity C2 of ground connection and the electric capacity C1 of ground connection.
The design principle of foregoing circuit is: the major obstacle of wide-band amplifier design is the restriction of the gain bandwidth product of active device, and namely the gain of active device declines with 6dB/ octave in the high-end increase along with frequency of frequency.The method for designing that wide-band amplifier is conventional has: balanced structure formula amplifier, active matching circuit, and reactance network mates, broadband resistors match, distributed amplifier etc.The utility model adopts negative feedback amplifier, has following significantly advantage: reduce the susceptibility that whole circuit changes transistor self performance; Obtain good input resistant matching and lower noise factor; Increase the stability of amplifier in working band; Increase the linearity etc. of amplifier.Therefore, negative-feedback technology is widely deployed in the middle of the design of wide-band amplifier.In the utility model, arrange negative feedback network between the grid of field effect transistor T1 and drain electrode, field effect transistor T1 is made up of electric capacity, resistance and inductance.Wherein the effect of electric capacity prevents the direct current biasing of negative feedback network to transistor from having an impact; The effect of inductance reduces amplifier at the high-end feedback quantity of frequency, and the gain of offsetting amplifier increases with frequency and reduces, by regulating the size of inductance can the flatness of resonance-amplifier gain.Resistance plays primary feedback effect, can be regulated the number of feedback quantity by the size of adjusting resistance value.Simultaneously as feedback resistance R=g
m× Z
0 2time, amplifier can obtain good impedance matching.According to the low noise amplifier that foregoing circuit is arranged, in the working frequency range of broadband (50 ~ 300MHz), gain is greater than 22dB, and flatness is less than ± 0.3dB, and noise factor is less than 1.25, and input standing wave is less than 1.4, exports standing wave and is less than 1.3.Can find out that test result and the simulation result of low noise amplifier coincide better.But the noise factor of test is slightly poorer than simulation result, ratio of gains simulation result is slightly low, and this is the impact of the dead resistance due to electric capacity, inductance, and during debugging, the input port of filter and output port are not mate completely simultaneously, the ground connection property of device is not fine, and the impact of test cable and joint.
Preferably, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4 are power filtering capacitor.
Preferably, inductance L 2 and inductance L 1 are for being radio frequency choke coil.
As mentioned above, then well the utility model can be realized.
Claims (3)
1. the signal for bus location amplifies biasing circuit, it is characterized in that: comprise field effect transistor T1, negative feedback network is provided with between the grid of field effect transistor T1 and drain electrode, the grid of field effect transistor T1 is also connected with input matching network, the drain electrode of field effect transistor T1 is also connected with output matching network, the source ground of field effect transistor T1, described negative feedback network comprises the inductance L 1 of connecting successively, resistance R4, resistance R2, inductance L 2, wherein, inductance L 1 is connected with the grid of field effect transistor T1, inductance L 2 is connected with the drain electrode of field effect transistor T1, connecting line between inductance L 1 and resistance R4 is also connected with the electric capacity C4 of ground connection, connecting line between resistance R4 and resistance R2 is also connected with the resistance R1 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the electric capacity C3 of ground connection, connecting line between resistance R2 and inductance L 2 is also connected with the resistance R3 accessing power supply, connecting line between resistance R3 and power supply is also connected with the electric capacity C2 of ground connection and the electric capacity C1 of ground connection.
2. a kind of signal for bus location according to claim 1 amplifies biasing circuit, it is characterized in that: electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4 are power filtering capacitor.
3. a kind of signal for bus location according to claim 1 amplifies biasing circuit, it is characterized in that: inductance L 2 and inductance L 1 are for being radio frequency choke coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520459846.1U CN204633720U (en) | 2015-07-01 | 2015-07-01 | A kind of signal for bus location amplifies biasing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520459846.1U CN204633720U (en) | 2015-07-01 | 2015-07-01 | A kind of signal for bus location amplifies biasing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204633720U true CN204633720U (en) | 2015-09-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520459846.1U Expired - Fee Related CN204633720U (en) | 2015-07-01 | 2015-07-01 | A kind of signal for bus location amplifies biasing circuit |
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| CN (1) | CN204633720U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935267A (en) * | 2015-07-01 | 2015-09-23 | 成都众易通科技有限公司 | Signal amplification biasing circuit used in automobile positioning radio-frequency receiving system |
-
2015
- 2015-07-01 CN CN201520459846.1U patent/CN204633720U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935267A (en) * | 2015-07-01 | 2015-09-23 | 成都众易通科技有限公司 | Signal amplification biasing circuit used in automobile positioning radio-frequency receiving system |
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| 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 |
Granted publication date: 20150909 Termination date: 20160701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |