CN207518551U - A kind of high efficiency filtered power amplifier - Google Patents
A kind of high efficiency filtered power amplifier Download PDFInfo
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- CN207518551U CN207518551U CN201720440027.1U CN201720440027U CN207518551U CN 207518551 U CN207518551 U CN 207518551U CN 201720440027 U CN201720440027 U CN 201720440027U CN 207518551 U CN207518551 U CN 207518551U
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Abstract
The utility model discloses a kind of high efficiency filtered power amplifier, including input matching network structure, power tube, direct grid current feeding network, drain electrode DC feedback network and output matched filter network；The input matching network includes microstrip line, capacitance and π type input impedance conversion networks；The direct grid current feeding network includes microstrip-fed line and several first filter capacitors；The drain electrode DC feedback network includes output impedance converter, the microstrip-fed line of narrow side, the microstrip-fed line of broadside, capacitance and the second filter capacitor；The output matched filter network includes several step electric impedance resonators, micro-strip connecting line and port.The utility model, by the way that power amplifier and wave filter are connected directly, realizes miniaturization and high efficiency filtered power amplifier compared with existing independent design filtered power amplifier.
Description
Technical field
The utility model is related to wireless communication technology field, more particularly to a kind of high efficiency filtered power amplifier.
Background technology
Radio-frequency front-end is the important component of wireless communication system, is the indispensable key portion of wireless communication system
Part.Radio-frequency front-end includes Receiver And Transmitter, and wherein radio frequency sending set mainly includes power amplifier and wave filter, tradition side
Method is the two independent design, is then attached again.Shortcoming is that power amplifier needs most preferably to export it by matching network
It is impedance-matched to 50 ohm directly to be cascaded with filter network again, does so and be typically easy to bring that volume is big, total amount weight
Problem, meanwhile, the introducing of matching network will bring loss it is big and the shortcomings that reduce power amplifier output power.
With the development of wireless communication, communication system be increasingly intended to miniaturization and it is integrated, it is therefore, integrated to penetrate
Frequency receiver has great demand.Filtering power amplifier, which combines the front-end devices such as power amplifier, wave filter, to be designed, can
So that the structure of radio-frequency transmitter system is compacter, reduces unnecessary loss and introduce so that the miniaturization of radio-frequency transmitter
It is more prone to realize with high efficiency.
In existing radio-frequency receiving system, realize high efficiency radio-frequency transmitter mainly by output matching network by power
The best output impedance of amplifier is transformed to 50 ohm, then direct by 50 ohm of connecting line and 50 ohm of filter network
Cascade is realized.During due to design, the mismatch and wave filter and matching network of power amplifier and wave filter and 50 Ohm connection lines
The loss brought, the power added efficiency of usual power amplifier will substantially reduce.In general, the loss of 1dB can be by work(
The efficiency of rate amplifier drops to 60% from 80%.
The filtered power amplifier of integrated design is for the filtered power amplifier of independent design, due to that will filter
The input impedance of wave device is directly designed to the best output impedance of power amplifier, is put so as to eliminate independent design filtered power
The matching network structure of big device.Therefore the loss that matching network is brought, while integrated design filtered power amplifier are avoided
Realize the miniaturization of radio-frequency transmitter and integrated.
Utility model content
The technical problem to be solved by the present invention is to, a kind of high efficiency filtered power amplifier is provided, it is and existing
Independent design filtered power amplifier is compared, and by the way that power amplifier and wave filter are connected directly, realizes miniaturization and height
Efficiency filtered power amplifier.
In order to solve the above technical problems, the utility model provides following technical solution：A kind of high efficiency filtered power amplification
Device, including input matching network structure, power tube, direct grid current feeding network, drain electrode DC feedback network and output matching filter
Wave device network, wherein
The input matching network structure is used for the best input impedance for matching power tube by 50 ohm so that power is put
Big device reaches maximum power added efficiency；
The power tube is for the amplification to input signal；
The direct grid current feeding network is used to gate bias voltage being loaded into the grid of power tube, so as to provide power amplifier
The grid quiescent point of pipe；
The drain electrode DC feedback network is used to drain bias voltage being loaded into the grid of power tube, so as to provide power amplifier
The drain electrode quiescent point of pipe；
The output matched filter network is used to the best output impedance of power tube matching 50 ohm so that power
Amplifier reaches maximum power added efficiency；Export matched filter network simultaneously has the filtering characteristic of wave filter and right again
Higher hamonic wave is inhibited.
Further, the input matching network includes microstrip line, capacitance and π type input impedance conversion networks；
One end of the π types input impedance conversion network is connected with the power tube, the other end by the capacitance with it is described micro-
Band line is connected.
Further, the microstrip line is 50 ohm.
Further, the direct grid current feeding network includes microstrip-fed line and several first filter capacitors；It is described micro-
Upper end with feed line is connect respectively with each first filter capacitor, and the lower end of the microstrip-fed line and the π types are defeated
Enter the upper end connection of impedance transformer network.
Further, the microstrip-fed line is the microstrip-fed line of L-type, and the first filter capacitor quantity is 3.
Further, it is micro- to include output impedance converter, the microstrip-fed line of narrow side, broadside for the drain electrode DC feedback network
Band feed line, capacitance and the second filter capacitor；One end of the output impedance converting network connect with the power tube, is another
One end passes through the capacitance and the output matched filter network connection；One end of the narrow band microstrip feed line and institute
State the upper end connection of output impedance converting network, the other end is connect with the filter capacitor and the broadside direct-current tie.
Further, the length of the narrow side feeding microstrip line is λg/ 16, λgFor the high efficiency filtered power amplifier
The wavelength of the centre frequency of matching network.
Further, the output matched filter network includes several step electric impedance resonators, micro-strip connecting line and end
Mouthful, the electric impedance resonator connection micro-strip connecting line and port.
Further, the step electric impedance resonator is λg/ 4 step electric impedance resonator, λgWork(is filtered for the high efficiency
The wavelength of the centre frequency of rate amplifier matching network.
Further, the step electric impedance resonator quantity is 2, and each step electric impedance resonator includes narrow wall part
Point and broadside portion, coupled by gap between the broadside portion of 2 step electric impedance resonators, each stepped impedance resonance
The narrow side part of device is all connected with the micro-strip connecting line and port.
After adopting the above technical scheme, the utility model at least has the advantages that：
1st, Designing power amplifier and filter network are combined together by the utility model, and devising one has filtering
The high-efficiency amplifier of function.By the way that the input impedance of wave filter to be designed as to the optimum impedance of power amplifier, so as to make work(
It puts pipe and wave filter is connected directly, therefore the structure of power amplifier is compact；
2nd, the filter network structure of the utility model is based on λg/ 4 step electric impedance resonators, by by λg/ 4 ladders hinder
Antiresonance device folds so that entire filter construction is compacter；
3rd, the filter network structure of existing filtered power amplifier is normally based on the design method of bandpass filter
It is designed, and bandpass filter usually relatively focuses on the design in passband, outside the closer band of passband, inhibits signal
By effect be generally not fine, and the Out-of-band rejection for wanting to improve bandpass filter usually requires to increase bandpass filter
Exponent number so that the design of wave filter is more complicated, and size increases；The filter network structure of the utility model is based on λg/ 4 ranks
Terraced electric impedance resonator, by λgThe narrow side part of/4 step electric impedance resonators is connected by a narrow band microstrip line 21,
The frequency band of the both sides nearer apart from passband be able to generate a transmission zero, inhibit signal by effect it is preferable, therefore
It can realize preferable filtering characteristic and Out-of-band rejection characteristic.
Description of the drawings
Fig. 1 is a kind of structure diagram of high efficiency filtered power amplifier of the utility model；
Fig. 2 is a kind of structural representation of the progress number mark in detail of high efficiency filtered power amplifier of the utility model
Figure；
Fig. 3 is the input matching network and grid feeder structure of a kind of high efficiency filtered power amplifier of the utility model
Schematic diagram；
Fig. 4 is a kind of drain electrode feeder structure of high efficiency filtered power amplifier of the utility model and output matched filtering
Device schematic network structure；
Fig. 5 is a kind of impedance diagram of the output matched filter network of high efficiency filtered power amplifier of the utility model；
Fig. 6 is that S parameter curve graph is emulated in the utility model embodiment；
Fig. 7 is the analogous diagram of output power and efficiency in the utility model embodiment.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
It mutually combines, the application is described in further detail in the following with reference to the drawings and specific embodiments.
With reference to Fig. 1, Fig. 2, the present embodiment filtered power amplifier architecture, including input matching network structure 1, a power amplifier
Pipe 2, direct grid current feeding network 3, drain electrode DC feedback network 4 and output matched filter network 5.Power amplifier knot simultaneously
Structure is in the upper surface of medium substrate 6, and lower surface is floor of the conductive copper 7 as filtered power amplifier.The input
Distribution network 1 includes one section 50 ohm of microstrip line 8, capacitance 9, π type input impedance conversions network 10；The input impedance of π types becomes
One end of switching network 10 is connected with power tube 2, and the other end is connected by capacitance 9 with 50 ohm of microstrip line 8.The grid
Pole DC feedback network 3 includes the microstrip-fed line of L-type, and filter capacitor 12, filter capacitor 13 and filter capacitor 14 form；L-type is micro-
Upper end with feed line 11 is connected respectively with filter capacitor 12, filter capacitor 13, filter capacitor 14, the microstrip-fed line 11 of L-type
Lower end is connected with the upper end of π type input impedance conversions network 10, and the microstrip-fed line 11 of L-type and external dc are electrically connected to provide work(
Put tube grid voltage.The drain electrode DC feedback network 4 includes output impedance converter 15, the microstrip-fed line 17 of narrow side, width
The microstrip-fed line 18 in side, capacitance 19 and filter capacitor 16；One end of output impedance converter 15 is connected with power tube, another
End is connected by capacitance 19 with output matched filter network 5；One end of the microstrip-fed line 17 of narrow side becomes with output impedance
The upper end of switching network 10 is connected, and the other end is connected with filter capacitor 16 and broadside direct-current tie 18.Wideband microband line 18 and outer
Portion's direct current is electrically connected to provide power tube drain voltage.The output matched filter network 5 includes two (1/4) λgRank
Terraced electric impedance resonator 20a, 20b, one section of micro-strip connecting line 21 and port 2.(1/4)λgStep electric impedance resonator 20a passes through narrow side
Port on part is connected with capacitance 19, (1/4) λgStep electric impedance resonator 20a and (1/4) λgStep electric impedance resonator
20b broadside portions are separated by a bit of gap, and narrow side part is connected by narrow side micro-strip connecting line 21.
As an example, when requiring design CGH40010F power tube centre frequency 2.45G, bandwidth of operation is 180M's
It is 14+14*j Ω in the best output impedance of center frequency point during high efficiency filtered power amplifier.With reference to Fig. 3 and Fig. 4 institutes
The size marking shown, the dielectric-slab that relative dielectric constant is used to be 0.8mm for 2.55, thickness do substrate, 50 ohm of microstrip line
Key dimension 8a, 8b be respectively 2.2mm and 6mm.Key dimension 23a, 23b of π type input impedance conversion networks, 26a, 26b,
27a, 27b are respectively 2.2mm, 7.9mm, 2.6mm, 8.6mm, 13.8mm, 2.6mm.The key dimension 24a of the microstrip-fed line of L-type,
24b, 25a, 25b are respectively 7.6mm, 2.4mm, 2.4mm, 9.6mm.Capacitance 9, filter capacitor 12, filter capacitor 13, filtering
The capacitance of capacitance 14 is respectively 4.7pf, 100pf, 10pf, 1pf.The key dimension 15a and 15b of output impedance variator be respectively
2.2mm and 2mm.Key dimension 17a, 17b of narrow side feed line and divide positioned at the position 33 of output impedance converter upper surface
It Wei not 6mm, 0.5mm, 0.6mm.Key dimension 18a, 18b of broadside feed line is respectively 6.8mm and 2mm.Encapsulation number is 0603
Capacitance 19 and the capacitance of filter capacitor 16 be respectively 3.9pf, 10pf.The key dimension 28a of port 28 and port 22,
28b, 22a, 22b are respectively 1.5mm, 1.6mm, 1.5mm, 2.2mm.(1/4)λgThe key dimension 34 of step electric impedance resonator,
35th, 36,29a, 29b, 37 are respectively 9.7mm, 0.8mm, 0.7mm, 9.6mm, 2mm, 9.9mm.(1/4)λgStep electric impedance resonator
Radius R and the r size of disk and via is respectively 0.7mm, 0.4mm.Two (1/4) λgGap between step electric impedance resonator
30 size is 0.2mm.Key dimension 22a, 22b of port two is respectively 2.2mm, 2.3mm.The key dimension of narrow side microstrip line
31a and 31b is respectively 0.5mm, 5.6mm.
For the design example, it is preferred that the CGH40010F GaN of the power tube selection GREE companies production
HEMT power tubes；Capacitance selects ATC600S3R9 or ATC600S4R7；Filter capacitor select ATC600S1R0 or
ATC600S100 or ATC600S101.
Preferably, the length of the narrow side feeding microstrip line is (1/16) λg, λgIt is matched for high efficiency filtered power amplifier
The wavelength of the centre frequency of network.
Preferably, the length of the step electric impedance resonator of the second order filter network is (1/4) λg, λgIt is filtered for high efficiency
The wavelength of the centre frequency of Power Amplifier matching network.
Preferably, the length of the narrow side bending part of the second-order filter network is (1/8) λg, λgWork(is filtered for high efficiency
The wavelength of the centre frequency of rate amplifier matching network.
The Smith impedance diagrams of the filter construction are as shown in Figure 5, it can be seen that, it is more concentrated in 2.4G-2.5G impedances
Near the best output impedance 14+14*j of power amplifier.The filtered power amplifier matching network is at one end best output
S parameter in the case that the other end is 50 ohm in the case of the conjugation (14-14*j) of impedance is as shown in Figure 6.It can be seen that logical
Minimum 0.4dB in band, 60dB and 73dB have been respectively reached, while Out-of-band rejection is equal in the inhibition of two transmission zeros 2G and 4G
More than 30dB.The analogous diagram for connecting output power in the case of power amplifier and efficiency is as shown in Figure 7, it can be seen that this
The output power of power amplifier under distribution network is both greater than 40dBm under 2.36GHZ-2.54GHZ, and efficiency is all higher than 60%.
Show good filtering characteristic and high efficiency.
While there has been shown and described that the embodiment of the utility model, for the ordinary skill in the art,
It is understood that these embodiments can be carried out in the case of the principle and spirit for not departing from the utility model a variety of etc.
The change, modification, replacement and modification of effect, the scope of the utility model are limited by appended claims and its equivalency range.
Claims (10)
1. a kind of high efficiency filtered power amplifier, which is characterized in that straight including input matching network structure, power tube, grid
Current feed network, drain electrode DC feedback network and output matched filter network, wherein
The input matching network structure is used for the best input impedance for matching power tube by 50 ohm so that power amplifier
Reach maximum power added efficiency；
The power tube is for the amplification to input signal；
The direct grid current feeding network is used to gate bias voltage being loaded into the grid of power tube, so as to provide power tube
Grid quiescent point；
The drain electrode DC feedback network is used to drain bias voltage being loaded into the drain electrode of power tube, so as to provide power tube
Drain quiescent point；
The output matched filter network is used to the best output impedance of power tube matching 50 ohm so that power amplification
Device reaches maximum power added efficiency；Export matched filter network simultaneously has the filtering characteristic of wave filter and to high order again
Harmonic wave is inhibited.
A kind of 2. high efficiency filtered power amplifier according to claim 1, which is characterized in that the input matching network
Including microstrip line, capacitance and π type input impedance conversion networks；One end of the π types input impedance conversion network and institute
State that power tube is connected, the other end is connected by the capacitance with the microstrip line.
3. a kind of high efficiency filtered power amplifier according to claim 2, which is characterized in that the microstrip line is 50 Europe
Nurse.
A kind of 4. high efficiency filtered power amplifier according to claim 2, which is characterized in that the direct grid current feed
Network includes microstrip-fed line and several first filter capacitors；It is filtered respectively with each described first the upper end of the microstrip-fed line
Wave capacitance connection, the lower end of the microstrip-fed line are connect with the upper end of the π types input impedance conversion network.
5. a kind of high efficiency filtered power amplifier according to claim 4, which is characterized in that the microstrip-fed line is
The microstrip-fed line of L-type, the first filter capacitor quantity are 3.
A kind of 6. high efficiency filtered power amplifier according to claim 1, which is characterized in that the drain electrode DC feedback
Network includes output impedance converter, the microstrip-fed line of narrow side, the microstrip-fed line of broadside, capacitance and the second filter capacitor；
One end of the output impedance converting network is connect with the power tube, the other end passes through the capacitance and the output
It is connected with filter network；One end of the microstrip-fed line of narrow side connect with the upper end of the output impedance converting network, is another
One end is connect with the filter capacitor and the broadside direct-current tie.
A kind of 7. high efficiency filtered power amplifier according to claim 6, which is characterized in that the narrow side fed microstrip
The length of line is λg/ 16, λgThe wavelength of centre frequency for the high efficiency filtered power amplifier matching network.
A kind of 8. high efficiency filtered power amplifier according to claim 1, which is characterized in that the output matched filtering
Device network includes several step electric impedance resonators, micro-strip connecting line and port, electric impedance resonator connection micro-strip connecting line and
Port.
A kind of 9. high efficiency filtered power amplifier according to claim 8, which is characterized in that the stepped impedance resonance
Device is λg/ 4 step electric impedance resonator, λgThe wavelength of centre frequency for the high efficiency filtered power amplifier matching network.
A kind of 10. high efficiency filtered power amplifier according to claim 8 or claim 9, which is characterized in that the stepped impedance
Number of resonators is 2, and each step electric impedance resonator includes narrow side part and broadside portion, 2 stepped impedance resonance
It is coupled between the broadside portion of device by gap, the narrow side part of each step electric impedance resonator is all connected with the micro-strip and connects
Wiring and port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720440027.1U CN207518551U (en) | 2017-04-25 | 2017-04-25 | A kind of high efficiency filtered power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720440027.1U CN207518551U (en) | 2017-04-25 | 2017-04-25 | A kind of high efficiency filtered power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207518551U true CN207518551U (en) | 2018-06-19 |
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ID=62530672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720440027.1U Expired - Fee Related CN207518551U (en) | 2017-04-25 | 2017-04-25 | A kind of high efficiency filtered power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207518551U (en) |
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2017
- 2017-04-25 CN CN201720440027.1U patent/CN207518551U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20180619 |