CN202471912U - Device for detecting fault of amplifier circuit and power amplifier circuit - Google Patents
Device for detecting fault of amplifier circuit and power amplifier circuit Download PDFInfo
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- CN202471912U CN202471912U CN2012201123081U CN201220112308U CN202471912U CN 202471912 U CN202471912 U CN 202471912U CN 2012201123081 U CN2012201123081 U CN 2012201123081U CN 201220112308 U CN201220112308 U CN 201220112308U CN 202471912 U CN202471912 U CN 202471912U
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Abstract
The utility model discloses a device for detecting a fault of an amplifier circuit and a power amplifier circuit, the device comprises a load, a current detector and a comparison device, wherein the load is connected with the power amplifier consisted in the amplifier circuit; the current detector is used for detecting current which passes through the power amplifier and the load, and is used for defining a detected voltage value according to the obtained current value and the load; the comparison device is used for comparing the detected voltage value defined by the current detector with a preset voltage value, and is used for defining whether an alarm of the fault on the amplifier circuit is sent according to a compared result; and the preset voltage value is defined according to the load and a maximum current value born by the power amplifier. By the adoption of the technical schemes, the power amplifier with the fault can be effectively detected, and the alarm is sent according to the detected result, thus the accuracy on monitoring the amplifier circuit fault is improved, and the stability of an overall amplifier circuit operation is further increased.
Description
Technical field
The utility model relates to the power amplifier technical field, especially relates to a kind of device and a kind of many conspicuous band Doherty power amplifier circuits of detecting amplifier fault.
Background technology
Along with the development of mobile communication technology, the covering scale of mobile communications network is also increasing, the power amplifier in repeater and the base station (PA, Power Amplifier) has been proposed the requirement of " multicarrier, high linearity, high-level efficiency, low-carbon environment-friendly ".Therefore having high efficiency many conspicuous band (Doherty) technology is widely used; As shown in Figure 1; Be the basic block diagram of Doherty amplifier circuit principle, the Doherty amplifier circuit mainly is made up of power splitter 101 and two branch circuits, wherein; Carrier power amplifier (Carrier Amplified) 102 connects an output terminal of power splitter 101; Output terminal at carrier power amplifier 102 is in series with first microstrip line 103 with impedance conversion effect, thereby constitutes first branch circuit, also can be referred to as carrier wave (Carrier) road.Wherein another output terminal of power splitter 101 is connected with second microstrip line 104 with phase equilibrium effect; Second microstrip line 104 is connected with at least one peak power amplifier (Peak Amplified) 105; Thereby constitute second branch circuit, be referred to as peak value (Peak) road again.First branch circuit and parallel the 3rd microstrip line 106 of connecting and having the load draw afterwards that is connected of second branch circuit.Wherein, the value of first microstrip line 103, second microstrip line 104 and the 3rd microstrip line 106 can be λ/4, and the value of λ can be confirmed according to the center frequency point information of amplifier circuit working frequency range.
Hardware based on Doherty amplifier circuit shown in Figure 1 is formed structure; The principle of work of Doherty amplifier circuit is: after the signal input; When the carrier power amplifier on Carrier road 102 when saturated, the peak power amplifier 105 on Peak road is started working output current.When peak power amplifier 105 work on Peak road; Can the impedance on Carrier road be reduced; Make the carrier power amplifier 102 on Carrier road reach power and can export bigger electric current when saturated; When guaranteeing simultaneously to work on the Peak road, the active load 107 impedance step-downs that the 3rd microstrip line 106 of peak power amplifier 105 back connects.Be in normal operating conditions following time at whole Doherty circuit, the carrier power amplifier 102 on Carrier road is operated in the AB class, and the peak power amplifier 105 on Peak road is operated in the C class.Because the carrier power amplifier 102 on Peak road peak power amplifier 105 and Carrier road all is to adopt the LDMOS pipe; But duty is different; In order to monitor the duty of entire circuit reliably, the malfunction monitoring of LDMOS pipe becomes the emphasis of paying close attention in the present industry.Prior art generally adopts gain warning circuit or grid voltage warning circuit to monitor the malfunction of Doherty amplifier circuit.But; Because the singularity of Doherty amplifier circuit; The characteristic that characterized out after the LDMOS pipe on Peak road and Carrier road lost efficacy respectively is different: if adopt the gain warning circuit to monitor the malfunction of Doherty amplifier circuit; After the LDMOS pipe (being peak power amplifier 105) on Peak road breaks down (being the LDMOS tube failure), whole Doherty amplifier circuit gain (Gain) changes also very little, and in the Doherty of different designs mode amplifier circuit; Gain changes also inequality; So adopt the Gain warning circuit to realize monitoring the fault of Doherty amplifier circuit, occur the mistake alarm easily, and then reduced the stability of whole Doherty amplifier circuit; And adopt the grid voltage warning circuit to monitor the malfunction of Doherty amplifier circuit; Because the grid voltage of the LDMOS on Peak road pipe (being peak power amplifier 105) is smaller; The grid voltage warning circuit can't monitor the correspondent voltage value, so also can't adopt the grid voltage warning circuit to come accurately to realize the fault of monitoring Doherty amplifier.
The utility model content
The utility model embodiment provides a kind of circuit of detecting amplifier fault, with the accuracy of raising Doherty amplifier circuit failure monitoring, and then improves the stability of whole Doherty amplifier circuit work.
Correspondingly, the utility model also provides a kind of many conspicuous band Doherty power amplifier circuits.
The technical scheme that the utility model embodiment provides is following:
A kind of device of detecting amplifier fault comprises: be connected the load on the power amplifier that comprises in the amplifier circuit; The electric current of flow through said power amplifier and said load is detected and the size of the current value that obtains according to detection and said load confirms to detect the current detector of magnitude of voltage; Detection magnitude of voltage and predeterminated voltage value that said current detector is confirmed compare, and determine whether to send the comparison means of the warning that said amplifier circuit breaks down according to comparative result; Wherein, the said predeterminated voltage value lowest high-current value that can bear according to said power amplifier and the size of said load are confirmed.
A kind of many conspicuous band Doherty power amplifier circuits; Comprise the power splitter that connects signal input part; Carrier path and peak value road that different with power splitter respectively output terminals connect; Wherein said carrier path comprises successively the carrier power amplifier and first microstrip line that connects, and said peak value road comprises second microstrip line and the peak power amplifier that connects successively, with the 3rd microstrip line that is connected with the peak power amplifier with first microstrip line respectively; Said the 3rd microstrip line connects signal output part, and the signal output part of said carrier power amplifier and/or peak power amplifier is connected with the device of the detecting amplifier fault of above-mentioned proposition.
Adopt technique scheme, in amplifier circuit, can effectively detect the power amplifier that breaks down; Especially in the Doherty amplifier circuit, when carrier power amplifier and/or peak power amplifier break down, can effectively detect the power amplifier that breaks down; And according to detected result; Send warning, thereby improve the accuracy of Doherty amplifier circuit failure monitoring, and then improve the stability of whole Doherty amplifier circuit work.
Description of drawings
Fig. 1 is among the utility model embodiment one, the principle assumption diagram of the Doherty amplifier circuit of proposition;
Fig. 2 is among the utility model embodiment one, the apparatus structure composition diagram of the detecting amplifier fault of proposition;
Fig. 3 a is among the utility model embodiment two, and the power amplifier in the Doherty power amplifier circuit of proposition is at the working state schematic representation of middle power input;
Fig. 3 b is among the utility model embodiment two, and the power amplifier in the Doherty power amplifier circuit of proposition is at the working state schematic representation of high power input
Fig. 4 is among the utility model embodiment two, efficiency curve synoptic diagram under the Doherty power amplifier circuit perfect condition of proposition;
Fig. 5 is among the utility model embodiment two, the apparatus structure composition diagram of the detecting amplifier fault of proposition;
Fig. 6 is among the utility model embodiment three, the apparatus structure composition diagram of the detecting amplifier fault of proposition.
Embodiment
The accuracy that exists to the method for detection power amplifier fault in the prior art is lower; The mistake alarm often takes place; And in the Doherty amplifier circuit, during owing to carrier power amplifier and peak power amplifier operate as normal, residing state is different; So can't accurately monitor the power amplifier that breaks down; And then influencing the problem of the stability of whole Doherty amplifier circuit work, the utility model proposes a kind of device of detecting amplifier fault here, comprises the load that is connected on the power amplifier that comprises in the amplifier circuit; And the current detector that the electric current of flow through this monitored power amplifier and load is detected and confirm to detect according to testing result magnitude of voltage; And compare according to detection magnitude of voltage and the predeterminated voltage value that current detector is confirmed, and determine whether to send the comparison means of the warning that this amplifier circuit breaks down according to comparative result, can effectively detect the power amplifier that breaks down; And this amplifier circuit failure detector is applied in the Doherty amplifier circuit; Can determine the amplifier that breaks down preferably, improve the accuracy of Doherty amplifier circuit failure monitoring, and then improve the stability of whole Doherty amplifier circuit work.
To combine each accompanying drawing at length to set forth below to the main realization principle of the utility model embodiment technical scheme, embodiment and to the beneficial effect that should be able to reach.
Need to prove that each electronic devices and components all has load voltage value corresponding with it or load current value when dispatching from the factory, promptly stipulated each electronic devices and components when working long hours, the optimum voltage value or the optimum amounts of current that are suitable for.When this electronic devices and components operate as normal; The load voltage value or the load current value of the magnitude of voltage of these components and parts or current value overshoot if flow through; Easily these electronic devices and components are burnt out; If be lower than the load voltage value or the load current value of regulation, these electronic devices and components maybe not can operate as normal.But in the process of design of electronic circuits, the current value of each electronic devices and components of flowing through is incomplete same, in order to accurately measure certain components and parts in electronic circuit; Pairing magnitude of voltage during operate as normal; Avoid simultaneously other components and parts are caused interference, in the process of design of electronic circuits, a load can be set; This load can be connected with measured electronic devices and components; The flow through current value of load of this setting of detection multiplies each other the magnitude of voltage in the time of accessing this electronic devices and components operate as normal with the size of the current value that obtains and this load.Wherein, the size of the load of setting is according to the load voltage value of this measured components and parts and in electronic circuit, and when operate as normal, the flow through current value size of these components and parts of these measured components and parts is come definite.
Embodiment one
The device of a kind of detecting amplifier fault that the utility model embodiment one proposes here, its concrete structure is formed as shown in Figure 2, comprising:
The amplifier circuit that comprises at least one power amplifier; Be connected the load 202 on the power amplifier 201 that comprises in the amplifier circuit; The electric current of flow through power amplifier 201 and load 202 is detected and the current value that obtains according to detection and the size of load 202 confirm to detect the current detector 203 of magnitude of voltage, and the load 202 and the current detector 203 that are connected on the power amplifier 201 constitute current detection circuit together.And detection magnitude of voltage and the predeterminated voltage value that current detector 203 is determined compared, and determine whether to send the comparison means 204 of the warning that amplifier circuit to be detected breaks down according to comparative result.Wherein, the lowest high-current value that the predeterminated voltage value can be born according to power amplifier 201 and the size of load 202 are confirmed, also can confirm according to the load voltage value of power amplifier to be detected 201.
Wherein, be connected on the power amplifier to be detected 201 load 202 can but to be not limited to be resistance, preferably, the utility model embodiment adopts precision resistance as load here, is connected on the power amplifier to be detected 201.
Particularly, current detector 203 is connected the two ends of load 202, and promptly current detector 203 is connected in parallel in the current detection circuit with load 202.Comparison means 204 can but to be not limited to be the comparer 2041 that is connected current detector 203 output terminals.
Wherein, the current detection circuit that the utility model embodiment one proposes here can be to the real-time monitoring of the running status of the power amplifier in the power amplifier circuit 201, and the running status to power amplifier 201 that also can discontinuity is monitored.A kind of preferable implementation; In order to reduce the electromagnetic interference (EMI) between electronic devices and components; Also can increase simultaneously the serviceable life of current detection circuit; The device of the utility model embodiment one above-mentioned proposition also comprises the magnitude of voltage of power amplifier 201 is monitored, and according to the MCU chip 2042 of the On/Off state of monitoring result Control current detecting device 203.
More particularly, the device of the detecting amplifier fault that the utility model embodiment one proposes here, comparison means 204 can also be the MCU chips 2042 that is connected the current detector output terminal.
Embodiment two
Doherty power amplifier circuit in the prior art (can referring to Fig. 1); When being in normal operating conditions; Power amplifier in the Doherty power amplifier circuit is operated in three kinds of different working states respectively, be respectively low power state, middle power rating (a) and high-power state (like Fig. 3 b) like Fig. 3.Under the low power state, do not work in the peak value road in the Doherty power amplifier circuit, and output terminal impedance (referring to the 3rd microstrip line shown in Figure 1) is in open-circuit condition, at this moment, has only carrier path work in the Doherty power amplifier circuit.Wherein, the carrier power amplifier that comprises in the Doherty power amplifier circuit can but to be not limited to be LDMOS pipe, its duty is the AB class.During power rating, start working in the peak value road, along with the continuous increase of power input; At high-power state; The peak value road reaches the saturated output point of peak value, and at this moment, peak value road and carrier path are all exported with the impedance of optimum matching; And carrier power amplifier and peak power amplifier in the Doherty power amplifier circuit reach high-level efficiency and high power state.Efficiency curve diagram when Doherty power amplifier circuit as shown in Figure 4 is in the ideal operation state.Wherein, what the peak power amplifier that the peak value road comprises adopted also can be the LDMOS pipe, and its duty is the C class.
From the above; When the Doherty power amplifier circuit is operated in low power state and middle power rating; The drain electrode DC current of the peak power amplifier in the peak value road is almost 0 (when middle power rating; The peak power amplifier on peak value road is just opened work), when PV did not arrive, the peak power amplifier on peak value road was idle.Based on this, the utility model embodiment two on the basis of the foregoing description one, proposes a kind of Doherty power amplifier circuit here, and is as shown in Figure 5, comprising:
The power splitter 101 that connects signal input part; Carrier path and peak value road that different with power splitter 101 respectively output terminals connect; Wherein carrier path comprises the carrier power amplifier 102 and first microstrip line 103 that connects successively; The peak value road comprises second microstrip line 104 and peak power amplifier 105 that connects successively; Connect signal output parts with the 3rd microstrip line 106, the three microstrip lines 106 that first microstrip line 103 is connected with peak power amplifier 105 respectively, connect the device of the detecting amplifier fault that proposes in the above-mentioned enforcement one at the signal output part of carrier power amplifier 102 and/or peak power amplifier 105.
Wherein, the value of first microstrip line 103, second microstrip line 104 and the 3rd microstrip line 106 can but to be not limited to be λ/4, wherein, λ can but be not limited to confirm according to the center frequency point value of the working frequency range of Doherty power amplifier circuit.Carrier power amplifier 102 all can adopt the LDMOS pipe with peak power amplifier 105.
Need to prove; The Doherty power amplifier circuit that the utility model embodiment two proposes here; The device that can only connect the detecting amplifier fault of the utility model embodiment one above-mentioned proposition at the signal output part of carrier power amplifier 102 also can only connect the device of the detecting amplifier fault of the utility model embodiment one above-mentioned proposition at the signal output part of peak power amplifier 105.
In order to guarantee to monitor accurately the malfunction of all power amplifiers in the Doherty power amplifier circuit; A kind of preferable implementation; The utility model embodiment two is connected with the device of the detecting amplifier fault of the utility model embodiment one above-mentioned proposition here at the signal output part of each power amplifier.
Wherein, at the signal output part of carrier power amplifier 102, connect first resistance 311, first current detector, 305, the first current detectors 305 that are connected with the first resistance two ends and first resistance 311 constitute first current detection circuit 301.First comparison means 303 that is connected with first current detector 305.Particularly, the setting of the resistance of first resistance 311 can but be not limited to adopt following dual mode:
First kind of mode: according to the load voltage value of carrier power amplifier to be detected and when the carrier power amplifier is in normal operating conditions (the LDMOS pipe is in the AB time-like), the current value of this amplifier of flowing through is confirmed.
The second way: by circuit designer rule of thumb, select the first suitable resistance.
Wherein,, be used for the electric current of flow through the carrier power amplifier 102 and first resistance 311 is detected with first current detector 305 that first resistance, 311 two ends are connected, and the current value that obtains according to detection and the resistance of first resistance 311, confirm to detect magnitude of voltage.
The above-mentioned detailed concrete principle of work of having set forth the Doherty power amplifier circuit carrier path that the utility model embodiment two proposes here; Further; For the peak value road in the Doherty power amplifier circuit,, connect second resistance 308 at the signal output part of peak power amplifier 105; Second current detector 309 that is connected with second resistance, 308 two ends is with second comparison means 304 that is connected with second current detector 309.Wherein, second resistance 308 and second current detector 309 connect and compose second current detection circuit 302 side by side.Particularly, the setting of the resistance of second resistance 308 can but be not limited to adopt following dual mode:
First kind of mode: according to the load voltage value of peak power amplifier 105 to be detected and when peak power amplifier 105 is in normal operating conditions (the LDMOS pipe is in the C time-like), the current value of this amplifier of flowing through is confirmed.
The second way: by circuit designer rule of thumb, select the second suitable resistance 308.
Wherein, In the peak value road of Doherty power amplifier circuit; Second current detector 309 that is connected with second resistance, 308 two ends; Be used for the electric current of flow through the peak power amplifier 105 and second resistance 308 is detected, and the current value that obtains according to detection and the resistance of second resistance 308, confirm to detect magnitude of voltage.Particularly, second resistance 308 and second current detector 309 constitute second current detection circuit 302.
Particularly, second comparator device 304 can be second comparer 310 that is connected second current detector, 309 signal output parts.Second comparer 310 obtains the detection magnitude of voltage that second current detector 309 is confirmed; The detection magnitude of voltage that will obtain then compares with the second preset voltage threshold, and determines whether to send the warning message that this peak power amplifier breaks down according to comparative result.Particularly; Preset second voltage threshold can but to be not limited to be that the lowest high-current value that can bear according to peak power amplifier 105 is definite with the resistance of second resistance 308, the load voltage value of (the LDMOS plumber is the C class as state) is confirmed when perhaps being in normal operating conditions according to peak power amplifier 105.During greater than preset second voltage threshold, confirm that peak power amplifier 105 breaks down at the detection magnitude of voltage that obtains, send out fault alarm information this moment.During less than preset second voltage threshold, confirm that monitored peak power amplifier 105 is in normal operating conditions at the detection magnitude of voltage that obtains.
A kind of preferably implementation; In the Doherty power amplifier circuit that the utility model embodiment two proposes here; Also comprise the MCU chip 307 that is connected 101 two output terminals of power splitter; MCU chip 307 is used for the voltage of power splitter 101 output terminals is detected, and according to the magnitude of voltage that detection obtains, is controlled in the Doherty power amplifier circuit; Be separately positioned on carrier path and peak value road, the device that is used for detected carrier power amplifier 102 and peak power amplifier 105 faults is opened or closing state.
Embodiment three
The utility model embodiment three on the basis of the foregoing description one and embodiment two, further, has proposed a kind of Doherty power amplifier circuit here, and is as shown in Figure 6, comprising:
The power splitter 101 that connects signal input part; Carrier path and peak value road that different with power splitter 101 respectively output terminals connect; Wherein carrier path comprises the carrier power amplifier 102 and first microstrip line 103 that connects successively; The peak value road comprises second microstrip line 104 and peak power amplifier 105 that connects successively; Connect signal output parts with the 3rd microstrip line 106, the three microstrip lines 106 that first microstrip line 103 is connected with peak power amplifier 105 respectively, connect the device of the detecting amplifier fault that proposes in the above-mentioned enforcement one at the signal output part of carrier power amplifier 102 and/or peak power amplifier 105.
Wherein, the value of first microstrip line 103, second microstrip line 104 and the 3rd microstrip line 106 can but to be not limited to be λ/4, wherein, λ confirms according to the center frequency point value of the working frequency range of Doherty power amplifier circuit.Preferably, the utility model embodiment three here, carrier power amplifier 102 all adopts the LDMOS pipe with peak power amplifier 105.
Need to prove; The Doherty power amplifier circuit that the utility model embodiment three proposes here; The device that can only connect the detecting amplifier fault of the utility model embodiment one above-mentioned proposition at the signal output part of carrier power amplifier 102 also can only connect the device of the detecting amplifier fault of the utility model embodiment one above-mentioned proposition at the signal output part of peak power amplifier 105.
In order to guarantee to monitor accurately the malfunction of all power amplifiers in the Doherty power amplifier circuit; A kind of preferable implementation; The utility model embodiment three is connected with the device of the detecting amplifier fault of the utility model embodiment one above-mentioned proposition here at the signal output part of each power amplifier.
Wherein, at the signal output part of carrier power amplifier 102, connect first resistance 303, first current detector 304 that is connected with first resistance, 303 two ends is with the comparison means 401 that is connected with first current detector 304.Wherein, first resistance 303 and first current detector 304 connect and compose first current detection circuit 302 side by side.Particularly, the establishing method of the resistance of first resistance 303 sees also the detailed elaboration in the foregoing description two, repeats no more here.Particularly; First current detector 304 that is connected with first resistance, 303 two ends; Be used for the electric current of flow through the carrier power amplifier 102 and first resistance 303 is detected, and the current value that obtains according to detection and the resistance of first resistance 303, confirm to detect magnitude of voltage.The comparison means 401 that is connected with first current detector, 304 signal output parts according to the detection magnitude of voltage and preset voltage threshold that first current detector is determined, is made judgement to the malfunction of monitored carrier power amplifier.
Further; Peak value road for the Doherty power amplifier circuit; Signal output part at peak power amplifier 105; Connect second resistance 305, second current detector 306 that is connected with second resistance, 305 two ends is with the comparison means 401 that is connected with second current detector, 306 signal output parts.Wherein, second resistance 305 and second current detector 306 connect and compose second current detection circuit 301 side by side.Particularly, the establishing method of the resistance of second resistance 308 sees also in the foregoing description two and sets forth in detail, repeats no more here.
Wherein, In the peak value road of Doherty power amplifier circuit; Second current detector 306 that is connected with second resistance, 305 two ends; Be used for the electric current of flow through the peak power amplifier 105 and second resistance 305 is detected, and the current value that obtains according to detection and the resistance of second resistance 305, confirm to detect magnitude of voltage.The comparison means 401 that is connected with second current detector, 306 signal output parts according to the detection magnitude of voltage and preset voltage threshold that second current detector 306 is determined, is made judgement to the malfunction of monitored peak power amplifier.
In the Doherty power amplifier circuit that the utility model embodiment three proposes here, comparison means 401 can adopt the MCU chip, and the MCU chip is connected with the signal output part of first current detector 304 and second current detector 306 respectively.Be used to obtain the detection magnitude of voltage that first current detector 304 and second current detector 306 are confirmed; The detection magnitude of voltage that will obtain then compares with preset voltage threshold, and determines whether to send the warning message that this peak power amplifier breaks down according to comparative result.
In the Doherty power amplifier circuit; When the peak power amplifier on peak value road breaks down (for example drain break down and shorted to earth or gate breakdown); The drain current of peak power amplifier can occur excessive or not have the phenomenon of electric current, makes the gain of whole Doherty power amplifier circuit reduce by 1～3dB.Based on this, MCU can be respectively carrier path and peak value road two different voltages with different threshold values are set when voltage threshold is set, preferably, and for the voltage threshold that the peak value road is provided with can be greater than the voltage threshold that is provided with for carrier path.
A kind of preferably implementation; In the Doherty power amplifier circuit that the utility model embodiment two proposes here, MCU also is connected with 101 two output terminals of power splitter, and the MCU chip also is used for the voltage of power splitter 101 output terminals is detected; The magnitude of voltage that obtains according to detection; Be controlled in the Doherty power amplifier circuit, be separately positioned in carrier path and the peak value road, the device that is used for detected carrier power amplifier and peak power amplifier fault is opened or closing state.
More particularly; When the Doherty power amplifier circuit is in normal operating conditions; Because the carrier power amplifier of carrier path is operated in the AB class always; Can directly adopt the power amplifier circuit failure detector that it is detected, and compare according to testing result and preset voltage threshold.The threshold value of On/Off state need be set for the power amplifier circuit failure detector that is connected with the carrier power amplifier through the MCU chip.And for the peak value road; Because the peak power amplifier in the peak value road; During the power duty, the peak power amplifier is just opened work in the Doherty power amplifier circuit is in, because; For the accuracy that guarantees to monitor, the threshold value of On/Off state can be set through the power amplifier circuit failure detector that MCU connects for the peak power amplifier.And the threshold value that the power amplifier circuit failure detector that connects for the peak power amplifier is provided with the On/Off state is less than the voltage threshold of the fault alarm that is provided with into the peak power amplifier.Like this; When the Doherty power amplifier circuit is in middle power or low-power operation state; Erroneous judgement can not appear in the malfunction to the peak power amplifier in the Doherty power amplifier circuit, thereby guarantees the stability of Doherty power amplifier circuit work.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (9)
1. the device of a detecting amplifier fault is characterized in that, comprising:
Be connected the load on the power amplifier that comprises in the amplifier circuit;
The electric current of flow through said power amplifier and said load is detected and the size of the current value that obtains according to detection and said load confirms to detect the current detector of magnitude of voltage;
Detection magnitude of voltage and predeterminated voltage value that said current detector is confirmed compare, and determine whether to send the comparison means of the warning that said amplifier circuit breaks down according to comparative result;
Wherein, the said predeterminated voltage value lowest high-current value that can bear according to said power amplifier and the size of said load are confirmed.
2. device as claimed in claim 1 is characterized in that said current detector is connected the two ends of said load.
3. device as claimed in claim 1 is characterized in that, said comparison means is the comparer that is connected the current detector output terminal.
4. device as claimed in claim 3 is characterized in that, also comprises:
Magnitude of voltage to said power amplifier is monitored, and controls the microcontroller MCU chip of the On/Off state of said current detector according to monitoring result.
5. device as claimed in claim 1 is characterized in that, said comparison means is the microcontroller MCU chip that is connected the current detector output terminal.
6. device as claimed in claim 5 is characterized in that, said MCU chip is also monitored the magnitude of voltage of said power amplifier, and controls the On/Off state of said current detector according to monitoring result.
7. be with the Doherty power amplifier circuit for more than one kind hertz; It is characterized in that, comprise signal input part and signal output part, connect the power splitter of signal input part; Carrier path and peak value road that different with power splitter respectively output terminals connect; Wherein said carrier path comprises successively the carrier power amplifier and first microstrip line that connects, and said peak value road comprises second microstrip line and the peak power amplifier that connects successively, with the 3rd microstrip line that is connected with the peak power amplifier with first microstrip line respectively; Said the 3rd microstrip line connects said signal output part, it is characterized in that:
The signal output part of said carrier power amplifier and/or peak power amplifier is connected with the device of the described detecting amplifier fault of 1～6 arbitrary claim.
8. circuit as claimed in claim 7 is characterized in that, the value of said first microstrip line, second microstrip line and the 3rd microstrip line is λ/4, and wherein, λ confirms according to the center frequency point value of the working frequency range of Doherty power amplifier circuit.
9. like the arbitrary described circuit of claim 7～8, it is characterized in that said carrier power amplifier and peak power amplifier are the LDMOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201123081U CN202471912U (en) | 2012-03-22 | 2012-03-22 | Device for detecting fault of amplifier circuit and power amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201123081U CN202471912U (en) | 2012-03-22 | 2012-03-22 | Device for detecting fault of amplifier circuit and power amplifier circuit |
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| Publication Number | Publication Date |
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| CN202471912U true CN202471912U (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201123081U Expired - Lifetime CN202471912U (en) | 2012-03-22 | 2012-03-22 | Device for detecting fault of amplifier circuit and power amplifier circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014161354A1 (en) * | 2013-07-22 | 2014-10-09 | 中兴通讯股份有限公司 | Control method and device for doherty power amplifier |
| CN108352816A (en) * | 2015-10-27 | 2018-07-31 | 瑞典爱立信有限公司 | Distributed power amplifier |
| CN109407749A (en) * | 2018-09-21 | 2019-03-01 | 武汉精立电子技术有限公司 | A kind of expansion flow module of power amplifier |
| CN110832329A (en) * | 2017-07-05 | 2020-02-21 | 罗伯特·博世有限公司 | Device and method for checking the functional validity of a system resistor of a battery system |
-
2012
- 2012-03-22 CN CN2012201123081U patent/CN202471912U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014161354A1 (en) * | 2013-07-22 | 2014-10-09 | 中兴通讯股份有限公司 | Control method and device for doherty power amplifier |
| CN108352816A (en) * | 2015-10-27 | 2018-07-31 | 瑞典爱立信有限公司 | Distributed power amplifier |
| CN108352816B (en) * | 2015-10-27 | 2021-07-06 | 瑞典爱立信有限公司 | Distributed power amplifier |
| CN110832329A (en) * | 2017-07-05 | 2020-02-21 | 罗伯特·博世有限公司 | Device and method for checking the functional validity of a system resistor of a battery system |
| CN110832329B (en) * | 2017-07-05 | 2022-08-09 | 罗伯特·博世有限公司 | Device and method for checking the functional validity of a system resistor of a battery system |
| CN109407749A (en) * | 2018-09-21 | 2019-03-01 | 武汉精立电子技术有限公司 | A kind of expansion flow module of power amplifier |
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