CN203193570U - Amplifying circuit with self-adaption combined circuit cancellation function - Google Patents
Amplifying circuit with self-adaption combined circuit cancellation function Download PDFInfo
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- CN203193570U CN203193570U CN 201320116008 CN201320116008U CN203193570U CN 203193570 U CN203193570 U CN 203193570U CN 201320116008 CN201320116008 CN 201320116008 CN 201320116008 U CN201320116008 U CN 201320116008U CN 203193570 U CN203193570 U CN 203193570U
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Abstract
The utility model discloses an amplifying circuit with a self-adaption combined circuit cancellation function. The amplifying circuit with the self-adaption combined circuit cancellation function comprises a base band pre-distortion signal processing unit, a first amplifying unit, a second amplifying unit and a combined circuit unit. The amplifying circuit further comprises a distortion signal demodulation and correction unit, a first feedback circuit and a second feedback circuit. A base band signal is transmitted to the base band pre-distortion signal processing unit through the distortion signal demodulation and correction unit. A self-adaption closed-loop system is formed through the first feedback circuit and the second feedback circuit, twice linearization compensation of the amplifying circuit is achieved, and therefore high efficiency and high linearity of the amplifying circuit are achieved.
Description
Technical field
The utility model relates to a kind of amplifying circuit, relates in particular to a kind ofly to have self adaptation and close the amplifying circuit that the road offsets function.
Background technology
Current digital pre-distortion technology is widely used at wireless communication base station system, yet along with the continuous growth of the mankind to resource requirement, efficient to mobile communication system requires also more and more higher, though traditional base band digital predistortion can improve the efficient of power amplifier with the combination of Doherty technology, yet base band predistortion also is conditional to the distortion compensation of power amplifier, only could cooperate with base band predistortion at the power amplifier that satisfies certain distortion requirement to obtain the better linearity effect.Therefore further the research power amplifier is relatively more severe in amplitude and phase distortion, is a worth problem of furtheing investigate and be combined the efficient that further improves power amplifier with corresponding cancellation techniques by base band predistortion under the efficient conditions of higher with linearity.
Summary of the invention
The purpose of this utility model is to provide a kind of to be had self adaptation and closes the amplifying circuit that the road offsets function, and this amplifier can be realized the high efficiency of the radiofrequency signal of mobile communication frequency range and high linear the amplification.
The technical scheme that its technical problem that solves the utility model adopts is:
Provide a kind of and have self adaptation and close the amplifying circuit that the road offsets function, comprise base band predistortion signal processing unit, first amplifying unit, second amplifying unit and close the road circuit unit;
Described first amplifying unit comprises the first intermediate frequency unit circuit, first mixing and radio frequency unit circuit, first amplifier, first coupler and second coupler that connects successively; This second amplifying unit comprises the second intermediate frequency unit circuit, second mixing and radio frequency unit circuit, second amplifier, the 3rd coupler and the 4th coupler that connects successively; Two outputs of described base band predistortion signal processing unit connect the described first intermediate frequency unit circuit and the described second intermediate frequency unit circuit respectively, described second coupler is connected with the described road circuit unit that closes with described the 4th coupler, and the output signal of described first amplifying unit and described second amplifying unit superposes by the described road circuit unit that closes;
This amplifying circuit also comprises distorted signal demodulation and correcting unit, first feedback circuit and second feedback circuit; Baseband signal is imported described base band predistortion signal processing unit by this distorted signal demodulation and correcting unit;
The input of described first feedback circuit connects described first coupler and described the 3rd coupler, convert baseband signal to the signal that two-way is comprised distortion and feed back to described base band predistortion signal processing unit, described base band predistortion signal processing unit carries out pre-distortion compensated to the distorted signal that comprises in the feedback signal, the signal that produces reverse distortion is sent to described first amplifying unit and described second amplifying unit respectively, so that described first amplifier and described second amplifier are carried out linear compensation;
The input of described second feedback circuit connects described second coupler and described the 4th coupler, convert baseband signal to the signal that two-way is comprised distortion and feed back to described distorted signal demodulation and correcting unit, described distorted signal demodulation and correcting unit carry out the go forward side by side adjusting of line amplitude and phase place of demodulation to distorted signal in the feedback signal, so that the error signal amplitude equal phase through remaining behind the pre-distortion compensated in described first amplifier and described second amplifier is opposite, and produce and to offset closing circuit unit place, road, realize the secondary linear compensation of described first amplifier and described second amplifier;
In the amplifying circuit described in the utility model, it is identical that described first amplifying unit and described second amplifying unit output to described main signal amplitude equal phase of closing the road circuit unit.
In the amplifying circuit described in the utility model, described first feedback circuit comprises the 3rd intermediate frequency unit circuit, the 3rd mixing and radio frequency unit circuit and first radio-frequency (RF) switch that connects successively, described first radio-frequency (RF) switch is connected with described the 3rd coupler with described first coupler, and described the 3rd intermediate frequency unit circuit is connected with described base band predistortion signal processing unit;
Described first radio-frequency (RF) switch is carried out time sharing sampling and is exported to described the 3rd mixing and radio frequency unit circuit the output signal of described first coupler and described the 3rd coupler; Described the 3rd mixing and radio frequency unit circuit are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; Described the 3rd intermediate frequency unit circuit converts the intermediate-freuqncy signal of amplifying digital signal to and exports to described base band predistortion signal processing unit.
In the amplifying circuit described in the utility model, described second feedback circuit comprises the 4th intermediate frequency unit circuit, the 4th mixing and radio frequency unit circuit and second radio-frequency (RF) switch that connects successively, described second radio-frequency (RF) switch is connected with described the 4th coupler with described second coupler, and described the 4th intermediate frequency unit circuit is connected with correcting unit with described distorted signal demodulation;
Described second radio-frequency (RF) switch is carried out time sharing sampling and is exported to described the 4th mixing and radio frequency unit circuit the output signal of described second coupler and described the 4th coupler; Described the 4th mixing and radio frequency unit circuit are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; Described the 4th intermediate frequency unit circuit converts the intermediate-freuqncy signal of amplifying digital signal to and exports to described distorted signal demodulation and correcting unit.
In the amplifying circuit described in the utility model, described first amplifier and described second amplifier are for being operated in the amplifier of any operating state in category-A, AB class, C class, D class or the E class.
In the amplifying circuit described in the utility model, described first amplifier and described second amplifier all constitute any type of power amplifier separately, perhaps constitute the Doherty power amplifier.
In the amplifying circuit described in the utility model, when first amplifier and second amplifier constituted power amplifier separately, closing the road circuit unit was little band mixer or 3dB mixer.
In the amplifying circuit described in the utility model, when first amplifier and second amplifier constituted the Doherty power amplifier, closing the road circuit unit was that Doherty closes the road circuit, comprises 1/4 wavelength line, mixer and impedance transformation line.
The beneficial effect that the utility model produces is: the base band predistortion signal processing unit in the amplifying circuit of the present utility model and distorted signal demodulation and correcting unit, form adaptive closed-loop system by first feedback circuit and second feedback circuit, realization is to twice linear compensation of amplifier, thereby realized high efficiency and the high linearity of this amplifying circuit, the efficient of peak-to-average force ratio power amplifier under the condition of 8dB can improve 3-5%.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is that the utility model embodiment has self adaptation and closes the structural representation that the road offsets the amplifying circuit of function.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the utility model embodiment has self adaptation and closes the amplifying circuit that the road offsets function and comprise: base band predistortion signal processing unit 2, first amplifying unit 21, second amplifying unit 22 and close road circuit unit 13;
First amplifying unit 21 comprises the first intermediate frequency unit circuit 3, first mixing and radio frequency unit circuit 4, first amplifier 5, first coupler 6 and second coupler 7 that connects successively; This second amplifying unit 22 comprises the second intermediate frequency unit circuit 8, second mixing and radio frequency unit circuit 9, second amplifier 10, the 3rd coupler 11 and the 4th coupler 12 that connects successively; Two outputs of base band predistortion signal processing unit 2 connect the first intermediate frequency unit circuit 3 and the second intermediate frequency unit circuit 8 respectively, second coupler 7 and the 4th coupler 12 with close road circuit unit 13 and be connected, the output signal of first amplifying unit 21 and second amplifying unit 22 is by closing 13 stacks of road circuit unit;
This amplifying circuit also comprises distorted signal demodulation and correcting unit 1, first feedback circuit 31 and second feedback circuit 32; Baseband signal is by this distorted signal demodulation and correcting unit 1 input base band predistortion signal processing unit 2;
The input of first feedback circuit 31 connects first coupler 6 and the 3rd coupler 11, convert baseband signal to the signal that two-way is comprised distortion and feed back to the base band predistortion signal processing unit, the distorted signal that comprises in 2 pairs of feedback signals of base band predistortion signal processing unit carries out pre-distortion compensated, the signal that produces reverse distortion is sent to first amplifying unit 21 and second amplifying unit 22 respectively, so that first amplifier and second amplifier are carried out linear compensation;
The input of second feedback circuit 32 connects second coupler 7 and the 4th coupler 12, convert baseband signal to the signal that two-way is comprised distortion and feed back to distorted signal demodulation and correcting unit 1, distorted signal carries out the go forward side by side adjusting of line amplitude and phase place of demodulation in 1 pair of feedback signal of distorted signal demodulation and correcting unit, in an embodiment of the present utility model, distorted signal demodulation and correcting unit 1 mainly come out to three rank in the distorted signal and five order component demodulation, then the adjusting of amplitude and phase place is carried out on three rank and five rank distorted signals, so that the error signal amplitude equal phase through remaining behind the pre-distortion compensated in first amplifier 5 and second amplifier 10 is opposite, and produce and to offset closing road circuit unit 13 places, realize the secondary linear compensation of first amplifier 5 and second amplifier 10;
In an embodiment of the present utility model, can make first amplifying unit 21 identical with the second amplifying unit 22 main signal amplitude equal phase of closing road circuit unit 13 that outputs to by circuit adjustment.
Make amplifying circuit of the present utility model form an adaptive closed-loop system by first feedback circuit 31 and second feedback circuit 32.
As shown in Figure 1, particularly, the baseband signal that is input to this amplifying circuit is input to the input D1 of distorted signal demodulation and correcting unit 1, the distorted signal demodulation is connected the input D3 of base band predistortion signal processing unit 2 with the output D2 of correcting unit 1, first output terminals A 1 of base band predistortion signal processing unit 2 connects the input A2 of the first intermediate frequency unit circuit 3, the output terminals A 3 of the first intermediate frequency unit circuit 3 connects the input A4 of first mixing and radio frequency unit circuit 4, first mixing is connected the input A6 of first amplifier 5 with radio frequency unit circuit 4 output terminals A 5, the output terminals A 7 of first amplifier 5 connects the input A8 of first coupler 6, the output terminals A 9 of first coupler 6 connects the input A10 of second coupler 7, and the output terminals A 11 of second coupler 7 connects the first input end A12 that closes road circuit unit 13.The first intermediate frequency unit circuit 3 is realized digital signal to the conversion of analog signal, and first mixing and radio frequency unit circuit 4 realize that intermediate-freuqncy signal is to the conversion of radiofrequency signal and the enlarging function of radiofrequency signal.
The second output B1 of base band predistortion signal processing unit 2 connects the input B2 of the second intermediate frequency unit circuit 8, the output B3 of the second intermediate frequency unit circuit 8 connects the input B4 of second mixing and radio frequency unit circuit 9, second mixing is connected the input B6 of second amplifier 10 with radio frequency unit circuit 9 output B5, the output B7 of second amplifier 10 connects the input B8 of the 3rd coupler 11, the output B9 of the 3rd coupler 11 connects the input B10 of the 4th coupler 12, the output B11 of the 4th coupler 12 connects the second input B12 that closes road circuit unit 13, the signal of second input B12 input superposes with the signal that is input to first input end A12, error signal wherein is because the phase place opposite magnitude is equal, can realize offseting, and by closing the output D4 output of road circuit unit 13.The second intermediate frequency unit circuit 8 is realized digital signal to the conversion of analog signal, and second mixing and radio frequency unit circuit 9 realize that intermediate-freuqncy signal is to the conversion of radiofrequency signal and the enlarging function of radiofrequency signal.
Among the embodiment of the present utility model, first feedback circuit 31 comprises the 3rd intermediate frequency unit circuit 14, the 3rd mixing and radio frequency unit circuit 15 and first radio-frequency (RF) switch 16 that connects successively, first radio-frequency (RF) switch 16 is connected with the 3rd coupler with first coupler, and the 3rd intermediate frequency unit circuit 14 is connected with base band predistortion signal processing unit 2.
The coupled end C1 of first coupler 6 connects the first input end C2 of first radio-frequency (RF) switch 16, the coupled end C3 of the 3rd coupler 11 connects the second input C4 of first radio-frequency (RF) switch 16, the output C5 of first radio-frequency (RF) switch 16 connects the input C6 of the 3rd mixing and radio frequency unit circuit 15, the output C7 of the 3rd mixing and radio frequency unit circuit 15 is connected the input C8 of the 3rd intermediate frequency unit circuit 14, and the output C9 of the 3rd intermediate frequency unit circuit 14 connects the feedback end C10 of base band predistortion signal processing unit 2.
The output signal of 16 pairs of first couplers 6 of first radio-frequency (RF) switch and the 3rd coupler 11 is carried out time sharing sampling and is exported to the 3rd mixing and radio frequency unit circuit 15; The 3rd mixing and radio frequency unit circuit 15 are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; The 3rd intermediate frequency unit circuit 14 converts the intermediate-freuqncy signal of amplifying digital signal to and exports to base band predistortion signal processing unit 2.
Among the embodiment of the present utility model, second feedback circuit 32 comprises the 4th intermediate frequency unit circuit 17, the 4th mixing and radio frequency unit circuit 18 and second radio-frequency (RF) switch 19, second radio-frequency (RF) switch 19 is connected with the 4th coupler 12 with second coupler 7, and the 4th intermediate frequency unit circuit 17 is connected with correcting unit 1 with the distorted signal demodulation;
The coupled end E1 of second coupler 7 connects the first input end E2 of second radio-frequency (RF) switch 19, the coupled end E3 of the 4th coupler 12 connects the second input E4 of second radio-frequency (RF) switch 19, the output E5 of second radio-frequency (RF) switch 19 connects the input E6 of the 4th mixing and radio frequency unit circuit 18, the output E7 of the 4th mixing and radio frequency unit circuit 18 is connected the input E8 of the 4th intermediate frequency unit circuit 17, the distorted signal demodulation that the output E9 of the 4th intermediate frequency unit circuit 17 connects and the feedback end E10 of correcting unit 1.
The output signal of 19 pairs of second couplers 7 of second radio-frequency (RF) switch and the 4th coupler 12 is carried out time sharing sampling and is exported to the 4th mixing and radio frequency unit 18 circuit; The 4th mixing and radio frequency unit circuit 18 are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; The 4th intermediate frequency unit circuit 17 converts the intermediate-freuqncy signal of amplifying digital signal to and exports to the distorted signal demodulation and correcting unit 1.
Wherein, first amplifier 5 and second amplifier 10 can be operated in any operating state in category-A, AB class, C class, D class, the E class.
First amplifier 5 can work in identical operating state with second amplifier 10 also can work in different states, first amplifier 5 and second amplifier 10 can constitute the Doherty power amplifier altogether, also can constitute any type of power amplifier separately.
Further, close road circuit unit 13 two kinds of implementations are arranged, when first amplifier 5 and second amplifier 10 constitute power amplifier separately, close the road of closing that road circuit unit 13 is realized simple two-way power, closing road circuit unit 13 can be that little band mixer, 3dB mixer wait to realize.
Further, when first amplifier 5 and second amplifier 10 constituted the Doherty power amplifier, the realization of closing road circuit unit 13 can comprise 1/4 wavelength line, mixer and impedance transformation line, for typical Doherty closes the road circuit.
The utility model amplifying circuit is by sampling to the output of first amplifier 5 and second amplifier 10, then sampled signal is changed to baseband signal by mixting circuit and intermediate-frequency circuit, the signal of two-way power amplifier carries out the digital pre-distortion processing respectively in baseband signal, then at first coupler 6, the output of the 3rd coupler 11 arrives base band with the signal coupling transform respectively, phase place and amplitude at 1 pair of distorted signal of distorted signal solution mediation correcting unit are regulated, making the signal of win amplifying unit 21 and the output of second amplifying unit 22 possess amplitude equates, every like this road amplifying unit is except having carried out the digital pre-distortion processing, can carry out secondary and close the road and offset closing road circuit unit 13 places simultaneously, thereby obtain the favorable linearity effect.
The utility model has been realized twice linear compensation of power amplifier, thereby make this amplifying circuit improve greatly with respect to traditional amplifier offset ability, just relative much lower to the requirement of the AM-AM of power amplifier and AM-PM distortion curve like this, thereby make can aspect efficient, more being promoted of power amplifier, finally realize the high efficiency of this amplifying circuit and high linear.The efficient of power amplifier can reach 45-55%.Concrete efficient is relevant with the power output of the peak-to-average force ratio that is exaggerated signal and power amplifier, power amplifier is 20MHz at effective bandwidth of operation, the carrier wave of signal can dispose arbitrarily in the 20MHz bandwidth of operation, amplify for the high linear of maximum 12 carrier waves of GSM signal, under this condition IM3 can reach-more than the 65dBc.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (7)
1. one kind has self adaptation and closes the amplifying circuit that the road offsets function, it is characterized in that, comprises base band predistortion signal processing unit (2), first amplifying unit (21), second amplifying unit (22) and closes road circuit unit (13);
Described first amplifying unit (21) comprises the first intermediate frequency unit circuit (3), first mixing and radio frequency unit circuit (4), first amplifier (5), first coupler (6) and second coupler (7) that connects successively; This second amplifying unit (22) comprises the second intermediate frequency unit circuit (8), second mixing and radio frequency unit circuit (9), second amplifier (10), the 3rd coupler (11) and the 4th coupler (12) that connects successively; Two outputs of described base band predistortion signal processing unit (2) connect the described first intermediate frequency unit circuit (3) and the described second intermediate frequency unit circuit (8) respectively, described second coupler (7) is connected with the described road circuit unit (13) that closes with described the 4th coupler (12), and the output signal of described first amplifying unit (21) and described second amplifying unit (22) superposes by the described road circuit unit (13) that closes;
This amplifying circuit also comprises distorted signal demodulation and correcting unit (1), first feedback circuit (31) and second feedback circuit (32); Baseband signal is by this distorted signal demodulation and correcting unit (1) input described base band predistortion signal processing unit (2);
The input of described first feedback circuit (31) connects described first coupler (6) and described the 3rd coupler (11), convert baseband signal to the signal that two-way is comprised distortion and feed back to described base band predistortion signal processing unit (2), described base band predistortion signal processing unit (2) carries out pre-distortion compensated to the distorted signal that comprises in the feedback signal, the signal that produces reverse distortion is sent to described first amplifying unit (21) and described second amplifying unit (22) respectively, so that described first amplifier (5) and described second amplifier (10) are carried out linear compensation;
The input of described second feedback circuit (32) connects described second coupler (7) and described the 4th coupler (12), convert baseband signal to the signal that two-way is comprised distortion and feed back to described distorted signal demodulation and correcting unit (1), described distorted signal demodulation and correcting unit (1) carry out the go forward side by side adjusting of line amplitude and phase place of demodulation to distorted signal in the feedback signal, so that the error signal amplitude equal phase through remaining behind the pre-distortion compensated in described first amplifier (5) and described second amplifier (10) is opposite, and locate to produce and offset closing road circuit unit (13), realize the secondary linear compensation of described first amplifier (5) and described second amplifier (10).
2. amplifying circuit according to claim 1, it is characterized in that, described first feedback circuit (31) comprises the 3rd intermediate frequency unit circuit (14), the 3rd mixing and radio frequency unit circuit (15) and first radio-frequency (RF) switch (16) that connects successively, described first radio-frequency (RF) switch (16) is connected with described the 3rd coupler (11) with described first coupler (6), and described the 3rd intermediate frequency unit circuit (14) is connected with described base band predistortion signal processing unit (2);
Described first radio-frequency (RF) switch (16) is carried out time sharing sampling and is exported to described the 3rd mixing and radio frequency unit circuit (15) the output signal of described first coupler (6) and described the 3rd coupler (11); Described the 3rd mixing and radio frequency unit circuit (15) are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; Described the 3rd intermediate frequency unit circuit (14) converts the intermediate-freuqncy signal of amplifying digital signal to and exports to described base band predistortion signal processing unit (2).
3. amplifying circuit according to claim 1, it is characterized in that, described second feedback circuit (32) comprises the 4th intermediate frequency unit circuit (17), the 4th mixing and radio frequency unit circuit (18) and second radio-frequency (RF) switch (19) that connects successively, described second radio-frequency (RF) switch (19) is connected with described the 4th coupler (12) with described second coupler (7), and described the 4th intermediate frequency unit circuit (17) is connected with correcting unit (1) with described distorted signal demodulation;
Described second radio-frequency (RF) switch (19) is carried out time sharing sampling and is exported to described the 4th mixing and radio frequency unit circuit (18) the output signal of described second coupler (7) and described the 4th coupler (12); Described the 4th mixing and radio frequency unit circuit (18) are converted to intermediate-freuqncy signal with radiofrequency signal and amplify; Described the 4th intermediate frequency unit circuit (17) converts the intermediate-freuqncy signal of amplifying digital signal to and exports to described distorted signal demodulation and correcting unit (1).
4. amplifying circuit according to claim 1 is characterized in that, described first amplifier (5) and described second amplifier (10) are for being operated in the amplifier of any operating state in category-A, AB class, C class, D class or the E class.
5. amplifying circuit according to claim 1 is characterized in that, described first amplifier (5) and described second amplifier (10) all constitute any type of power amplifier separately, perhaps constitute the Doherty power amplifier.
6. amplifying circuit according to claim 5 is characterized in that, when first amplifier (5) and second amplifier (10) when constituting power amplifier separately, closing road circuit unit (13) is little band mixer or 3dB mixer.
7. amplifying circuit according to claim 5, it is characterized in that, when first amplifier (5) and second amplifier (10) constitute the Doherty power amplifier, close road circuit unit (13) for Doherty closes the road circuit, comprise 1/4 wavelength line, mixer and impedance transformation line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320116008 CN203193570U (en) | 2013-03-14 | 2013-03-14 | Amplifying circuit with self-adaption combined circuit cancellation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320116008 CN203193570U (en) | 2013-03-14 | 2013-03-14 | Amplifying circuit with self-adaption combined circuit cancellation function |
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| Publication Number | Publication Date |
|---|---|
| CN203193570U true CN203193570U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320116008 Withdrawn - After Issue CN203193570U (en) | 2013-03-14 | 2013-03-14 | Amplifying circuit with self-adaption combined circuit cancellation function |
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| CN (1) | CN203193570U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199797A (en) * | 2013-03-14 | 2013-07-10 | 武汉正维电子技术有限公司 | Amplifying circuit with self-adaptive combining cancellation function |
-
2013
- 2013-03-14 CN CN 201320116008 patent/CN203193570U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199797A (en) * | 2013-03-14 | 2013-07-10 | 武汉正维电子技术有限公司 | Amplifying circuit with self-adaptive combining cancellation function |
| CN103199797B (en) * | 2013-03-14 | 2016-03-09 | 武汉正维电子技术有限公司 | There is self adaptation and close the amplifying circuit that road offsets function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130911 Effective date of abandoning: 20160309 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |