US20110241783A1 - Detector circuit and system for a wireless communication - Google Patents
Detector circuit and system for a wireless communication Download PDFInfo
- Publication number
- US20110241783A1 US20110241783A1 US13/164,420 US201113164420A US2011241783A1 US 20110241783 A1 US20110241783 A1 US 20110241783A1 US 201113164420 A US201113164420 A US 201113164420A US 2011241783 A1 US2011241783 A1 US 2011241783A1
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- Prior art keywords
- circuit
- bias
- amplifier circuit
- stage amplifier
- driver stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Definitions
- the present invention relates to a detector circuit used in a wireless communication system, such as a mobile telephone. More particularly, the present invention relates to detection of an operating current in a radio frequency power amplifier for controlling an output power in a wireless communication system.
- the detector circuit has been often formed as a semiconductor integrated circuit independent of the radio frequency power amplifier. However, owing to a demand for reduction of the number of parts in recent years, the detector circuit tends to be integrated in the radio frequency power amplifier.
- FIG. 12 is a diagram illustrating a conventional detector circuit of power detection type disclosed in Japanese Translation of PCT International Publication No. 2003-531547.
- an input matching circuit 2 is connected to a base of an amplifying transistor 1 and an output matching circuit 3 is connected to a collector of the amplifying transistor 1 .
- An input terminal 4 (Vin) is connected to the input matching circuit 2 .
- the output matching circuit 3 is connected to an output terminal 5 (Vout).
- a bias circuit 6 for supplying a bias is connected to the base of the amplifying transistor 1 .
- a detecting transistor 7 is connected in parallel with the amplifying transistor 1 .
- a root mean square circuit 8 is connected to a collector of the detecting transistor 7 .
- the detecting transistor 7 and the root mean square circuit 8 form the detector circuit 10 .
- the size of the detecting transistor 7 is smaller than that of the amplifying transistor 1 .
- a radio frequency signal (RF signal) is inputted to the detecting transistor 7 and the amplifying transistor 1 at the same time.
- the conventional detector circuit 10 detects the inputting power to the amplifying transistor 1 .
- the load impedance seen by the radio frequency power amplifier changes due to factors such as the distance between the antenna and the user's body, a correct power level cannot be indicated, because the detector circuit 10 cannot follow the load variation.
- a coupled device such as a directional coupler
- a circuit scale is increased and it becomes hard for the detector circuit 10 to be incorporated in the radio frequency power amplifier.
- such coupled device causes a loss, which has a worse hand in size and performance.
- An object of the present invention is to provide a detector circuit which has a simple circuit configuration and to provide a wireless communication system using the detector circuit. This is capable of indicating an accurate power level according to a load fluctuation of a radio frequency power amplifier or a difference in peak-to-average power ratio of a modulation wave signal, and can be easily incorporated in the radio frequency power amplifier.
- the present invention is directed to a detector circuit used for a power amplifier circuit including an amplifying transistor, and a bias circuit supplying the amplifying transistor with a bias current.
- a first aspect of the present invention is directed to a detector circuit including a resistor, having one end connected to a connecting point at which a bias circuit and a base of an amplifying transistor are connected with each other, for detecting a part of a bias current supplied from the bias circuit, and a current-voltage conversion circuit, connected to the other end of the resistor, for converting a current flowing through the resistor into a voltage.
- a bipolar transistor or a field effect transistor may be employed as the current-voltage conversion circuit.
- a current partition transistor having a collector and a base respectively connected to a collector and a base of an emitter follower transistor of the bias circuit for supplying a base of the amplifying transistor with a bias current is included, and a resistor, having one end connected to an emitter of the current partition transistor, detects a part of the emitter current supplied from the current partition transistor.
- the detector circuit can be used for a wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system including a driver stage amplifier circuit for amplifying a radio frequency signal, a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit, a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current, and a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current.
- the detector circuit is connected to either or both of the driver stage bias circuit and the final stage bias circuit.
- a control circuit can be further included, for controlling the bias currents from the driver stage bias circuit and the final stage bias circuit in accordance with a value of a voltage outputted from the detector circuit. Further, in the case where a DC-DC converter for supplying each of an output terminal of the driver stage amplifier circuit and an output terminal of the final stage amplifier circuit with a voltage, is included, the control circuit can control a voltage outputted from the DC-DC converter.
- an advantageous effect can be achieved that an accurate power level can be indicated in accordance with a load fluctuation or a difference in a modulation wave mode, and that the detector circuit can be easily incorporated in the radio frequency power amplifier.
- a power detection range (dynamic range) can be wider by separately providing a transistor at which a current is detected and a transistor for supplying a bias.
- FIG. 1 is a diagram illustrating a schematic configuration of a detector circuit according to a first embodiment of the present invention
- FIG. 2 is a diagram illustrating in detail an example of a detector circuit according to the first embodiment of the present invention
- FIG. 3 is a diagram illustrating relationship between an output power level and a detection voltage in an amplifying transistor of the first embodiment of the present invention
- FIG. 4 is a diagram illustrating in detail another example of a detector circuit according to the first embodiment of the present invention.
- FIG. 5 is a diagram illustrating in detail another example of a detector circuit according to the first embodiment of the present invention.
- FIG. 6 is a diagram illustrating in detail an example of a detector circuit according to a second embodiment of the present invention.
- FIG. 7 is a diagram illustrating in detail an example of a detector circuit according to a third embodiment of the present invention.
- FIG. 8 is a diagram illustrating a schematic configuration of a wireless communication system using the detector circuit of the present invention.
- FIG. 9 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention.
- FIG. 10 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention.
- FIG. 11 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention.
- FIG. 12 is a diagram illustrating a schematic configuration of a conventional detector circuit.
- FIG. 1 is a diagram illustrating a schematic configuration of a detector circuit 10 according to a first embodiment of the present invention.
- one end of an input matching circuit 2 , and a bias circuit 6 for supplying an amplifying transistor 1 with a bias are connected to a base of the amplifying transistor 1 .
- One end of an output matching circuit 3 is connected to a collector of the amplifying transistor 1 .
- An input terminal 4 is connected to the other end of the input matching circuit 2 , and the other end of the output matching circuit 3 is connected to an output terminal 5 .
- the detector circuit 10 which is connected to the base of the amplifying transistor 1 , includes a detecting resistor 11 and a current-voltage conversion circuit 12 .
- One end of the detecting resistor 11 is connected to a connecting point at which the bias circuit 6 and the base of the amplifying transistor 1 are connected with each other, and the detecting resistor 11 detects a part of a bias current flowing from the bias circuit 6 .
- the current-voltage conversion circuit 12 which is connected to the other end of the detecting resistor 11 , transforms to a voltage a part of the bias current flowing through the detecting resistor 11 .
- the bias current which is supplied from the bias circuit 6 to the amplifying transistor 1 , is set so as to allow a desired collector current to flow through the amplifying transistor 1 .
- a radio frequency signal is inputted from the input terminal 4 , amplified by the amplifying transistor 1 , and then outputted from the output terminal 5 .
- a bias current supplied from the bias circuit 6 to the amplifying transistor 1 also fluctuates greatly.
- a part of the bias current flowing into the detecting resistor 11 of the detector circuit 10 also fluctuates greatly.
- the current is converted to a voltage by the current-voltage conversion circuit 12 .
- the voltage which appears at a detector output terminal 9 is processed in a smoothing circuit (not shown). As a result, a detection voltage uniquely corresponding to an input power level is defined.
- a voltage outputted from the current-voltage conversion circuit 12 fluctuates depending on the current flowing into the detector circuit 10 .
- the output voltage from the detector circuit 10 is connected to an A/D converter of an RF-IC or a baseband IC. Accordingly, the output voltage may be approximately 2.4 V at a maximum due to the limitation of the supply voltage to the ICs. Further, the smaller the bias current is set, the wider the dynamic range can be. For this reason, the detecting resistor 11 has a preferable value of about several k ⁇ , and the detecting resistor 11 is set from 1 k ⁇ to 10 k ⁇ . Accordingly, the detector circuit 10 is configured so as to have high impedance, and exert little influence on the amplifying transistor 1 .
- FIG. 2 is a diagram illustrating in detail an example of a detector circuit 10 according to the first embodiment of the present invention where a bipolar transistor is employed for the current-voltage conversion circuit 12 .
- a bipolar transistor is employed for the current-voltage conversion circuit 12 .
- an example of the bias circuit 6 is also illustrated in detail, which is disclosed in Japanese Patent No. 3847756.
- the bias circuit 6 includes bipolar transistors 13 - 15 , resistors 16 - 19 , and power source terminals 20 and 21 .
- An emitter of the bipolar transistor 13 is connected to a base of the amplifying transistor 1 via a resistor 22 .
- the resistor 22 is a resistor for circuit stability. An operation of the bias circuit 6 is disclosed in Japanese Patent No. 3847756 and a description thereof will be omitted.
- the detector circuit 10 shown in FIG. 2 employs a bipolar transistor 23 as the current-voltage conversion circuit 12 .
- An emitter of the bipolar transistor 23 is connected to a ground.
- a base of the bipolar transistor 23 is connected to the emitter of the bipolar transistor 13 in the bias circuit 6 via a detecting resistor 11 .
- a collector of the bipolar transistor 23 is connected to the power source terminal 21 of the bias circuit 6 via a resistor 24 , and also connected to the detector output terminal 9 .
- a smoothing circuit, composed of a resistor 25 and a capacitor 26 is connected with the detector output terminal 9 in order to detect only DC components in the detection voltage.
- FIG. 3 is a diagram illustrating relationship between an output power level of the amplifying transistor 1 and the detection voltage according to the first embodiment. This result is measured under the condition that the frequency of an RF signal inputted to the amplifying transistor 1 is 2 GHz and the source voltage is 3.5 V. From the drawing, positive correlationship between the output power level and the detection voltage can be seen.
- FIG. 4 shows an example of another bias circuit.
- the bias circuit 6 comprises series-connected bipolar transistor 27 and 28 , which is connected to the base of the bipolar transistor 13 .
- the bias circuit 6 shown in FIG. 4 is preferably employed.
- FIG. 5 illustrates an example of another detector circuit.
- a field effect transistor 29 is employed for the current-voltage conversion circuit 12 in the detector circuit 10 instead of the bipolar transistor 23 .
- the field effect transistor 29 may be employed when relationship between input power and the detection voltage is designed to represent a square-law curve.
- FIG. 6 is a diagram illustrating in detail an example of a detector circuit 10 according to a second embodiment of the present invention.
- the detector circuit 10 of the second embodiment is different from the detector circuit 10 of the first embodiment as shown in FIG. 2 in that a portion, at which a voltage is detected, of the bipolar transistor 23 , is replaced with the emitter instead of the collector. Operations of other components are basically the same as described for the first embodiment and a detailed description thereof will be omitted.
- the bipolar transistor 23 is an emitter follower.
- the bipolar transistor 23 has low power gain, high input impedance and low output impedance, it serves as an impedance-converter or buffer amplifier.
- the detector circuit 10 according to the second embodiment is preferably used when a detection voltage is designed to be suppressed or when an influence of impedance fluctuation of the bias circuit 6 on the detecting output terminal 9 is desired to be reduced.
- the field effect transistor 29 may be employed instead of the bipolar transistor 23 as the current-voltage conversion circuit 12 .
- FIG. 7 is a diagram illustrating in detail an example of a detector circuit 10 according to a third embodiment of the present invention.
- the detector circuit 10 of the third embodiment is different from the detector circuit 10 of the first embodiment as shown in FIG. 2 in that the detector circuit 10 of the third embodiment additionally has resistors 31 and 32 , and a current partition transistor 30 , and is connected to an emitter of the current partition transistor 30 .
- Operations of other components are basically the same as described for the first embodiment and a detailed description thereof will be omitted.
- a base of the current partition transistor 30 is connected to a base of the bipolar transistor 13 via the resistor 31 .
- a collector of the current partition transistor 30 is connected to a collector of the bipolar transistor 13 .
- the emitter of the current partition transistor 30 is grounded via the resistor 32 , and connected to a base of a bipolar transistor 23 via the detecting resistor 11 .
- a current detected by the detector circuit 10 is not same as the current of the bipolar transistor 13 which supplies the amplifying transistor 1 with a bias current.
- a transistor connected to the detecting resistor 11 of the detector circuit 10 is separated from a transistor for supplying a bias, an effect on the bias circuit 6 (e.g., loss and stability) exerted by the detector circuit 10 is reduced.
- the value of the detection current can be set independently of a bias current to the amplifying transistor 1 . Therefore, a power detection range can be wider.
- the resistor 31 is preferably set so as to range from a few tens of ohms to a few hundreds of ohms in order to prevent the effect of the voltage rising on the base of the bipolar transistor 13 caused by a radio frequency signal. However, in some cases, for example, where the base of the bipolar transistor 13 is grounded via a capacitor (not shown), the resistor 31 may be set at zero ohm.
- the resistor 32 is set at approximately 1 k ⁇ at a minimum, and set at approximately 10 k ⁇ at a maximum in order to reduce the collector current of the current partition transistor 30 .
- FIGS. 8 through 11 are diagrams each illustrating an exemplary configuration of a wireless communication system using the detector circuit 10 according to any one of the first through third embodiments of the present invention.
- a radio frequency power amplifier is realized by a two-stage amplifier including a driver stage amplification circuit 33 and a final stage amplification circuit 34 .
- the input matching circuit 2 is connected to an input of the driver stage amplification circuit 33 .
- the output matching circuit 3 is connected to an output of the final stage amplification circuit 34 .
- a driver stage bias circuit 6 a is connected to the driver stage amplification circuit 33
- a final stage bias circuit 6 b is connected to the final stage amplification circuit 34 , respectively.
- the detector circuit 10 is connected to the final stage bias circuit 6 b .
- a DC-DC converter 35 is connected to both the driver stage amplification circuit 33 and the final stage amplification circuit 34 , such that a voltage obtained by decreasing or increasing a voltage from a battery (not shown) is supplied to both the driver stage amplification circuit 33 and the final stage amplification circuit 34 .
- FIG. 9 is a diagram illustrating a configuration where a control circuit 36 is arranged in addition to the configuration of the radio frequency power amplifier shown in FIG. 8 for directly controlling output power by reading the detection voltage.
- An output voltage from the detector circuit 10 which is connected to the final stage bias circuit 6 b , is applied to the control circuit 36 .
- Outputs of the control circuit 36 are connected to control terminals of the driver stage bias circuit 6 a , the final stage bias circuit 6 b , and the DC-DC converter 35 , respectively. In the control circuit 36 , necessary calculation is performed depending on the purpose.
- control circuit 36 performs feedback processing such that when the detection voltage is higher, a supply voltage to each of the bias circuits 6 a and 6 b or an output voltage from the DC-DC converter 35 is decreased in order to keep the output power from the radio frequency power amplifier constant.
- a supply voltage to each of the bias circuits 6 a and 6 b or an output voltage from the DC-DC converter 35 is controlled to obtain a desired output power level, that is, the detection voltage.
- FIG. 9 an example where the detector circuit 10 is connected to the final stage bias circuit 6 b is shown.
- the detector circuit 10 may be connected to the driver stage bias circuit 6 a as shown in FIG. 10 .
- the latter configuration is only applicable to the case where the input power to the driver stage amplification circuit 33 is high (e.g., 10 dBm or above) or a voltage detected by an A/D converter in an RF-IC or a baseband IC is relatively-precise.
- detector circuits 10 a and 10 b may be connected to the driver stage bias circuit 6 a and the final stage bias circuit 6 b , respectively, as shown in FIG. 11 .
- This configuration is effective in the case where, for example, concurrent operations of the driver stage amplification circuit 33 and the final stage amplification circuit 34 are inhibited, by alternatively switching on and off the driver stage bias circuit 6 a and the final stage bias circuit 6 b.
Abstract
Provided are a detector circuit which has a simple circuit configuration, is capable of indicating an accurate power according to a load fluctuation of a radio frequency power amplifier or a difference in a modulation mode, and can be easily incorporated in the radio frequency power amplifier, and a wireless communication system using the detector circuit. The detector circuit 10 includes a detecting resistor 11 for detecting a part of a current flowing from a bias circuit 6, and a current-voltage conversion circuit 12 for converting a current obtained through the detecting resistor 11 into a voltage. A current supplied from the bias circuit 6 to the amplifying transistor 1 is detected, so that an output current from the amplifying transistor 1 fluctuates when a load on the radio frequency power amplifier fluctuates, and an input current and a current from the bias circuit fluctuate in proportion to the output current from the amplifying transistor 1, whereby an outputted detection voltage can follow a load fluctuation on the radio frequency power amplifier.
Description
- 1. Field of the Invention
- The present invention relates to a detector circuit used in a wireless communication system, such as a mobile telephone. More particularly, the present invention relates to detection of an operating current in a radio frequency power amplifier for controlling an output power in a wireless communication system.
- 2. Description of the Background Art
- As for mobile telephones, it is necessary to control an output power of a radio frequency power amplifier according to a signal from a baseband circuit, so that the output power from the radio frequency power amplifier is detected. In general, as disclosed in Japanese Laid-Open Patent Publication No. 2001-16116, the output power is monitored in the detector circuit via a coupled device, such as a coupler, converted to a voltage value and fed back to the control circuit and the like.
- The detector circuit has been often formed as a semiconductor integrated circuit independent of the radio frequency power amplifier. However, owing to a demand for reduction of the number of parts in recent years, the detector circuit tends to be integrated in the radio frequency power amplifier.
- The detector circuit is classified, into a circuit for power detection, a circuit for voltage detection and a circuit for current detection. A conventional detector circuit will be described with reference to the drawing.
FIG. 12 is a diagram illustrating a conventional detector circuit of power detection type disclosed in Japanese Translation of PCT International Publication No. 2003-531547. - As shown in
FIG. 12 , aninput matching circuit 2 is connected to a base of anamplifying transistor 1 and anoutput matching circuit 3 is connected to a collector of the amplifyingtransistor 1. An input terminal 4 (Vin) is connected to theinput matching circuit 2. Theoutput matching circuit 3 is connected to an output terminal 5 (Vout). Abias circuit 6 for supplying a bias is connected to the base of the amplifyingtransistor 1. A detectingtransistor 7 is connected in parallel with the amplifyingtransistor 1. A root mean square circuit 8 is connected to a collector of the detectingtransistor 7. The detectingtransistor 7 and the root mean square circuit 8 form thedetector circuit 10. The size of the detectingtransistor 7 is smaller than that of the amplifyingtransistor 1. - Next, an operation of the
conventional detector circuit 10 will be described. - A radio frequency signal (RF signal) is inputted to the detecting
transistor 7 and the amplifyingtransistor 1 at the same time. - If an output voltage from the detecting
transistor 7 is directly used to a detection signal, an accurate average power cannot be obtained since the output voltage temporally fluctuates. For this reason, a voltage proportional to the square of the output current from the detectingtransistor 7 is generated and then the generated voltage is averaged, by connecting the root mean square circuit 8 with an output of the detectingtransistor 7. Because the transistors used for the amplifyingtransistor 1 and the detectingtransistor 7 have the same structure, the detection voltage (VDET) obtained at thedetector output terminal 9 is proportional to the power level of the amplifyingtransistor 1, and the power level is proportional to the square mean value of the current of the amplifyingtransistor 1. Accordingly, the power level can be indicated more accurately. - However, the
conventional detector circuit 10 detects the inputting power to the amplifyingtransistor 1. When the load impedance seen by the radio frequency power amplifier changes due to factors such as the distance between the antenna and the user's body, a correct power level cannot be indicated, because thedetector circuit 10 cannot follow the load variation. - In addition to this recent digital wireless communication systems are operated under the various modulation signals like Release 99, HSDPA, HSDPA, and various peak-to-average power ratio signals are used. However, when the peak-to-average power ratio of the modulation signal changes, 1 dB gain compression output power (P1 dB) of the transistor changes. Because the radio frequency power amplifier has multiple-stage transistors, the fluctuation of P1 dB causes a difference in the distortion characteristics in the each stage. As a result, output characteristics fluctuate in accordance with the modulation signal. Accordingly, the correct power cannot be obtained by detecting the input power level of the radio frequency power amplifier.
- On the other hand, when an output power level of the amplifying
transistor 1 is detected, a coupled device, such as a directional coupler, is used. As a result, a circuit scale is increased and it becomes hard for thedetector circuit 10 to be incorporated in the radio frequency power amplifier. In addition, such coupled device causes a loss, which has a worse hand in size and performance. - An object of the present invention is to provide a detector circuit which has a simple circuit configuration and to provide a wireless communication system using the detector circuit. This is capable of indicating an accurate power level according to a load fluctuation of a radio frequency power amplifier or a difference in peak-to-average power ratio of a modulation wave signal, and can be easily incorporated in the radio frequency power amplifier.
- The present invention is directed to a detector circuit used for a power amplifier circuit including an amplifying transistor, and a bias circuit supplying the amplifying transistor with a bias current. In order to attain the above-described object, a first aspect of the present invention is directed to a detector circuit including a resistor, having one end connected to a connecting point at which a bias circuit and a base of an amplifying transistor are connected with each other, for detecting a part of a bias current supplied from the bias circuit, and a current-voltage conversion circuit, connected to the other end of the resistor, for converting a current flowing through the resistor into a voltage. A bipolar transistor or a field effect transistor may be employed as the current-voltage conversion circuit.
- In another aspect, a current partition transistor having a collector and a base respectively connected to a collector and a base of an emitter follower transistor of the bias circuit for supplying a base of the amplifying transistor with a bias current is included, and a resistor, having one end connected to an emitter of the current partition transistor, detects a part of the emitter current supplied from the current partition transistor.
- The detector circuit can be used for a wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system including a driver stage amplifier circuit for amplifying a radio frequency signal, a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit, a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current, and a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current. The detector circuit is connected to either or both of the driver stage bias circuit and the final stage bias circuit.
- Note that a control circuit can be further included, for controlling the bias currents from the driver stage bias circuit and the final stage bias circuit in accordance with a value of a voltage outputted from the detector circuit. Further, in the case where a DC-DC converter for supplying each of an output terminal of the driver stage amplifier circuit and an output terminal of the final stage amplifier circuit with a voltage, is included, the control circuit can control a voltage outputted from the DC-DC converter.
- According to the present invention, an advantageous effect can be achieved that an accurate power level can be indicated in accordance with a load fluctuation or a difference in a modulation wave mode, and that the detector circuit can be easily incorporated in the radio frequency power amplifier.
- Further, another advantageous effect can be achieved that a power detection range (dynamic range) can be wider by separately providing a transistor at which a current is detected and a transistor for supplying a bias.
- These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
-
FIG. 1 is a diagram illustrating a schematic configuration of a detector circuit according to a first embodiment of the present invention, -
FIG. 2 is a diagram illustrating in detail an example of a detector circuit according to the first embodiment of the present invention; -
FIG. 3 is a diagram illustrating relationship between an output power level and a detection voltage in an amplifying transistor of the first embodiment of the present invention; -
FIG. 4 is a diagram illustrating in detail another example of a detector circuit according to the first embodiment of the present invention; -
FIG. 5 is a diagram illustrating in detail another example of a detector circuit according to the first embodiment of the present invention; -
FIG. 6 is a diagram illustrating in detail an example of a detector circuit according to a second embodiment of the present invention; -
FIG. 7 is a diagram illustrating in detail an example of a detector circuit according to a third embodiment of the present invention; -
FIG. 8 is a diagram illustrating a schematic configuration of a wireless communication system using the detector circuit of the present invention; -
FIG. 9 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention; -
FIG. 10 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention; -
FIG. 11 is a diagram illustrating another schematic configuration of a wireless communication system using the detector circuit of the present invention; and -
FIG. 12 is a diagram illustrating a schematic configuration of a conventional detector circuit. - Embodiments of the present invention will be described with reference to the drawings. Note that, with respect to figures for describing the preferred embodiments of the present invention, the same components as those of the conventional detector circuit and components having the same functions as those in the conventional detector circuit are denoted by the same reference numerals as used for the conventional detector circuit and a repeated description thereof will be omitted.
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FIG. 1 is a diagram illustrating a schematic configuration of adetector circuit 10 according to a first embodiment of the present invention. InFIG. 1 , one end of aninput matching circuit 2, and abias circuit 6 for supplying an amplifyingtransistor 1 with a bias are connected to a base of the amplifyingtransistor 1. One end of anoutput matching circuit 3 is connected to a collector of the amplifyingtransistor 1. Aninput terminal 4 is connected to the other end of theinput matching circuit 2, and the other end of theoutput matching circuit 3 is connected to anoutput terminal 5. - The
detector circuit 10, which is connected to the base of the amplifyingtransistor 1, includes a detectingresistor 11 and a current-voltage conversion circuit 12. One end of the detectingresistor 11 is connected to a connecting point at which thebias circuit 6 and the base of the amplifyingtransistor 1 are connected with each other, and the detectingresistor 11 detects a part of a bias current flowing from thebias circuit 6. The current-voltage conversion circuit 12, which is connected to the other end of the detectingresistor 11, transforms to a voltage a part of the bias current flowing through the detectingresistor 11. - An operation of the
detector circuit 10 according to the first embodiment of the present invention will be described. - The bias current, which is supplied from the
bias circuit 6 to the amplifyingtransistor 1, is set so as to allow a desired collector current to flow through the amplifyingtransistor 1. In addition, a radio frequency signal is inputted from theinput terminal 4, amplified by the amplifyingtransistor 1, and then outputted from theoutput terminal 5. When power of the radio frequency signal inputted from theinput terminal 4 increases, a voltage at the base of the amplifyingtransistor 1 fluctuates greatly. In accordance therewith, a bias current supplied from thebias circuit 6 to the amplifyingtransistor 1 also fluctuates greatly. - At the same time, a part of the bias current flowing into the detecting
resistor 11 of thedetector circuit 10 also fluctuates greatly. The current is converted to a voltage by the current-voltage conversion circuit 12. To get a DC voltage, the voltage which appears at adetector output terminal 9 is processed in a smoothing circuit (not shown). As a result, a detection voltage uniquely corresponding to an input power level is defined. - An example of a setting range for the detecting
resistor 11 will be described. - A voltage outputted from the current-
voltage conversion circuit 12 fluctuates depending on the current flowing into thedetector circuit 10. Generally, the output voltage from thedetector circuit 10 is connected to an A/D converter of an RF-IC or a baseband IC. Accordingly, the output voltage may be approximately 2.4 V at a maximum due to the limitation of the supply voltage to the ICs. Further, the smaller the bias current is set, the wider the dynamic range can be. For this reason, the detectingresistor 11 has a preferable value of about several kΩ, and the detectingresistor 11 is set from 1 kΩ to 10 kΩ. Accordingly, thedetector circuit 10 is configured so as to have high impedance, and exert little influence on the amplifyingtransistor 1. -
FIG. 2 is a diagram illustrating in detail an example of adetector circuit 10 according to the first embodiment of the present invention where a bipolar transistor is employed for the current-voltage conversion circuit 12. InFIG. 2 , an example of thebias circuit 6 is also illustrated in detail, which is disclosed in Japanese Patent No. 3847756. - The
bias circuit 6 includes bipolar transistors 13-15, resistors 16-19, andpower source terminals bipolar transistor 13 is connected to a base of the amplifyingtransistor 1 via aresistor 22. Theresistor 22 is a resistor for circuit stability. An operation of thebias circuit 6 is disclosed in Japanese Patent No. 3847756 and a description thereof will be omitted. - The
detector circuit 10 shown inFIG. 2 employs abipolar transistor 23 as the current-voltage conversion circuit 12. An emitter of thebipolar transistor 23 is connected to a ground. A base of thebipolar transistor 23 is connected to the emitter of thebipolar transistor 13 in thebias circuit 6 via a detectingresistor 11. A collector of thebipolar transistor 23 is connected to thepower source terminal 21 of thebias circuit 6 via aresistor 24, and also connected to thedetector output terminal 9. A smoothing circuit, composed of aresistor 25 and acapacitor 26, is connected with thedetector output terminal 9 in order to detect only DC components in the detection voltage. -
FIG. 3 is a diagram illustrating relationship between an output power level of the amplifyingtransistor 1 and the detection voltage according to the first embodiment. This result is measured under the condition that the frequency of an RF signal inputted to the amplifyingtransistor 1 is 2 GHz and the source voltage is 3.5 V. From the drawing, positive correlationship between the output power level and the detection voltage can be seen. -
FIG. 4 shows an example of another bias circuit. Thebias circuit 6 comprises series-connectedbipolar transistor 27 and 28, which is connected to the base of thebipolar transistor 13. Especially, when superior receiver band noise characteristic is required for the radio frequency power amplifier, or when an operation at higher output power is required for the radio frequency power amplifier, thebias circuit 6 shown inFIG. 4 is preferably employed. -
FIG. 5 illustrates an example of another detector circuit. Afield effect transistor 29 is employed for the current-voltage conversion circuit 12 in thedetector circuit 10 instead of thebipolar transistor 23. As the field effect transistor approximately shows square-low current-voltage characteristics in a saturation region, thefield effect transistor 29 may be employed when relationship between input power and the detection voltage is designed to represent a square-law curve. -
FIG. 6 is a diagram illustrating in detail an example of adetector circuit 10 according to a second embodiment of the present invention. Thedetector circuit 10 of the second embodiment is different from thedetector circuit 10 of the first embodiment as shown inFIG. 2 in that a portion, at which a voltage is detected, of thebipolar transistor 23, is replaced with the emitter instead of the collector. Operations of other components are basically the same as described for the first embodiment and a detailed description thereof will be omitted. - In the second embodiment, the
bipolar transistor 23 is an emitter follower. As thebipolar transistor 23 has low power gain, high input impedance and low output impedance, it serves as an impedance-converter or buffer amplifier. For this reason, thedetector circuit 10 according to the second embodiment is preferably used when a detection voltage is designed to be suppressed or when an influence of impedance fluctuation of thebias circuit 6 on the detectingoutput terminal 9 is desired to be reduced. Note that, as described in the first embodiment, thefield effect transistor 29 may be employed instead of thebipolar transistor 23 as the current-voltage conversion circuit 12. -
FIG. 7 is a diagram illustrating in detail an example of adetector circuit 10 according to a third embodiment of the present invention. Thedetector circuit 10 of the third embodiment is different from thedetector circuit 10 of the first embodiment as shown inFIG. 2 in that thedetector circuit 10 of the third embodiment additionally hasresistors current partition transistor 30, and is connected to an emitter of thecurrent partition transistor 30. Operations of other components are basically the same as described for the first embodiment and a detailed description thereof will be omitted. - A base of the
current partition transistor 30 is connected to a base of thebipolar transistor 13 via theresistor 31. A collector of thecurrent partition transistor 30 is connected to a collector of thebipolar transistor 13. The emitter of thecurrent partition transistor 30 is grounded via theresistor 32, and connected to a base of abipolar transistor 23 via the detectingresistor 11. - In the third embodiment, a current detected by the
detector circuit 10 is not same as the current of thebipolar transistor 13 which supplies the amplifyingtransistor 1 with a bias current. As described above, when a transistor connected to the detectingresistor 11 of thedetector circuit 10 is separated from a transistor for supplying a bias, an effect on the bias circuit 6 (e.g., loss and stability) exerted by thedetector circuit 10 is reduced. In addition, the value of the detection current can be set independently of a bias current to the amplifyingtransistor 1. Therefore, a power detection range can be wider. - An example of a setting range of each of the
resistors - The
resistor 31 is preferably set so as to range from a few tens of ohms to a few hundreds of ohms in order to prevent the effect of the voltage rising on the base of thebipolar transistor 13 caused by a radio frequency signal. However, in some cases, for example, where the base of thebipolar transistor 13 is grounded via a capacitor (not shown), theresistor 31 may be set at zero ohm. Theresistor 32 is set at approximately 1 kΩ at a minimum, and set at approximately 10 kΩ at a maximum in order to reduce the collector current of thecurrent partition transistor 30. - In the third embodiment, an exemplary configuration where
resistors current partition transistor 30 are arranged in addition to the configuration shown inFIG. 2 is described. However, the similar effects can be also provided in the cases where theresistors current partition transistor 30 are arranged in addition to each of the configurations shown inFIGS. 4 through 6 . - (An Example of Configuration of a Wireless Communication System Where the Detector Circuit of the Present Invention is Used)
-
FIGS. 8 through 11 are diagrams each illustrating an exemplary configuration of a wireless communication system using thedetector circuit 10 according to any one of the first through third embodiments of the present invention. - In
FIG. 8 , a radio frequency power amplifier is realized by a two-stage amplifier including a driverstage amplification circuit 33 and a finalstage amplification circuit 34. Theinput matching circuit 2 is connected to an input of the driverstage amplification circuit 33. Theoutput matching circuit 3 is connected to an output of the finalstage amplification circuit 34. A driver stage bias circuit 6 a is connected to the driverstage amplification circuit 33, and a finalstage bias circuit 6 b is connected to the finalstage amplification circuit 34, respectively. Thedetector circuit 10 is connected to the finalstage bias circuit 6 b. A DC-DC converter 35 is connected to both the driverstage amplification circuit 33 and the finalstage amplification circuit 34, such that a voltage obtained by decreasing or increasing a voltage from a battery (not shown) is supplied to both the driverstage amplification circuit 33 and the finalstage amplification circuit 34. -
FIG. 9 is a diagram illustrating a configuration where acontrol circuit 36 is arranged in addition to the configuration of the radio frequency power amplifier shown inFIG. 8 for directly controlling output power by reading the detection voltage. An output voltage from thedetector circuit 10, which is connected to the finalstage bias circuit 6 b, is applied to thecontrol circuit 36. Outputs of thecontrol circuit 36 are connected to control terminals of the driver stage bias circuit 6 a, the finalstage bias circuit 6 b, and the DC-DC converter 35, respectively. In thecontrol circuit 36, necessary calculation is performed depending on the purpose. - Specifically, the
control circuit 36 performs feedback processing such that when the detection voltage is higher, a supply voltage to each of thebias circuits 6 a and 6 b or an output voltage from the DC-DC converter 35 is decreased in order to keep the output power from the radio frequency power amplifier constant. - Alternatively, by storing relationship between an output power level and a detection voltage in a memory previously, such as a look-up table (LUT), a supply voltage to each of the
bias circuits 6 a and 6 b or an output voltage from the DC-DC converter 35 is controlled to obtain a desired output power level, that is, the detection voltage. - In
FIG. 9 , an example where thedetector circuit 10 is connected to the finalstage bias circuit 6 b is shown. However, thedetector circuit 10 may be connected to the driver stage bias circuit 6 a as shown inFIG. 10 . Note that the latter configuration is only applicable to the case where the input power to the driverstage amplification circuit 33 is high (e.g., 10 dBm or above) or a voltage detected by an A/D converter in an RF-IC or a baseband IC is relatively-precise. - Further,
detector circuits 10 a and 10 b may be connected to the driver stage bias circuit 6 a and the finalstage bias circuit 6 b, respectively, as shown inFIG. 11 . This configuration is effective in the case where, for example, concurrent operations of the driverstage amplification circuit 33 and the finalstage amplification circuit 34 are inhibited, by alternatively switching on and off the driver stage bias circuit 6 a and the finalstage bias circuit 6 b. - While the invention has been described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is understood that numerous other modifications and variations can be devised without departing from the scope of the invention.
Claims (16)
1-18. (canceled)
19. A detector circuit used for a power amplifier circuit including an amplifying transistor and a bias circuit supplying the amplifying transistor with a bias current, the detector circuit comprising:
a current partition transistor having a collector and a base connected to a collector and a base, respectively, of an emitter follower transistor of the bias circuit supplying a base of the amplifying transistor with a bias current;
a resistor, having one end connected to an emitter of the current partition transistor, for detecting a part of an emitter current supplied from the current partition transistor; and
a current-voltage conversion circuit, connected to the other end of the resistor, for coverting a current flowing through the resistor into a voltage.
20. The detector circuit according to claim 19 , wherein a bipolar transistor is employed as the current-voltage conversion circuit.
21. The detector circuit according to claim 19 , wherein a field effect transistor is employed as the current-voltage conversion circuit.
22. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current; and
a detector circuit according to claim 19 , which is connected to the driver stage bias circuit.
23. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current; and
a detector circuit according to claim 19 , which is connected to the driver stage bias circuit.
24. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current; and
a detector circuit according to claim 19 , which is connected to the final stage bias circuit.
25. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current; and
a detector circuit according to claim 19 , which is connected to the final stage bias circuit.
26. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a first detector circuit according to claim 19 , which is connected to the driver stage bias circuit; and
a second detector circuit according to claim 19 , which is connected to the final stage bias circuit.
27. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a first detector circuit according to claim 19 , which is connected to the driver stage bias circuit; and
a second detector circuit according to claim 19 , which is connected to the final stage bias circuit.
28. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a first detector circuit according to claim 19 , which is connected to the driver stage bias circuit; and
a second detector circuit according to claim 19 , which is connected to the final stage bias circuit.
29. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a first detector circuit according to claim 19 , which is connected to the driver stage bias circuit; and
a second detector circuit according to claim 19 , which is connected to the final stage bias circuit.
30. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a detector circuit according to claim 19 , which is connected to the final stage bias circuit, and
a control circuit for controlling the bias currents from the driver stage bias circuit and the final stage bias circuit in accordance with a value of a voltage outputted from the detector circuit.
31. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a detector circuit according to claim 19 , which is connected to the final stage bias circuit, and
a control circuit for controlling the bias currents from the driver stage bias circuit and the final stage bias circuit in accordance with a value of a voltage outputted from the detector circuit.
32. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a DC-DC converter for supplying each of an output terminal of the driver stage amplifier circuit and an output terminal of the final stage amplifier circuit with a voltage;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a detector circuit according to claim 19 , which is connected to the final stage bias circuit, and
a control circuit for controlling, in accordance with a value of a voltage outputted from the detector circuit, the bias currents from the driver stage bias circuit and the final stage bias circuit, and the voltages outputted from the DC-DC converter.
33. A wireless communication system using a radio frequency power amplifier including a two stage amplifier circuit, the wireless communication system comprising:
a driver stage amplifier circuit for amplifying a radio frequency signal;
a final stage amplifier circuit for amplifying an output from the driver stage amplifier circuit;
a DC-DC converter for supplying each of an output terminal of the driver stage amplifier circuit and an output terminal of the final stage amplifier circuit with a voltage;
a driver stage bias circuit for supplying an input terminal of the driver stage amplifier circuit with a bias current;
a final stage bias circuit for supplying an input terminal of the final stage amplifier circuit with a bias current;
a detector circuit according to claim 19 , which is connected to the final stage bias circuit, and
a control circuit for controlling, in accordance with a value of a voltage outputted from the detector circuit, the bias currents from the driver stage bias circuit and the final stage bias circuit, and the voltages outputted from the DC-DC converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/164,420 US20110241783A1 (en) | 2008-08-01 | 2011-06-20 | Detector circuit and system for a wireless communication |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008199982A JP2010041233A (en) | 2008-08-01 | 2008-08-01 | Detector circuit, and wireless communication system |
JP2008-199982 | 2008-08-01 | ||
US12/512,684 US7990221B2 (en) | 2008-08-01 | 2009-07-30 | Detector circuit and system for a wireless communication |
US13/164,420 US20110241783A1 (en) | 2008-08-01 | 2011-06-20 | Detector circuit and system for a wireless communication |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/512,684 Division US7990221B2 (en) | 2008-08-01 | 2009-07-30 | Detector circuit and system for a wireless communication |
Publications (1)
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US20110241783A1 true US20110241783A1 (en) | 2011-10-06 |
Family
ID=41607703
Family Applications (2)
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US12/512,684 Expired - Fee Related US7990221B2 (en) | 2008-08-01 | 2009-07-30 | Detector circuit and system for a wireless communication |
US13/164,420 Abandoned US20110241783A1 (en) | 2008-08-01 | 2011-06-20 | Detector circuit and system for a wireless communication |
Family Applications Before (1)
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US12/512,684 Expired - Fee Related US7990221B2 (en) | 2008-08-01 | 2009-07-30 | Detector circuit and system for a wireless communication |
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US (2) | US7990221B2 (en) |
JP (1) | JP2010041233A (en) |
CN (1) | CN101640530A (en) |
Cited By (2)
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CN103630822A (en) * | 2012-08-21 | 2014-03-12 | 罗森伯格(上海)通信技术有限公司 | Method and apparatus for monitoring state of RF power amplifier |
US20160156229A1 (en) * | 2013-04-23 | 2016-06-02 | Panasonic Corporation | Wireless power transmission apparatus |
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TWI428611B (en) * | 2010-09-10 | 2014-03-01 | Ind Tech Res Inst | Zero bias power detector |
US8237507B1 (en) * | 2011-03-14 | 2012-08-07 | Broadcom Corporation | Method and system for transmitter linearization |
WO2014109090A1 (en) * | 2013-01-09 | 2014-07-17 | 株式会社村田製作所 | High-frequency amplifier circuit |
JP2016192590A (en) * | 2015-03-30 | 2016-11-10 | 株式会社村田製作所 | Power amplification module |
CN108736839A (en) * | 2017-04-16 | 2018-11-02 | 天津大学(青岛)海洋工程研究院有限公司 | It is a kind of improve efficient E against F power-like amplifier carrier frequencies match circuit |
CN109428554A (en) * | 2017-09-04 | 2019-03-05 | 北京泰龙电子技术有限公司 | A kind of radio-frequency power supply power amplifier overvoltage crowbar |
US11043919B2 (en) | 2018-07-26 | 2021-06-22 | Samsung Electronics Co., Ltd. | Power amplifier |
TWI743740B (en) * | 2020-04-10 | 2021-10-21 | 立積電子股份有限公司 | Power detector |
US11374440B2 (en) * | 2020-07-31 | 2022-06-28 | Renesas Electronics America Inc. | Wireless power charging |
CN112653403B (en) * | 2020-12-24 | 2023-03-14 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
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US6275687B1 (en) * | 1998-11-30 | 2001-08-14 | Conexant Systems, Inc. | Apparatus and method for implementing a low-noise amplifier and mixer |
JP2001016116A (en) | 1999-07-02 | 2001-01-19 | Nec Corp | Portable radio equipment |
US6448855B1 (en) | 2000-04-13 | 2002-09-10 | Koninklijke Philips Electronics N.V. | Accurate power detection circuit for use in a power amplifier |
JP3937426B2 (en) * | 2001-07-16 | 2007-06-27 | 日本電気株式会社 | Preamplifier circuit |
US6531925B2 (en) * | 2001-07-17 | 2003-03-11 | David C. Scott | Heterojunction bipolar transistor optoelectronic transimpedance amplifier using the first transistor as an optical detector |
JP2004140633A (en) * | 2002-10-18 | 2004-05-13 | Hitachi Ltd | Electronic component for high-frequency power amplification and wireless communication system |
WO2004112239A1 (en) | 2003-06-18 | 2004-12-23 | Koninklijke Philips Electronics N.V. | Ouput power detection circuit |
JP3847756B2 (en) | 2004-02-25 | 2006-11-22 | 松下電器産業株式会社 | High frequency amplifier circuit |
-
2008
- 2008-08-01 JP JP2008199982A patent/JP2010041233A/en active Pending
-
2009
- 2009-07-28 CN CN200910165005.9A patent/CN101640530A/en active Pending
- 2009-07-30 US US12/512,684 patent/US7990221B2/en not_active Expired - Fee Related
-
2011
- 2011-06-20 US US13/164,420 patent/US20110241783A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103630822A (en) * | 2012-08-21 | 2014-03-12 | 罗森伯格(上海)通信技术有限公司 | Method and apparatus for monitoring state of RF power amplifier |
US20160156229A1 (en) * | 2013-04-23 | 2016-06-02 | Panasonic Corporation | Wireless power transmission apparatus |
US9882431B2 (en) * | 2013-04-23 | 2018-01-30 | Panasonic Intellectual Property Management Co., Ltd. | Wireless power transmitter apparatus receiving load-modulated signal transmitted from wireless power receiver apparatus by changing power consumption of wireless power receiver apparatus |
Also Published As
Publication number | Publication date |
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US20100026390A1 (en) | 2010-02-04 |
CN101640530A (en) | 2010-02-03 |
US7990221B2 (en) | 2011-08-02 |
JP2010041233A (en) | 2010-02-18 |
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