CN205961067U - A novel pi type sensor for balanced radio frequency amplifier of UHF - Google Patents
A novel pi type sensor for balanced radio frequency amplifier of UHF Download PDFInfo
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- CN205961067U CN205961067U CN201620917759.0U CN201620917759U CN205961067U CN 205961067 U CN205961067 U CN 205961067U CN 201620917759 U CN201620917759 U CN 201620917759U CN 205961067 U CN205961067 U CN 205961067U
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Abstract
The utility model discloses a novel pi type sensor for balanced radio frequency amplifier of UHF, including input, output, resistance R1, R2, R3, electric capacity C, microstrip line TL2, TL4, the input is established ties with resistance R1, output in proper order, and it has electric capacity C to connect in parallel in resistance R1 both ends, and R1 still links the one end that has resistance R2 with the input junction, and the R2 other end passes through microstrip line TL2 ground connection, and R1 still links the one end that has resistance R3 with the output junction, and the R3 other end passes through microstrip line TL4 ground connection. The input impedance that microstrip line TL2, TL4 have changed the ground connection section has been used for low frequency signals can be good the transmission and high frequency signal reflects. The utility model has the advantages of: it is effectual to attenuate, realize the inconsistent function of different frequency decrement, the circuit is simple.
Description
Technical field
This utility model is related to a kind of attenuator and in particular to a kind of new π type for UHF balanced radio frequency amplifier passes
Sensor.
Background technology
Radio frequency amplifier is applied between antenna and rear end receiver, has to wireless radiofrequency signal of telecommunication LNA or benefit
Repay the function of transmission line loss.Balanced radio frequency amplifier be for broadband signal amplify and to different frequency bands magnification ratio not
The amplifier designing, accordingly different to the amplification of different frequency from unlike base amplifier together.Common wideband
Feature with amplifier is that low frequency point amplification is high, the low feature of high frequency points amplification, and balanced radio frequency amplifier with front
The common wide Amplifier Design performance in face is just contrary, and low frequency point amplification is low, and high frequency points amplification is high.This can answer
For special occasions.Prior art first chooses the low-noise amplifier in a broadband as input stage amplifier, Ran Houyong
Attenuator carries out full frequency band fixed attenuation, then the electric capacity effect of one low-capacitance of interpolation is to reduce declining of high frequency points on attenuator
Decrement, reaches the purpose of design of design equalizer amplifier.
Traditional equalizer amplifier is operated in 30MHz-3000MH frequency range, and legacy attenuator is difficult to meet 30- first
The adjustable attenuation of the whole frequency range of 3000MHz, secondly, only can not come the compensation to carry out front end decay by a coupling electric capacity
Meet and require, and the output standing wave deteriorating.
Utility model content
Technical problem to be solved in the utility model is that traditional attenuator pad value in whole broadband is not easily-controllable
Make and add electric capacity and be degrading output standing wave, the transmission to signal has an impact it is therefore intended that providing a kind of equilibrium for UHF to penetrate
The new π type sensor of audio amplifier, solves balanced radio frequency amplifier operation in 30MHz-3000MHz, the radio frequency to this frequency range
The problem that signal is amplified.
This utility model is achieved through the following technical solutions：
A kind of new π type sensor for UHF balanced radio frequency amplifier, including input, outfan, resistance R1, R2,
R3, electric capacity C, microstrip line TL2, TL4；Input is sequentially connected in series with resistance R1, outfan, and resistance R1 two ends are parallel with electric capacity C, R1
Also it is connected with one end of resistance R2 with input junction, the R2 other end is grounded by microstrip line TL2, R1 is with outfan junction also
It is connected with one end of resistance R3, the R3 other end is grounded by microstrip line TL4.Apply microstrip line TL2, TL4 and change ground section
Input impedance so that low frequency signal can be good transmission and high-frequency signal is reflected.It is exactly briefly new decay
Device can carry out the decay of 10dB to low frequency point and only have the decay of 0.5dB to high frequency points.This designs a broadband to us
Equalizer amplifier has vital effect.Carry out impedance conversion using microstrip line TL2, TL4 to realize different frequency and decline simultaneously
The inconsistent function of decrement.
R1=50Ω、R2=R3.R1=Zc (N*N-1)/2N=50 Ω, π type attenuator is symmetrical attenuator, is mainly used in declining
Subtract, R2=R3, Zc are output impedance.
R2=R3=82Ω.R2=R3=Zc (N+1)/(N-1)=82 Ω, Zc are output impedance.
Electric capacity C=3.3pF.f0=1/2πR1C.When frequency input signal is less than f0, signal opposing circuit is direct current, electricity
The total impedance on road is equal to R1;When frequency input signal is more than f0, the capacitive reactance of C is comparatively small, and total impedance is for resistance simultaneously
Upper electric capacity capacitive reactance.When frequency height to a certain extent after total impedance be 0.
This utility model compared with prior art, has such advantages as and beneficial effect：
1st, a kind of new π type sensor for UHF balanced radio frequency amplifier, carries out impedance conversion using microstrip line, real
The inconsistent function of existing different frequency attenuation.
2nd, a kind of new π type sensor for UHF balanced radio frequency amplifier, circuit structure simple it is not necessary to complexity
Debugging efforts.
Brief description
Accompanying drawing described herein is used for providing this utility model embodiment is further understood, and constitutes the one of the application
Part, does not constitute the restriction to this utility model embodiment.In the accompanying drawings：
Fig. 1 is this utility model structural representation.
Fig. 2 is this utility model attenuator circuit software emulation result figure.
Specific embodiment
For making the purpose of this utility model, technical scheme and advantage become more apparent, with reference to embodiment and accompanying drawing,
The utility model is described in further detail, and exemplary embodiment of the present utility model and its explanation are only used for explaining this
Utility model, is not intended as to restriction of the present utility model.
Embodiment 1
As shown in Figure 1 and Figure 2, a kind of new π type sensor for UHF balanced radio frequency amplifier, including input, defeated
Go out end, resistance R1=50 Ω, R2=R3=82 Ω, electric capacity C=3.3pF, the long 10mm width of microstrip line TL2 long 10mm width 1.5mm, TL4
1.5mm；Input is sequentially connected in series with resistance R1, outfan, and resistance R1 two ends are parallel with electric capacity C, and R1 is with input junction also
It is connected with one end of resistance R2, the R2 other end is grounded by microstrip line TL2, R1 and outfan junction are also connected with the one of resistance R3
End, the R3 other end is grounded by microstrip line TL4, and electric current inputs π type sensor by input, through R1, R2, R3 decay, after C filtering
Flow out from outfan, preferably can be decayed by adjusting microstrip line TL2, TL4 Length x Width and adjusting R1, R2, R3 impedance and reach
Effect.
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step describes in detail, be should be understood that and the foregoing is only specific embodiment of the present utility model, is not used to limit
Fixed protection domain of the present utility model, all any modifications within spirit of the present utility model and principle, made, equivalent replaces
Change, improve, should be included within protection domain of the present utility model.
Claims (4)
1. a kind of new π type sensor for UHF balanced radio frequency amplifier it is characterised in that include input, outfan,
Resistance R1, R2, R3, electric capacity C, microstrip line TL2, TL4；Input is sequentially connected in series with resistance R1, outfan, and resistance R1 two ends are in parallel
There is an electric capacity C, R1 and input junction are also connected with one end of resistance R2, the R2 other end is grounded by microstrip line TL2, R1 and output
End junction is also connected with one end of resistance R3, and the R3 other end is grounded by microstrip line TL4.
2. a kind of new π type sensor for UHF balanced radio frequency amplifier according to claim 1 it is characterised in that
R1=50Ω、R2=R3.
3. a kind of new π type sensor for UHF balanced radio frequency amplifier according to claim 1 it is characterised in that
R2=R3=82Ω.
4. a kind of new π type sensor for UHF balanced radio frequency amplifier according to claim 1 it is characterised in that
Electric capacity C=3.3pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620917759.0U CN205961067U (en) | 2016-08-23 | 2016-08-23 | A novel pi type sensor for balanced radio frequency amplifier of UHF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620917759.0U CN205961067U (en) | 2016-08-23 | 2016-08-23 | A novel pi type sensor for balanced radio frequency amplifier of UHF |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205961067U true CN205961067U (en) | 2017-02-15 |
Family
ID=57977903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620917759.0U Active CN205961067U (en) | 2016-08-23 | 2016-08-23 | A novel pi type sensor for balanced radio frequency amplifier of UHF |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205961067U (en) |
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2016
- 2016-08-23 CN CN201620917759.0U patent/CN205961067U/en active Active
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| GR01 | Patent grant |