CN104104335A - Method for widening video bandwidths of doherty power amplifiers in TDD (time division duplex) modes and video bandwidth enhancing power amplifier - Google Patents
Method for widening video bandwidths of doherty power amplifiers in TDD (time division duplex) modes and video bandwidth enhancing power amplifier Download PDFInfo
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Abstract
The invention relates to a method for widening video bandwidths of doherty power amplifiers in TDD (time division duplex) modes and a video bandwidth enhancing power amplifier. The video bandwidth enhancing power amplifier comprises a drive-stage power amplifier and a last-stage power amplifier. The drive-stage power amplifier comprises a gate voltage supply network a, a drain voltage supply network a, a power distribution network a, a combining network, a drive power amplifier a and a drive power amplifier b, and the gate voltage supply network a comprises a gate voltage bias circuit a, a gate voltage bias circuit b, a video bandwidth enhancing network a and a video bandwidth enhancing network b. The method and the video bandwidth enhancing power amplifier have the advantages that the efficiency of the power amplifier can be greatly improved, resistance and capacitance values of video bandwidth enhancing networks are properly selected, accordingly, the video bandwidths of the doherty power amplifiers can be effectively improved, and linear indexes of the doherty power amplifiers can be obviously improved when the doherty power amplifiers are applied to the same digital pre-distortion platforms in the TDD modes.
Description
Technical field
The invention belongs to moving communicating field, relate in particular to a kind of method and video bandwidth of widening the doherty power amplifier video bandwidth under tdd mode and strengthen amplifirer.
Background technology
Equipment in current mobile communication system is all towards miniaturization, integrated, and energy-saving development, the especially target of energy-saving require more and more stricter to the low-power consumption of communication equipment.In base station equipment or base station sub-system relevant device, the power consumption of power amplifier module can account for 60% left and right of Overall Power Consumption, so improve the efficiency of power amplifier module, to reducing Overall Power Consumption, has played vital effect.Another outer aspect, in the mobile communication system of tdd mode, what base station was used to the up and downlink communication between user's mobile device is the different time-gap of same frequency channels, with separated reception of time and transmitting channel.The mode of operation that is applied to the power amplifier of tdd mode is: descending in opening operating state, up in closed condition, i.e. and up-downgoing switch mode.The time interval of uplink and downlink works will meet the time slot allocation requirement of base station system, and while guaranteeing up work, downstream signal is closed.
Doherty technology can effectively improve the efficiency of power amplifier, but its linear index can worsen thereupon, so meeting and various pre-distortion technologies conventionally, particularly digital pre-distortion technology is used in combination.When yet traditional doherty power amplifier and digital pre-distortion technology are used in combination, owing to being subject to the constraint of the video bandwidth of doherty power amplifier, cause linear index to improve limited.Especially work in the doherty power amplifier under tdd mode, because operating state meets the requirement of up-downgoing handover delay, linear index can with descending normal on-mode under have the deterioration of 1～2dB.
Summary of the invention
In doherty power amplifier and digital pre-distortion platform, because the video bandwidth of doherty power amplifier can have influence on the effect of digital pre-distortion, narrower video bandwidth can cause digital pre-distortion effect not good enough, so the present invention has accessed respectively video bandwidth enhancing network at the grid and the drain electrode power pack that promote level power amplifier and final stage power amplifier.Consider in the mobile communications network that is applied to tdd mode simultaneously, so the resistance of resistance that video bandwidth enhancing network is used and the capacitance of electric capacity have been made scope, confine.By choosing suitable capacitance-resistance value, can effectively improve the video bandwidth of doherty power amplifier, thereby improve the improvement amount of the doherty power amplifier linear index in same TDD digital pre-distortion platform.Meanwhile, the delivery efficiency while adopting symmetrical doherty power amplifier greatly to improve power amplifier rollback 7dB, and final stage power amplifier adopts is the power tube of same model, so the characteristic consistency of power amplifier can guarantee to some extent.
The object of the invention is to overcome the deficiency that prior art exists, and provide a kind of method and video bandwidth of widening the doherty power amplifier video bandwidth under tdd mode to strengthen amplifirer, it can effectively improve the efficiency of radio-frequency power amplifier.Simultaneously by improving the video bandwidth of doherty power amplifier, make it to work in tdd mode lower time, coordinate linear index can improve 6～8dB with same digital pre-distortion technology platform.
The object of the invention is to complete by following technical solution.This video bandwidth strengthens amplifirer, and described video bandwidth strengthens amplifirer and comprises promotion level amplifirer and final stage power amplifier device, and wherein, promoting level amplifirer is balanced type power amplifier structure, and described final stage power amplifier device is doherty power amplifier structure; Described promotion level amplifirer is mainly pressed supply network a, power distributing network a, closes road network network, promotes power amplifier a and promotes power amplifier b to form by grid voltage supply network a, leakage, wherein, described grid voltage supply network a mainly strengthens network b by grid voltage biasing circuit a, grid voltage biasing circuit b, video bandwidth enhancing network a and video bandwidth and forms, and described leakage presses supply network a mainly by leakage, to press biasing circuit a, leakage to press biasing circuit b, video bandwidth to strengthen network c and video bandwidth enhancing network d forms; Described final stage power amplifier device mainly presses supply network b, power distributing network b, impedance transformation to close road network network, carrier power amplifier a and peak value power amplifier a and form by grid voltage supply network b, leakage, described grid voltage supply network b mainly strengthens network f by grid voltage biasing circuit c, grid voltage biasing circuit d, video bandwidth enhancing network e and video bandwidth and forms, and described leakage presses supply network b mainly by leakage, to press biasing circuit c, leakage to press biasing circuit d, video bandwidth to strengthen network g and video bandwidth enhancing network h forms; The described link of realizing that promotes level amplifirer comprises: described power distributing network a realizes Jiang Yi road radio-frequency input signals and is divided into the synchronous radio frequency output signal of two-way constant power, an one output is connected with the input that promotes power amplifier a, and another output is connected with the input that promotes power amplifier b; The described road network network that closes, realizes the synthetic road radiofrequency signal output of the radio-frequency input signals of two branch roads, and an one input is connected with the output that promotes power amplifier a, and another input is connected with the output that promotes power amplifier b; The grid voltage power pack of described promotion power amplifier a strengthens network a by grid voltage biasing circuit a, video bandwidth to be realized, and the grid voltage power pack of described promotion power amplifier b strengthens network b by grid voltage biasing circuit b, video bandwidth to be realized; The drain voltage power pack of described promotion power amplifier a presses biasing circuit a, video bandwidth enhancing network c to realize by leaking, and the drain voltage power pack of described promotion power amplifier b presses biasing circuit b, video bandwidth enhancing network d to realize by leaking; The link of realizing of described final stage power amplifier device comprises: described power distributing network b realizes that Jiang Yi road radio-frequency input signals is divided into two-way constant power and phase difference is the radiofrequency signal output of 90 degree, its 3dB electric bridge by corresponding band is realized, at the resistance of 50 ohm of isolation end serial connections, do and isolate, the 0 degree phase shifter output terminal of described power distributing network b is connected with the input of described carrier power amplifier, and 90 degree phase shifter output terminals are connected with the input of described peak value power amplifier; The output of the output of carrier power amplifier and peak value power amplifier is connected with impedance transformation and two inputs closing road network network respectively, described impedance transformation and close road network network the output signal of carrier power amplifier and peak value power amplifier is closed to road, and play the effect of impedance variation; The grid voltage power pack of described carrier power amplifier strengthens network e by grid voltage biasing circuit c, video bandwidth to be realized; The grid voltage power pack of described peak value power amplifier strengthens network f by grid voltage biasing circuit d, video bandwidth to be realized; The drain voltage power pack of described carrier power amplifier presses biasing circuit c, video bandwidth enhancing network g to realize by leaking; The drain voltage power pack of described peak value power amplifier presses biasing circuit d, video bandwidth to strengthen network h realization by leaking.
As preferably, described power distributing network a, power distributing network b realize by wideband microband Wilkinson merit parallel circuit, and 100 Ohmic resistances of a suitable power grade in parallel between its two branch road outputs, to isolate two-way output signal.
As preferably, described in close road network ruton and cross wideband microband Wilkinson merit parallel circuit and realize, 100 Ohmic resistances that can a suitable power grade in parallel between the input of its two branch roads, to isolate two-way input signal; Described impedance transformation and close road network network, its output signal by carrier power amplifier and peak value power amplifier is closed road, and plays the effect of impedance variation; At input signal hour, peak value power amplifier is output into open-circuit condition, now by impedance transformer network, the output impedance of carrier power amplifier is transformed to 100 ohm; While increasing to certain value along with input signal, peak value power amplifier is output into saturation condition, now by impedance transformer network, the output impedance of carrier power amplifier is transformed to 50 ohm.
As preferably, described promotion power amplifier a and promote in parallel realization of LDMOS power tube that power amplifier b is used two discrete same models, or use a LDMOS power tube, it the is inner integrated power amplifier unit of two same units; Described promotion power amplifier a and promotion power amplifier b are operated in category-B biasing, are meeting the efficiency that improves promotion level amplifirer under linear condition; It strengthens electric capacity and the resistance in network b, video bandwidth enhancing network c, video bandwidth enhancing network d by suitable selecting video bandwidth enhancement network a, video bandwidth, strengthens the video bandwidth that promotes level amplifirer, meets the switching demand under tdd mode simultaneously.
As preferably, described carrier power amplifier and peak value power amplifier are used that the LDMOS power tube of two discrete same models is in parallel to be realized, or use a LDMOS power tube, it the is inner integrated power amplifier unit of two same units; Described carrier power amplifier is operated in the biasing of AB class, and its peak work is put and is operated in the biasing of C class, and it adopts symmetrical Doherty structure, efficiency when raising final stage power amplifier device is exported from saturation power point rollback 7dB; It strengthens electric capacity and the resistance of network f by suitable selecting video bandwidth enhancement network e, video bandwidth, suitable selecting video bandwidth enhancement network g, video bandwidth strengthen the electric capacity in network h, the video bandwidth that strengthens final stage power amplifier device meets the switching demand under tdd mode simultaneously.
As preferably, described grid voltage biasing circuit a, grid voltage biasing circuit b, grid voltage biasing circuit c, grid voltage biasing circuit d are comprised of some resistance connection in series-parallel, wherein, grid voltage biasing circuit a, grid voltage biasing circuit b offer supply power voltage and promote the required grid operating voltage of level amplifirer after dividing potential drop; Grid voltage biasing circuit c, grid voltage biasing circuit d offer the required grid operating voltage of final stage power amplifier device by supply power voltage through dividing potential drop; Described leakage is pressed biasing circuit a, is leaked and press biasing circuit b, leakage to press biasing circuit c, leak and press biasing circuit d to be comprised of magnetic bead, the connection in series-parallel of electrochemical capacitor related device; Wherein, described leakage is pressed biasing circuit a, is leaked and press biasing circuit b to offer the required drain electrode operating voltage stable, that ripple is little of promotion level amplifirer; Described leakage is pressed biasing circuit c, is leaked and press biasing circuit d to offer the required drain electrode operating voltage stable, that ripple is little of final stage power amplifier device.
As preferably, described video bandwidth strengthens network a, video bandwidth strengthens network b, video bandwidth enhancing network e, video bandwidth enhancing network f, its Capacitance parallel connection by least two different magnitude capacitances resistance of connecting again forms, the electric capacity magnitude of its large capacitance is sodium method (nF) magnitude, and resistance scope is between 10-100 Europe; Described video bandwidth strengthens network c, and video bandwidth strengthens network d, and video bandwidth strengthens network g, and video bandwidth strengthens network h, and its Capacitance parallel connection by least two different magnitude capacitances forms, and the electric capacity magnitude of its maximum capacitance is microfarad magnitude.
The method of widening the doherty power amplifier video bandwidth under tdd mode of the present invention, the method comprises:
1) adopt video bandwidth to strengthen amplifirer, it comprises promotion level amplifirer and final stage power amplifier device, and wherein, promoting level amplifirer is balanced type power amplifier structure, and described final stage power amplifier device is doherty power amplifier structure;
2) the described promotion power amplifier that promotes level amplifirer is all operated in category-B biasing, by electric capacity and resistance in suitable selecting video bandwidth enhancement network, is used for strengthening the described video bandwidth that promotes level amplifirer, meets the switching demand under tdd mode simultaneously;
3) carrier power amplifier in described final stage power amplifier device is operated in the biasing of AB class, its peak work is put and is operated in the biasing of C class, by electric capacity and resistance in suitable selecting video bandwidth enhancement network, be used for strengthening the video bandwidth of described final stage power amplifier device, meet the switching demand under tdd mode simultaneously.
As preferably, described video bandwidth strengthens network and mainly by video bandwidth enhancing network a, video bandwidth enhancing network b, video bandwidth enhancing network c, video bandwidth enhancing network d, video bandwidth, strengthens network e, video bandwidth enhancing network f, video bandwidth enhancing network g, video bandwidth enhancing network h composition; Described video bandwidth strengthens network a, video bandwidth and strengthens that network b, video bandwidth strengthen network e, video bandwidth strengthens network f, and its Capacitance parallel connection by least two different magnitude capacitances resistance of connecting again forms; Described video bandwidth strengthens network a, video bandwidth strengthens network b, video bandwidth enhancing network e, video bandwidth enhancing network f, and the electric capacity magnitude of its large capacitance is sodium method (nF) magnitude, and resistance scope is between 10-100 Europe; Described video bandwidth strengthens network c, video bandwidth strengthens network d, video bandwidth enhancing network g, video bandwidth enhancing network h, and its Capacitance parallel connection by least two different magnitude capacitances forms, and the electric capacity magnitude of maximum capacitance is microfarad magnitude.
Beneficial effect of the present invention is: when the present invention can improve efficiency power amplifier greatly, by the capacitance-resistance value in suitable selecting video bandwidth enhancement network, effectively improved the video bandwidth of doherty power amplifier, the linear index while making digital pre-distortion platform that it is applied to same tdd mode has obtained significant raising.
Accompanying drawing explanation
Fig. 1 is system principle diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done to detailed introduction:
As shown in Figure 1, the invention discloses a kind of for the video bandwidth enhancing amplifirer under tdd mode, it comprises promotion level amplifirer and final stage power amplifier device, described promotion level amplifirer adopts balanced type power amplifier structure, it is by grid voltage supply network a, leak and press supply network a, power distributing network a, close road network network, promote power amplifier a and promote power amplifier b to form, wherein, described grid voltage supply network a is by grid voltage biasing circuit a, grid voltage biasing circuit b, video bandwidth strengthens network a, video bandwidth strengthens network b and forms, described leakage presses supply network a to press biasing circuit a by leaking, leak and press biasing circuit b, video bandwidth strengthens network c, video bandwidth strengthens network d and forms, described final stage power amplifier device presses supply network b, power distributing network b, impedance transformation to close road network network, carrier power amplifier a and peak value power amplifier a and form by grid voltage supply network b, leakage, described grid voltage supply network b is comprised of grid voltage biasing circuit c, grid voltage biasing circuit d, video bandwidth enhancing network e, video bandwidth enhancing network f, and described leakage presses supply network b to press biasing circuit c, leakage pressure biasing circuit d, video bandwidth enhancing network g, video bandwidth to strengthen network h and form by leaking.
Wherein, the link of realizing that promotes level amplifirer comprises: described power distributing network a realizes Jiang Yi road radio-frequency input signals and is divided into the synchronous radio frequency output signal of two-way constant power, an one output is connected with the input that promotes power amplifier a, and another output is connected with the input that promotes power amplifier b; The described road network network that closes, realization is by the synthetic road radiofrequency signal output of the radio-frequency input signals of two branch roads, it is realized by micro-band Wilkinson merit parallel circuit, and an one input is connected with the output that promotes power amplifier a, and another input is connected with the output that promotes power amplifier b; The grid voltage power pack of described promotion power amplifier a strengthens network a by grid voltage biasing circuit a, video bandwidth to be realized, and the grid voltage power pack of described promotion power amplifier b strengthens network b by grid voltage biasing circuit b, video bandwidth to be realized; The drain voltage power pack of described promotion power amplifier a presses biasing circuit a, video bandwidth enhancing network c to realize by leaking, and the drain voltage power pack of described promotion power amplifier b presses biasing circuit b, video bandwidth enhancing network d to realize by leaking.
Wherein, the link of realizing of described final stage power amplifier device comprises: described power distributing network b realizes that Jiang Yi road radio-frequency input signals is divided into two-way constant power and phase difference is the radiofrequency signal output of 90 degree, its 3dB electric bridge by corresponding band is realized, at the resistance of 50 ohm of isolation end serial connections, do and isolate, the 0 degree phase shifter output terminal of described power distributing network b is connected with the input of described carrier power amplifier, and 90 degree phase shifter output terminals are connected with the input of described peak value power amplifier; The output of the output of carrier power amplifier and peak value power amplifier is connected with impedance transformation and two inputs closing road network network respectively, described impedance transformation and close road network network the output signal of carrier power amplifier and peak value power amplifier is closed to road, and play the effect of impedance variation; The grid voltage power pack of described carrier power amplifier strengthens network e by grid voltage biasing circuit c, video bandwidth to be realized; The grid voltage power pack of described peak value power amplifier strengthens network f by grid voltage biasing circuit d, video bandwidth to be realized; The drain voltage power pack of described carrier power amplifier presses biasing circuit c, video bandwidth enhancing network g to realize by leaking; The drain voltage power pack of described peak value power amplifier presses biasing circuit d, video bandwidth to strengthen network h realization by leaking.
The present invention is when greatly improving efficiency power amplifier, by the capacitance-resistance value in suitable selecting video bandwidth enhancement network, as table 1, shown in table 2, in the present embodiment, by video bandwidth being strengthened to network e, video bandwidth enhancing network f, video bandwidth enhancing network g, the resistance of video bandwidth enhancing network h and the value of electric capacity, effectively improved the video bandwidth of doherty power amplifier, the linear index (ACPR value) while making digital pre-distortion platform that it is applied to same tdd mode has obtained significant raising.
Table 1 video bandwidth strengthens network e and the improvement of f to ACPR
Table 2 video bandwidth strengthens network g and the improvement of h to ACPR
The above, be only the good execution mode of the present invention, do not form limiting the scope of the present invention.Any modification of doing within spirit of the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (9)
1. video bandwidth strengthens an amplifirer, it is characterized in that: described video bandwidth strengthens amplifirer and comprises promotion level amplifirer and final stage power amplifier device, and wherein, promoting level amplifirer is balanced type power amplifier structure, and described final stage power amplifier device is doherty power amplifier structure; Described promotion level amplifirer is mainly pressed supply network a, power distributing network a, closes road network network, promotes power amplifier a and promotes power amplifier b to form by grid voltage supply network a, leakage, wherein, described grid voltage supply network a mainly strengthens network b by grid voltage biasing circuit a, grid voltage biasing circuit b, video bandwidth enhancing network a and video bandwidth and forms, and described leakage presses supply network a mainly by leakage, to press biasing circuit a, leakage to press biasing circuit b, video bandwidth to strengthen network c and video bandwidth enhancing network d forms; Described final stage power amplifier device mainly presses supply network b, power distributing network b, impedance transformation to close road network network, carrier power amplifier a and peak value power amplifier a and form by grid voltage supply network b, leakage, described grid voltage supply network b mainly strengthens network f by grid voltage biasing circuit c, grid voltage biasing circuit d, video bandwidth enhancing network e and video bandwidth and forms, and described leakage presses supply network b mainly by leakage, to press biasing circuit c, leakage to press biasing circuit d, video bandwidth to strengthen network g and video bandwidth enhancing network h forms; The described link of realizing that promotes level amplifirer comprises: described power distributing network a realizes Jiang Yi road radio-frequency input signals and is divided into the synchronous radio frequency output signal of two-way constant power, an one output is connected with the input that promotes power amplifier a, and another output is connected with the input that promotes power amplifier b; The described road network network that closes, realizes the synthetic road radiofrequency signal output of the radio-frequency input signals of two branch roads, and an one input is connected with the output that promotes power amplifier a, and another input is connected with the output that promotes power amplifier b; The grid voltage power pack of described promotion power amplifier a strengthens network a by grid voltage biasing circuit a, video bandwidth to be realized, and the grid voltage power pack of described promotion power amplifier b strengthens network b by grid voltage biasing circuit b, video bandwidth to be realized; The drain voltage power pack of described promotion power amplifier a presses biasing circuit a, video bandwidth enhancing network c to realize by leaking, and the drain voltage power pack of described promotion power amplifier b presses biasing circuit b, video bandwidth enhancing network d to realize by leaking; The link of realizing of described final stage power amplifier device comprises: described power distributing network b realizes that Jiang Yi road radio-frequency input signals is divided into two-way constant power and phase difference is the radiofrequency signal output of 90 degree, its 3dB electric bridge by corresponding band is realized, at the resistance of 50 ohm of isolation end serial connections, do and isolate, the 0 degree phase shifter output terminal of described power distributing network b is connected with the input of described carrier power amplifier, and 90 degree phase shifter output terminals are connected with the input of described peak value power amplifier; The output of the output of carrier power amplifier and peak value power amplifier is connected with impedance transformation and two inputs closing road network network respectively, described impedance transformation and close road network network the output signal of carrier power amplifier and peak value power amplifier is closed to road, and play the effect of impedance variation; The grid voltage power pack of described carrier power amplifier strengthens network e by grid voltage biasing circuit c, video bandwidth to be realized; The grid voltage power pack of described peak value power amplifier strengthens network f by grid voltage biasing circuit d, video bandwidth to be realized; The drain voltage power pack of described carrier power amplifier presses biasing circuit c, video bandwidth enhancing network g to realize by leaking; The drain voltage power pack of described peak value power amplifier presses biasing circuit d, video bandwidth to strengthen network h realization by leaking.
2. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described power distributing network a, power distributing network b realize by wideband microband Wilkinson merit parallel circuit, 100 Ohmic resistances of a suitable power grade in parallel between its two branch road outputs, to isolate two-way output signal.
3. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described in close road network ruton and cross wideband microband Wilkinson merit parallel circuit and realize, 100 Ohmic resistances that can a suitable power grade in parallel between the input of its two branch roads, to isolate two-way input signal; Described impedance transformation and close road network network, its output signal by carrier power amplifier and peak value power amplifier is closed road, and plays the effect of impedance variation; At input signal hour, peak value power amplifier is output into open-circuit condition, now by impedance transformer network, the output impedance of carrier power amplifier is transformed to 100 ohm; While increasing to certain value along with input signal, peak value power amplifier is output into saturation condition, now by impedance transformer network, the output impedance of carrier power amplifier is transformed to 50 ohm.
4. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described promotion power amplifier a and in parallel realization of LDMOS power tube that promotes two discrete same models of power amplifier b use, or use a LDMOS power tube, it the is inner integrated power amplifier unit of two same units; Described promotion power amplifier a and promotion power amplifier b are operated in category-B biasing, are meeting the efficiency that improves promotion level amplifirer under linear condition; It strengthens electric capacity and the resistance in network b, video bandwidth enhancing network c, video bandwidth enhancing network d by suitable selecting video bandwidth enhancement network a, video bandwidth, strengthens the video bandwidth that promotes level amplifirer, meets the switching demand under tdd mode simultaneously.
5. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described carrier power amplifier and peak value power amplifier are used the realization in parallel of the LDMOS power tube of two discrete same models, or use a LDMOS power tube, it the is inner integrated power amplifier unit of two same units; Described carrier power amplifier is operated in the biasing of AB class, and its peak work is put and is operated in the biasing of C class, and it adopts symmetrical Doherty structure, efficiency when raising final stage power amplifier device is exported from saturation power point rollback 7dB; It strengthens electric capacity and the resistance of network f by suitable selecting video bandwidth enhancement network e, video bandwidth, suitable selecting video bandwidth enhancement network g, video bandwidth strengthen the electric capacity in network h, the video bandwidth that strengthens final stage power amplifier device meets the switching demand under tdd mode simultaneously.
6. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described grid voltage biasing circuit a, grid voltage biasing circuit b, grid voltage biasing circuit c, grid voltage biasing circuit d are comprised of some resistance connection in series-parallel, wherein, grid voltage biasing circuit a, grid voltage biasing circuit b offer supply power voltage and promote the required grid operating voltage of level amplifirer after dividing potential drop; Grid voltage biasing circuit c, grid voltage biasing circuit d offer the required grid operating voltage of final stage power amplifier device by supply power voltage through dividing potential drop; Described leakage is pressed biasing circuit a, is leaked and press biasing circuit b, leakage to press biasing circuit c, leak and press biasing circuit d to be comprised of magnetic bead, the connection in series-parallel of electrochemical capacitor related device; Wherein, described leakage is pressed biasing circuit a, is leaked and press biasing circuit b to offer the required drain electrode operating voltage stable, that ripple is little of promotion level amplifirer; Described leakage is pressed biasing circuit c, is leaked and press biasing circuit d to offer the required drain electrode operating voltage stable, that ripple is little of final stage power amplifier device.
7. video bandwidth according to claim 1 strengthens amplifirer, it is characterized in that: described video bandwidth strengthens network a, video bandwidth strengthens network b, video bandwidth enhancing network e, video bandwidth enhancing network f, its Capacitance parallel connection by least two different magnitude capacitances resistance of connecting again forms, the electric capacity magnitude of its large capacitance is sodium method (nF) magnitude, and resistance scope is between 10-100 Europe; Described video bandwidth strengthens network c, and video bandwidth strengthens network d, and video bandwidth strengthens network g, and video bandwidth strengthens network h, and its Capacitance parallel connection by least two different magnitude capacitances forms, and the electric capacity magnitude of its maximum capacitance is microfarad magnitude.
8. adopt video bandwidth as claimed in claim 1 to strengthen a method of widening the doherty power amplifier video bandwidth under tdd mode for amplifirer, it is characterized in that: the method comprises:
1) adopt video bandwidth to strengthen amplifirer, it comprises promotion level amplifirer and final stage power amplifier device, and wherein, promoting level amplifirer is balanced type power amplifier structure, and described final stage power amplifier device is doherty power amplifier structure;
2) the described promotion power amplifier that promotes level amplifirer is all operated in category-B biasing, by electric capacity and resistance in suitable selecting video bandwidth enhancement network, is used for strengthening the described video bandwidth that promotes level amplifirer, meets the switching demand under tdd mode simultaneously;
3) carrier power amplifier in described final stage power amplifier device is operated in the biasing of AB class, its peak work is put and is operated in the biasing of C class, by electric capacity and resistance in suitable selecting video bandwidth enhancement network, be used for strengthening the video bandwidth of described final stage power amplifier device, meet the switching demand under tdd mode simultaneously.
9. the method for widening the doherty power amplifier video bandwidth under tdd mode according to claim 8, it is characterized in that: described video bandwidth strengthens network and mainly by video bandwidth enhancing network a, video bandwidth enhancing network b, video bandwidth enhancing network c, video bandwidth enhancing network d, video bandwidth, strengthens network e video bandwidth enhancing network f, video bandwidth enhancing network g, video bandwidth enhancing network h composition; Described video bandwidth strengthens network a, video bandwidth and strengthens that network b, video bandwidth strengthen network e, video bandwidth strengthens network f, and its Capacitance parallel connection by least two different magnitude capacitances resistance of connecting again forms; Described video bandwidth strengthens network a, video bandwidth strengthens network b, video bandwidth enhancing network e, video bandwidth enhancing network f, and the electric capacity magnitude of its large capacitance is sodium method (nF) magnitude, and resistance scope is between 10-100 Europe; Described video bandwidth strengthens network c, video bandwidth strengthens network d, video bandwidth enhancing network g, video bandwidth enhancing network h, and its Capacitance parallel connection by least two different magnitude capacitances forms, and the electric capacity magnitude of maximum capacitance is microfarad magnitude.
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| CN110098809A (en) * | 2019-05-13 | 2019-08-06 | 大唐终端技术有限公司 | A kind of gallium nitride power amplifier timing protection power supply unit |
| CN110098809B (en) * | 2019-05-13 | 2023-04-18 | 大唐终端技术有限公司 | Power supply device for gallium nitride power amplifier time sequence protection |
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