CN101882913A - Circuit for improving linearity and power added efficiency of power amplifier - Google Patents
Circuit for improving linearity and power added efficiency of power amplifier Download PDFInfo
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- CN101882913A CN101882913A CN 201010160917 CN201010160917A CN101882913A CN 101882913 A CN101882913 A CN 101882913A CN 201010160917 CN201010160917 CN 201010160917 CN 201010160917 A CN201010160917 A CN 201010160917A CN 101882913 A CN101882913 A CN 101882913A
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Abstract
The invention discloses a circuit for improving the linearity and power added efficiency of a power amplifier. The power amplifier is in a Cascode structure formed by overlapping a grounded-emitter transistor and a grounded-base transistor in series; a first secondary harmonic resonance network for suppressing secondary harmonic signals is connected between the collector of the grounded-emitter transistor and the ground; a second secondary harmonic resonance network for suppressing secondary harmonic signal output is connected between the collector of the grounded-base transistor and the ground; and a third harmonic resonance network for reflecting third harmonic signals to the collector is connected between the collector of the grounded-base transistor and the output port. The invention adopts the resonance networks for respectively processing the fundamental harmonic, the secondary harmonic and the third harmonic, thereby achieving the purposes of smoothly passing the fundamental harmonic, short circuiting the secondary harmonic to the ground and obstructing the third harmonic to be overlaid with the fundamental harmonic, and improving the linearity and the power added efficiency of the power amplifier.
Description
Technical field
The present invention relates to a kind of circuit that improves power amplifier linearity and power added efficiency.
Background technology
Power amplifier is one of the strongest non-linear device in the communication system, its nonlinear distortion will cause the wireless communication system spread spectrum and disturb the neighboring trace signal and worsen the error rate, the data transfer rate of reduction system and the capacity of system is reduced increases the system channel frequency difference and the availability of frequency spectrum of system is descended.In addition, for whole system, power amplifier itself has very big power consumption, has accounted for more than 60% of system power dissipation, and the power consumption that reduces power amplifier is for prolonging system service time, reduce electrical source consumption, reducing system bulk weight etc. and play key effect.Therefore, design high linearity and high efficiency power amplifier become the main trend of present power amplifier design.
At present, Chang Yong linearization technique has back-off, negative feedback, feedforward etc.Though the back-off method realizes simple, does not need to increase any equipment, be that cost exchanges the linearity for the efficient of reduction power amplifier, in the power amplification system that power output and efficient are had relatively high expectations, this method is not too suitable.The restriction that the negative feedback method is postponed by feedback network, limited bandwidth is not suitable for broadband and amplifies, and phase place is difficult to control, is easy to generate positive feedback and causes instability.Feed forward approach requires relatively stricter to the transfer characteristic of circuit element, span of control limit of control and phase place accurately in trimming process need booster amplifier, and circuit structure is complicated, and cost improves.Improve power added efficiency can with method LINC (using the linear amplification of non-linear element), EE﹠amp are arranged; R (envelope is eliminated and recovered), Doherty etc.LINC is very responsive to gain on two paths and phase difference, and any matching error of gain and phase place all can cause the incomplete elimination of distorted signal, has a strong impact on the system linearity degree.The coupling difficulty of gain and phase place makes LINC still seldom use so far.EE﹠amp; The shortcoming of R is that the precision and the performance of modulation changes with variation of temperature in time, and the AM of modulator (amplitude modulation(PAM)), PM factors such as (phase modulated) will influence the distortion output product of amplifier, can produce additional high-order product.Though the Doherty power amplifier has very high efficient, its linearity is relatively poor.
Summary of the invention
The present invention seeks to: a kind of circuit that improves power amplifier linearity and power added efficiency is provided, the processing that it is carried out short circuit or open circuit harmonic component, improved the linearity and the power added efficiency of power amplifier, and circuit structure simple, be easy to realize.
Technical scheme of the present invention is: a kind of circuit that improves power amplifier linearity and power added efficiency, described power amplifier is for by the folded Cascode structure that constitutes of grounded-emitter transistor and grounded-base transistor string, from the collector electrode of described grounded-emitter transistor to the first second harmonic resonant network that is connected with the inhibition second harmonic signal the ground; Suppress the second second harmonic resonant network that second harmonic signal is exported from the collector electrode of described grounded-base transistor to being connected with the ground; From the collector electrode of described grounded-base transistor to the triple-frequency harmonics resonant network that is connected with the output port harmonic signal reflected back collector electrode.The described first and second second harmonic resonant network resonance are shorted to ground to second harmonic signal in second harmonic frequency, have improved the linearity of power amplifier.Described triple-frequency harmonics resonant network resonance is in triple-frequency harmonics, the collector electrode of harmonic signal reflected back grounded-base transistor, make the harmonic signal and the fundamental signal stack that reflect, form the waveform of approximate square wave, increased the angle of flow, improved the power added efficiency of power amplifier with this.
Further, in the foregoing circuit structure, the described first second harmonic resonant network comprises first inductance, first electric capacity, second inductance and second electric capacity, described first inductance and first electric capacity constitute the first second harmonic series resonance network from the collector electrode of grounded-emitter transistor to series connection the ground, and is in parallel with the described first second harmonic series resonance network after described second inductance and second electric capacity are connected mutually.Described first inductance and the first capacitances in series resonance are in second harmonic frequency; Described first inductance, second electric capacity, second electric capacity and the second inductance parallel resonance are in fundamental frequency, and second electric capacity is capacitance.
Further, in the foregoing circuit structure, the described second second harmonic resonant network comprises that collector electrode from grounded-base transistor is to the 3rd electric capacity of connecting the ground and the 3rd inductance.Described the 3rd electric capacity and the 3rd inductance series resonance are in second harmonic frequency.
Further, in the foregoing circuit structure, described triple-frequency harmonics resonant network comprises from the collector electrode of grounded-base transistor to the 4th electric capacity and the 4th inductance in parallel the output port of power amplifier.Described the 4th electric capacity and the 4th inductance parallel resonance are in third harmonic frequencies.
Advantage of the present invention is:
1. the present invention connects the first second harmonic resonant network at the collector electrode of the grounded-emitter transistor of Cascode circuit structure, will amplify the second harmonic that produces through grounded-emitter transistor and be shorted to ground, has improved the linearity of power amplifier.
2. the present invention is connected with the second second harmonic resonant network at the collector electrode of Cascode circuit structure grounded-base transistor, will amplify the second harmonic that produces through grounded-base transistor and be shorted to ground, has further improved the linearity of power amplifier.
3. the present invention also is connected with the triple-frequency harmonics resonant network between the collector electrode of Cascode circuit structure grounded-base transistor and output, the collector electrode of harmonic signal reflected back grounded-base transistor, make the harmonic signal and the fundamental signal stack that reflect, form the waveform of approximate square wave, increased the angle of flow, improved the power added efficiency of power amplifier with this.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the circuit theory diagrams of common Cascode structure power amplifier;
Fig. 2 is the circuit theory diagrams of the specific embodiment of the invention.
Wherein: 1 first second harmonic resonant network; 11 first second harmonic series resonance networks; 2 second second harmonic resonant networks; 3 triple-frequency harmonics resonant networks; 4 input matching networks; 5 output matching networks; C1 first electric capacity; C2 second electric capacity; C3 the 3rd electric capacity; C4 the 4th electric capacity; L1 first inductance; L2 second inductance; L3 the 3rd inductance; L4 the 4th inductance; The Q1 grounded-emitter transistor; The Q2 grounded-base transistor.
Embodiment
Embodiment:
As shown in Figure 1, common Cascode structure power amplifier comprises a grounded-emitter transistor Q1 and a grounded-base transistor Q2, the input port IN of its intermediate power amplifier is connected to the base stage of grounded-emitter transistor Q1 through input matching network 4, the collector electrode of described grounded-emitter transistor Q1 is connected to the emitter of described grounded-base transistor Q2, bias supply VCC is connected to the collector electrode of grounded-base transistor Q2, and the collector electrode of described grounded-base transistor Q2 also is connected to the output port OUT of power amplifier through output matching network 5.
As shown in Figure 2, a kind of circuit that improves power amplifier linearity and power added efficiency of the present invention, on original common Cascode architecture basics, from the collector electrode of described grounded-emitter transistor Q1 to being connected with the first second harmonic resonant network 1 that suppresses second harmonic signal the ground; Suppress the second second harmonic resonant network 2 that second harmonic signal is exported from the collector electrode of described grounded-base transistor Q2 to being connected with the ground; From the collector electrode of described grounded-base transistor Q2 to the triple-frequency harmonics resonant network 3 that is connected with the output port harmonic signal reflected back collector electrode.
The described first second harmonic resonant network 1 comprises first inductance L 1, first capacitor C 1, second inductance L 2 and second capacitor C 2, described first inductance L 1 and first capacitor C 1 constitute the first second harmonic series resonance network 11 from the collector electrode of grounded-emitter transistor Q1 to series connection the ground, and the series connection back is in parallel with the described first second harmonic series resonance network 11 mutually for described second inductance L 2 and second capacitor C 2.
The described second second harmonic resonant network 2 comprises that collector electrode from grounded-base transistor Q2 is to the 3rd capacitor C 3 of connecting the ground and the 3rd inductance L 3.
Described triple-frequency harmonics resonant network 3 comprises from the collector electrode of grounded-base transistor Q2 to the 4th capacitor C 4 and the 4th inductance L 4 in parallel the output port of power amplifier.
Signal enters from input port IN, is amplified by grounded-emitter transistor Q1 after input matching network 4 impedance transformation.Along with the increase of input signal, grounded-emitter transistor Q1 is operated in nonlinear state, and the output signal of grounded-emitter transistor Q1 collector electrode has abundant harmonic component, makes signal that bigger distortion take place.The shared proportion maximum of second harmonic in these harmonic components.For improving the linearity, need the filtering second harmonic component, but must guarantee that simultaneously fundamental signal is not affected substantially.For addressing this problem, the present invention is provided with the first second harmonic resonant network 1.Wherein, first inductance L 1 and first capacitor C, 1 series resonance are shorted to ground to second harmonic signal in second harmonic frequency, and that has suppressed that second harmonic causes is non-linear; Second capacitor C 2, second inductance L 2 and first inductance L 1, first capacitor C, 1 parallel resonance are in fundamental frequency, for first-harmonic, the resistance value approach infinity of the first second harmonic resonant network 1, make most of fundamental signal enter grounded-base transistor Q2, have only the minute quantity fundamental signal to consume in the first second harmonic resonant network 1.The signal that enters grounded-base transistor Q2 from grounded-emitter transistor Q1 is also exported at its collector electrode and to be had the signal that enriches harmonic component after amplifying.For making output signal have the better linearity degree, the present invention is at the collector electrode of the grounded-emitter transistor Q2 second second harmonic resonant network 2 in parallel, make the 3rd inductance L 3 and the 3rd capacitor C 3 series resonances in second harmonic frequency, second harmonic signal is shorted to ground, that has suppressed that second harmonic causes is non-linear, has improved the linearity greatly.Simultaneously, the present invention's triple-frequency harmonics resonant network 3 of connecting between grounded-emitter transistor Q2 collector electrode and output matching network 5 makes the 4th inductance L 4 and the 4th capacitor C 4 parallel resonances in third harmonic frequencies.For triple-frequency harmonics, the resistance value approach infinity of triple-frequency harmonics resonant network 3, greatly the part harmonic signal can't arrive output by triple-frequency harmonics resonant network 3, is reflected back toward the collector electrode of grounded-emitter transistor Q2.For first-harmonic and triple-frequency harmonics, the resistance value of the second second harmonic resonant network 2 is not 0, so fundamental signal and harmonic signal can not be shorted to ground, both are superimposed at the collector electrode of grounded-emitter transistor Q2, be combined into the waveform of approximate square-wave form, improved the efficient of power amplifier greatly.In like manner, when triple-frequency harmonics resonant network 3 was operated in first-harmonic, impedance was not infinitely great, and fundamental signal is passed through smoothly.At last, signal is exported the waveform of near sinusoidal ripple after the output matching network impedance transformation.
To sum up, the present invention adopts resonant network 1,2,3 pairs of first-harmonics, second harmonic, triple-frequency harmonics to handle respectively, reaches first-harmonic is passed through smoothly, and second harmonic is shorted to ground, intercept the purpose that triple-frequency harmonics superposes itself and first-harmonic, improved the linearity and the power added efficiency of power amplifier.
Claims (4)
1. circuit that improves power amplifier linearity and power added efficiency, described power amplifier is by the folded Cascode structure that constitutes of grounded-emitter transistor (Q1) and grounded-base transistor (Q2) string, it is characterized in that: from the collector electrode of described grounded-emitter transistor (Q1) to being connected with the first second harmonic resonant network (1) that suppresses second harmonic signal the ground; Suppress the second second harmonic resonant network (2) that second harmonic signal is exported from the collector electrode of described grounded-base transistor (Q2) to being connected with the ground; From the collector electrode of described grounded-base transistor (Q2) to the triple-frequency harmonics resonant network (3) that is connected with the output port harmonic signal reflected back collector electrode.
2. the circuit of raising power amplifier linearity according to claim 1 and power added efficiency, it is characterized in that: the described first second harmonic resonant network (1) comprises first inductance (L1), first electric capacity (C1), second inductance (L2) and second electric capacity (C2), described first inductance (L1) and first electric capacity (C 1) constitute the first second harmonic series resonance network (11) from the collector electrode of grounded-emitter transistor (Q1) to series connection the ground, and the series connection back is in parallel with the described first second harmonic series resonance network (11) mutually for described second inductance (L2) and second electric capacity (C2).
3. the circuit of raising power amplifier linearity according to claim 1 and power added efficiency is characterized in that: the described second second harmonic resonant network (2) comprises that collector electrode from grounded-base transistor (Q2) is to the 3rd electric capacity (C3) of connecting the ground and the 3rd inductance (L3).
4. the circuit of raising power amplifier linearity according to claim 1 and power added efficiency is characterized in that: described triple-frequency harmonics resonant network (3) comprises from the collector electrode of grounded-base transistor (Q2) to the 4th electric capacity (C4) and the 4th inductance (L4) in parallel the output port of power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010160917 CN101882913A (en) | 2010-04-30 | 2010-04-30 | Circuit for improving linearity and power added efficiency of power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010160917 CN101882913A (en) | 2010-04-30 | 2010-04-30 | Circuit for improving linearity and power added efficiency of power amplifier |
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| CN101882913A true CN101882913A (en) | 2010-11-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009720A (en) * | 2014-06-16 | 2014-08-27 | 东南大学苏州研究院 | Power amplifier with efficiency improved |
| CN104836533A (en) * | 2015-05-25 | 2015-08-12 | 杭州电子科技大学 | Power amplifier and implementation method thereof |
| WO2019147666A1 (en) * | 2018-01-25 | 2019-08-01 | Cree, Inc. | Rf power amplifier with frequency selective impedance matching network |
| CN110708025A (en) * | 2019-09-30 | 2020-01-17 | 西安电子科技大学 | Power Amplifier Using Diode Compensation Capacitor |
| CN112152577A (en) * | 2020-09-14 | 2020-12-29 | 浙江金洲电子科技有限公司 | A-type power amplifier based on harmonic control |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2303410A (en) * | 1941-01-29 | 1942-12-01 | Toth Emerick | Preset frequency rejection in intermediate frequency amplifiers |
| US5300895A (en) * | 1992-10-01 | 1994-04-05 | Texas Instruments Incorporated | Method for terminating harmonics of transistors |
| JPH0946148A (en) * | 1995-07-28 | 1997-02-14 | Oki Electric Ind Co Ltd | Power amplifier |
| KR20100024179A (en) * | 2008-08-25 | 2010-03-05 | 광주과학기술원 | Cascode configured amplifier |
-
2010
- 2010-04-30 CN CN 201010160917 patent/CN101882913A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2303410A (en) * | 1941-01-29 | 1942-12-01 | Toth Emerick | Preset frequency rejection in intermediate frequency amplifiers |
| US5300895A (en) * | 1992-10-01 | 1994-04-05 | Texas Instruments Incorporated | Method for terminating harmonics of transistors |
| JPH0946148A (en) * | 1995-07-28 | 1997-02-14 | Oki Electric Ind Co Ltd | Power amplifier |
| KR20100024179A (en) * | 2008-08-25 | 2010-03-05 | 광주과학기술원 | Cascode configured amplifier |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009720A (en) * | 2014-06-16 | 2014-08-27 | 东南大学苏州研究院 | Power amplifier with efficiency improved |
| CN104836533A (en) * | 2015-05-25 | 2015-08-12 | 杭州电子科技大学 | Power amplifier and implementation method thereof |
| WO2019147666A1 (en) * | 2018-01-25 | 2019-08-01 | Cree, Inc. | Rf power amplifier with frequency selective impedance matching network |
| US10411659B2 (en) | 2018-01-25 | 2019-09-10 | Cree, Inc. | RF power amplifier with frequency selective impedance matching network |
| US10784825B2 (en) | 2018-01-25 | 2020-09-22 | Cree, Inc. | RF power amplifier with frequency selective impedance matching network |
| CN110708025A (en) * | 2019-09-30 | 2020-01-17 | 西安电子科技大学 | Power Amplifier Using Diode Compensation Capacitor |
| CN110708025B (en) * | 2019-09-30 | 2024-01-16 | 西安电子科技大学 | Power amplifier using diode compensation capacitor |
| CN112152577A (en) * | 2020-09-14 | 2020-12-29 | 浙江金洲电子科技有限公司 | A-type power amplifier based on harmonic control |
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Application publication date: 20101110 |