US20180102798A9 - Mobile device, radio transceiver circuit, and impedance adjustment device - Google Patents
Mobile device, radio transceiver circuit, and impedance adjustment device Download PDFInfo
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- US20180102798A9 US20180102798A9 US15/184,096 US201615184096A US2018102798A9 US 20180102798 A9 US20180102798 A9 US 20180102798A9 US 201615184096 A US201615184096 A US 201615184096A US 2018102798 A9 US2018102798 A9 US 2018102798A9
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- adjusting device
- power amplifier
- impedance adjusting
- baseband processor
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- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/36—Preventing errors by testing or debugging software
- G06F11/3668—Software testing
- G06F11/3672—Test management
- G06F11/3688—Test management for test execution, e.g. scheduling of test suites
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/2221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test input/output devices or peripheral units
-
- 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
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/24—Arrangements for testing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/423—Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
-
- 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
- H04B2001/0408—Circuits with power amplifiers
Definitions
- the present invention relates to an impedance adjusting device, and particularly relates to an impedance adjusting device applied in matching different power amplifiers.
- the present invention proposes an impedance adjusting device and a mobile phone device applying the impedance adjusting device.
- An embodiment of the present invention provides a mobile phone device.
- the mobile phone device comprises a baseband processor, an antenna, a duplexer and a radio frequency transceiver circuit.
- the antenna is used to receive and send a plurality of radio frequency signals.
- the duplexer is electrically connected to the antenna.
- the radio frequency transceiver circuit is connected to the baseband processor and the duplexer, respectively.
- the radio frequency transceiver circuit comprises a first power amplifier and an impedance adjusting device.
- the first power amplifier has a first output impedance.
- the impedance adjusting device is electrically connected between the first power amplifier and the duplexer, and comprises at least one switch, wherein the baseband processor is connected to and control the at least one switch of the impedance adjusting device to adjust an impedance value of the impedance adjusting device, such that a first load impedance of the first power amplifier and the first output impedance match one another.
- An embodiment of the present invention provides a radio frequency transceiver circuit.
- the radio frequency transceiver circuit comprises a first power amplifier and an impedance adjusting device.
- the first power amplifier has a first output impedance.
- the impedance adjusting device is electrically connected to the first power amplifier, and comprises at least one switch, wherein the impedance adjusting device controls the at least one switch according to a first control signal received from a baseband processor to adjust an impedance value of the impedance adjusting device, such that a first load impedance of the first power amplifier and the first output impedance match one another.
- An embodiment of the present invention provides an impedance adjusting device applicable to matching a first power amplifier or a second power amplifier.
- the impedance adjusting device comprises a first switch and a second switch.
- the first switch and the second switch are used to switch an impedance value of the impedance adjusting device to a first impedance value or a second impedance value, wherein the impedance adjusting device switches the impedance value to the first impedance value according to a first control signal received from a baseband processor to adjust a first load impedance of the first power amplifier, such that the first load impedance and a first output impedance of the first power amplifier match one another.
- FIGS. 1A and 1B are block diagrams illustrating a mobile phone device 10 of the present invention by way of example in accordance with a first embodiment of the present invention.
- FIGS. 2A and 2B are block diagrams illustrating a radio frequency transceiver circuit 20 of the present invention by way of example in accordance with a second embodiment of the present invention.
- FIGS. 3A and 3B are block diagrams illustrating an impedance adjusting device 30 of the present invention by way of example in accordance with a third embodiment of the present invention.
- FIGS. 1A and 1B are block diagrams illustrating a mobile phone device 10 of the present invention by way of example in accordance with a first embodiment of the present invention.
- the mobile phone device 10 comprises an antenna 110 , a duplexer 120 , a radio frequency transceiver circuit 130 and a baseband processor 140 .
- the antenna 110 is used to receive and send a plurality of radio frequency signals.
- the duplexer 120 is electrically connected to the antenna 110 and the radio frequency transceiver circuit 130 , respectively.
- the radio frequency transceiver circuit 130 is electrically connected to the baseband processor 140 .
- the radio frequency transceiver circuit 130 includes a radio frequency processing circuit 131 , a low noise amplifier 132 , a first power amplifier 133 and an impedance adjusting device 134 .
- the low noise amplifier 132 is used to filter out noises in a radio frequency signal received by the antenna 110 .
- the first power amplifier 133 is used to amplify the power of the radio frequency signal and then output it to the antenna, and has a first output impedance.
- the impedance adjusting device 134 is electrically connected between the first power amplifier 133 and the duplexer 120 .
- the impedance adjusting device 134 is an array composed of an variable capacitor, an inductor and at least one switch, and has an adjustable impedance value.
- the radio frequency processing circuit 131 includes relevant analogue circuits such as a frequency mixer circuit, an oscillator circuit, an IQ modulator circuit, a phase-locked loop, a frequency demultiplier circuit, an IQ demodulator circuit, and the like.
- the baseband processor 140 is connected to the impedance adjusting device 134 , and controls the at least one switch of the impedance adjusting device 134 to adjust an impedance value of the impedance adjusting device 134 .
- a first load impedance of the first power amplifier 133 is an equivalent impedance of the impedance adjusting device 134 plus an equivalent impedance of a next-stage duplexer 120 .
- the baseband processor 140 controls the at least one switch of the impedance adjusting device 134 via a Mobile Industry Processor Interface (MIPI) of the baseband processor to adjust the impedance value of the impedance adjusting device 134 , for example, sending a first control signal to the impedance adjusting device 134 , such that a first load impedance of the first power amplifier 133 and the first output impedance match one another.
- the first output impedance may equal a conjugate impedance of the first load impedance, such that the energy transmitted from the first power amplifier 133 to the first load impedance is maximal.
- a designer can calculate in advance, according to a Smith chart, the impedance value of the impedance adjusting device 134 required to match the first output impedance.
- the designer of the mobile phone device 10 when a designer of the mobile phone device 10 replaces the first power amplifier 133 in the mobile phone device 10 with a second power amplifier 135 based on design considerations, for example, replaces with a power amplifier with another frequency band based on the frequency band consideration, the designer of the mobile phone device 10 sets the baseband processor 140 such that the baseband processor 140 sends a second control signal to the impedance adjusting device 134 .
- the impedance adjusting device 134 adjusts the impedance value of the impedance adjusting device 134 according to the second control signal such that a second load impedance of the second power amplifier 135 and a second output impedance of the second power amplifier 135 match one another.
- a second load impedance of the second power amplifier 135 is an equivalent impedance of the impedance adjusting device 134 plus an equivalent impedance of a next-stage duplexer 120 .
- the second output impedance may equal a conjugate impedance of the second load impedance such that the energy transmitted from the second power amplifier 135 to the second load impedance is maximal.
- a designer can calculate in advance, according to a Smith chart, the impedance value of the impedance adjusting device 134 required to match the second output impedance.
- FIGS. 2A and 2B are block diagrams illustrating a radio frequency transceiver circuit 20 of the present invention by way of example in accordance with a second embodiment of the present invention.
- the radio frequency transceiver circuit 20 comprises a first power amplifier 21 and an impedance adjusting device 22 .
- the first power amplifier 21 has a first output impedance, and is electrically connected to an impedance adjusting device 22 .
- the impedance adjusting device 22 is an array composed of an variable capacitor, an inductor and at least one switch, and has an adjustable impedance value.
- the impedance adjusting device 22 controls the at least one switch of the impedance adjusting device 22 according to a first control signal received from a baseband processor 23 to adjust an impedance value of the impedance adjusting device, such that a first load impedance of the first power amplifier 21 and the first output impedance match one another.
- the first output impedance may equal a conjugate impedance of the first load impedance such that the energy transmitted from the first power amplifier 21 to the first load impedance is maximal.
- the impedance adjusting device 22 controls the at least one switch according to a second control signal received from a baseband processor 23 to adjust the impedance value of the impedance adjusting device, such that a second load impedance of the second power amplifier 24 and a second output impedance of the second power amplifier 24 match one another.
- the second output impedance may equal a conjugate impedance of the second load impedance such that the energy transmitted from the second power amplifier 24 to the second load impedance is maximal.
- FIGS. 3A and 3B are block diagrams illustrating an impedance adjusting device 30 of the present invention by way of example in accordance with a third embodiment of the present invention.
- the impedance adjusting device 30 comprises a first switch 301 , a second switch 302 , a first impeder 303 and a second impeder 304 .
- the first switch 301 and the second switch 302 are electrically connected to the first impeder 303 and the second impeder 304 , respectively.
- the impedance adjusting device 30 provides the first impeder 303 or the second impeder 304 as the load impeder of a first power amplifier 31 by switching the first switch 301 and the second switch 302 .
- the impedance adjusting device 30 turns on the first switch 301 and turns off the second switch 302 according to a first control signal received from a baseband processor 32 to provide the first impeder 303 , such that the impedance of the first impeder 303 and a first output impedance of the first power amplifier 31 match one another.
- a designer can calculate in advance, according to a Smith chart, the impedance value of the first impeder 303 required to match the first output impedance.
- the impedance adjusting device 30 when the impedance adjusting device 30 is changed to match a second output impedance of a second power amplifier 33 , the impedance adjusting device 30 turns on the second switch 302 and turns off the first switch 301 according to a second control signal received from a baseband processor 32 to provide the second impeder 304 , such that the impedance of the second impeder 304 and a second output impedance of the second power amplifier 33 match one another.
- a designer can calculate in advance, according to a Smith chart, the impedance value of the second impedance 304 required to match the second output impedance.
- the impedance adjusting device as described in the first to third embodiments of the present invention can be applied in a common radio frequency transmitter circuit, and can be used as a load impeder of which the impedance matches the impedance of each power amplifier in the radio frequency transmitter circuit.
- power amplifiers applied at different bandwidths are generally used in wireless mobile devices of LTE or CDMA.
- the matching impeder networks paired with the power amplifiers also need to be replaced accordingly.
- the impedance adjusting device of the present invention if the impedance adjusting device of the present invention is respectively carried at a load end of each power amplifier, the designer only needs to send a control signal via a baseband processor to the impedance adjusting device so as to adjust the impedance value of the impedance adjusting device, without replacing the matching impeder network paired with the power amplifier. Therefore, the application of the impedance adjusting device of the present invention enables a designer of a radio frequency device not need to replace an impedance matching network corresponding to the power amplifier in plan of replacing with a different power amplifier, thus effectively saving a cost of development.
- the impedance adjusting device as described in the first to third embodiments of the present invention can design according to users' need a plurality of different groups of matching impedances, the number of which can change with the users' needs.
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Function (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
- The present invention relates to an impedance adjusting device, and particularly relates to an impedance adjusting device applied in matching different power amplifiers.
- In a common mobile communication device, matching impedance networks of a power amplifier, such as a broadband pulse amplitude modulation power amplifier, in a radio frequency circuit are all paired in a customized manner. Once there is a need for a replacement with a different power amplifier, the customized matching impedance network also needs to be replaced accordingly, which increases the production cost. In view of this, the present invention proposes an impedance adjusting device and a mobile phone device applying the impedance adjusting device.
- An embodiment of the present invention provides a mobile phone device. The mobile phone device comprises a baseband processor, an antenna, a duplexer and a radio frequency transceiver circuit. The antenna is used to receive and send a plurality of radio frequency signals. The duplexer is electrically connected to the antenna. The radio frequency transceiver circuit is connected to the baseband processor and the duplexer, respectively. The radio frequency transceiver circuit comprises a first power amplifier and an impedance adjusting device. The first power amplifier has a first output impedance. The impedance adjusting device is electrically connected between the first power amplifier and the duplexer, and comprises at least one switch, wherein the baseband processor is connected to and control the at least one switch of the impedance adjusting device to adjust an impedance value of the impedance adjusting device, such that a first load impedance of the first power amplifier and the first output impedance match one another.
- An embodiment of the present invention provides a radio frequency transceiver circuit. The radio frequency transceiver circuit comprises a first power amplifier and an impedance adjusting device. The first power amplifier has a first output impedance. The impedance adjusting device is electrically connected to the first power amplifier, and comprises at least one switch, wherein the impedance adjusting device controls the at least one switch according to a first control signal received from a baseband processor to adjust an impedance value of the impedance adjusting device, such that a first load impedance of the first power amplifier and the first output impedance match one another.
- An embodiment of the present invention provides an impedance adjusting device applicable to matching a first power amplifier or a second power amplifier. The impedance adjusting device comprises a first switch and a second switch. The first switch and the second switch are used to switch an impedance value of the impedance adjusting device to a first impedance value or a second impedance value, wherein the impedance adjusting device switches the impedance value to the first impedance value according to a first control signal received from a baseband processor to adjust a first load impedance of the first power amplifier, such that the first load impedance and a first output impedance of the first power amplifier match one another.
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FIGS. 1A and 1B are block diagrams illustrating amobile phone device 10 of the present invention by way of example in accordance with a first embodiment of the present invention. -
FIGS. 2A and 2B are block diagrams illustrating a radiofrequency transceiver circuit 20 of the present invention by way of example in accordance with a second embodiment of the present invention. -
FIGS. 3A and 3B are block diagrams illustrating an impedance adjusting device 30 of the present invention by way of example in accordance with a third embodiment of the present invention. - Embodiments or examples of the accompanying drawings of the disclosure will be described as follows. The scope of the disclosure is not limited thereto. It will be appreciated by those skilled in the art that some modification, replacement and substitution can be made without departing from the spirit and architecture of the disclosure. In embodiments of the disclosure, element symbols may be used repeatedly, and several embodiments of the disclosure may share the same element symbols. However, a feature element used by one embodiment is not necessarily used by another embodiment.
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FIGS. 1A and 1B are block diagrams illustrating amobile phone device 10 of the present invention by way of example in accordance with a first embodiment of the present invention. In the first embodiment of the present invention, as shown inFIG. 1A , themobile phone device 10 comprises anantenna 110, aduplexer 120, a radiofrequency transceiver circuit 130 and abaseband processor 140. Theantenna 110 is used to receive and send a plurality of radio frequency signals. Theduplexer 120 is electrically connected to theantenna 110 and the radiofrequency transceiver circuit 130, respectively. The radiofrequency transceiver circuit 130 is electrically connected to thebaseband processor 140. In the first embodiment of the present invention, the radiofrequency transceiver circuit 130 includes a radiofrequency processing circuit 131, alow noise amplifier 132, afirst power amplifier 133 and an impedance adjustingdevice 134. Thelow noise amplifier 132 is used to filter out noises in a radio frequency signal received by theantenna 110. Thefirst power amplifier 133 is used to amplify the power of the radio frequency signal and then output it to the antenna, and has a first output impedance. The impedance adjustingdevice 134 is electrically connected between thefirst power amplifier 133 and theduplexer 120. The impedance adjustingdevice 134 is an array composed of an variable capacitor, an inductor and at least one switch, and has an adjustable impedance value. In the first embodiment of the present invention, the radiofrequency processing circuit 131 includes relevant analogue circuits such as a frequency mixer circuit, an oscillator circuit, an IQ modulator circuit, a phase-locked loop, a frequency demultiplier circuit, an IQ demodulator circuit, and the like. - In the first embodiment of the present invention, the
baseband processor 140 is connected to the impedance adjustingdevice 134, and controls the at least one switch of the impedance adjustingdevice 134 to adjust an impedance value of the impedance adjustingdevice 134. In the first embodiment of the present invention, a first load impedance of thefirst power amplifier 133 is an equivalent impedance of the impedance adjustingdevice 134 plus an equivalent impedance of a next-stage duplexer 120. Therefore, thebaseband processor 140 controls the at least one switch of the impedance adjustingdevice 134 via a Mobile Industry Processor Interface (MIPI) of the baseband processor to adjust the impedance value of the impedance adjustingdevice 134, for example, sending a first control signal to the impedance adjustingdevice 134, such that a first load impedance of thefirst power amplifier 133 and the first output impedance match one another. At this point, the first output impedance may equal a conjugate impedance of the first load impedance, such that the energy transmitted from thefirst power amplifier 133 to the first load impedance is maximal. Furthermore, in the first embodiment of the present invention, a designer can calculate in advance, according to a Smith chart, the impedance value of the impedance adjustingdevice 134 required to match the first output impedance. - In the first embodiment of the present invention, as shown in
FIG. 1B , when a designer of themobile phone device 10 replaces thefirst power amplifier 133 in themobile phone device 10 with asecond power amplifier 135 based on design considerations, for example, replaces with a power amplifier with another frequency band based on the frequency band consideration, the designer of themobile phone device 10 sets thebaseband processor 140 such that thebaseband processor 140 sends a second control signal to the impedance adjustingdevice 134. At this point, the impedance adjustingdevice 134 adjusts the impedance value of the impedance adjustingdevice 134 according to the second control signal such that a second load impedance of thesecond power amplifier 135 and a second output impedance of thesecond power amplifier 135 match one another. In the first embodiment of the present invention, a second load impedance of thesecond power amplifier 135 is an equivalent impedance of the impedance adjustingdevice 134 plus an equivalent impedance of a next-stage duplexer 120. At this point, the second output impedance may equal a conjugate impedance of the second load impedance such that the energy transmitted from thesecond power amplifier 135 to the second load impedance is maximal. Furthermore, in the first embodiment of the present invention, a designer can calculate in advance, according to a Smith chart, the impedance value of the impedance adjustingdevice 134 required to match the second output impedance. -
FIGS. 2A and 2B are block diagrams illustrating a radiofrequency transceiver circuit 20 of the present invention by way of example in accordance with a second embodiment of the present invention. In the second embodiment of the present invention, as shown inFIG. 2A , the radiofrequency transceiver circuit 20 comprises afirst power amplifier 21 and an impedance adjustingdevice 22. Thefirst power amplifier 21 has a first output impedance, and is electrically connected to an impedance adjustingdevice 22. The impedance adjustingdevice 22 is an array composed of an variable capacitor, an inductor and at least one switch, and has an adjustable impedance value. In the second embodiment of the present invention, theimpedance adjusting device 22 controls the at least one switch of theimpedance adjusting device 22 according to a first control signal received from abaseband processor 23 to adjust an impedance value of the impedance adjusting device, such that a first load impedance of thefirst power amplifier 21 and the first output impedance match one another. At this point, the first output impedance may equal a conjugate impedance of the first load impedance such that the energy transmitted from thefirst power amplifier 21 to the first load impedance is maximal. - In the second embodiment of the present invention, as shown in
FIG. 2B , when thefirst power amplifier 21 in the radiofrequency transceiver circuit 20 is replaced with asecond power amplifier 24, theimpedance adjusting device 22 controls the at least one switch according to a second control signal received from abaseband processor 23 to adjust the impedance value of the impedance adjusting device, such that a second load impedance of thesecond power amplifier 24 and a second output impedance of thesecond power amplifier 24 match one another. At this point, the second output impedance may equal a conjugate impedance of the second load impedance such that the energy transmitted from thesecond power amplifier 24 to the second load impedance is maximal. -
FIGS. 3A and 3B are block diagrams illustrating an impedance adjusting device 30 of the present invention by way of example in accordance with a third embodiment of the present invention. In the third embodiment of the present invention, as shown inFIG. 3A , the impedance adjusting device 30 comprises afirst switch 301, asecond switch 302, afirst impeder 303 and asecond impeder 304. As shown inFIG. 3A , thefirst switch 301 and thesecond switch 302 are electrically connected to thefirst impeder 303 and thesecond impeder 304, respectively. The impedance adjusting device 30 provides thefirst impeder 303 or thesecond impeder 304 as the load impeder of afirst power amplifier 31 by switching thefirst switch 301 and thesecond switch 302. In the third embodiment of the present invention, the impedance adjusting device 30 turns on thefirst switch 301 and turns off thesecond switch 302 according to a first control signal received from abaseband processor 32 to provide thefirst impeder 303, such that the impedance of thefirst impeder 303 and a first output impedance of thefirst power amplifier 31 match one another. Furthermore, in the third embodiment of the present invention, a designer can calculate in advance, according to a Smith chart, the impedance value of thefirst impeder 303 required to match the first output impedance. - In the third embodiment of the present invention, as shown in
FIG. 3B , when the impedance adjusting device 30 is changed to match a second output impedance of asecond power amplifier 33, the impedance adjusting device 30 turns on thesecond switch 302 and turns off thefirst switch 301 according to a second control signal received from abaseband processor 32 to provide thesecond impeder 304, such that the impedance of thesecond impeder 304 and a second output impedance of thesecond power amplifier 33 match one another. Furthermore, in the third embodiment of the present invention, a designer can calculate in advance, according to a Smith chart, the impedance value of thesecond impedance 304 required to match the second output impedance. - The impedance adjusting device as described in the first to third embodiments of the present invention can be applied in a common radio frequency transmitter circuit, and can be used as a load impeder of which the impedance matches the impedance of each power amplifier in the radio frequency transmitter circuit. For example, power amplifiers applied at different bandwidths are generally used in wireless mobile devices of LTE or CDMA. When a designer wants to replace some of the power amplifiers, the matching impeder networks paired with the power amplifiers also need to be replaced accordingly. At this point, if the impedance adjusting device of the present invention is respectively carried at a load end of each power amplifier, the designer only needs to send a control signal via a baseband processor to the impedance adjusting device so as to adjust the impedance value of the impedance adjusting device, without replacing the matching impeder network paired with the power amplifier. Therefore, the application of the impedance adjusting device of the present invention enables a designer of a radio frequency device not need to replace an impedance matching network corresponding to the power amplifier in plan of replacing with a different power amplifier, thus effectively saving a cost of development. In addition, the impedance adjusting device as described in the first to third embodiments of the present invention can design according to users' need a plurality of different groups of matching impedances, the number of which can change with the users' needs.
- Although the present invention is disclosed above with preferred embodiments to enable those skilled in the art to understand the contents of the present invention more clearly, it will be understood by those skilled in the art that the can, on the basis of the present invention, easily design or modify the flow and use a mobile phone device, a radio frequency transceiver circuit and an impedance adjusting device to achieve the same purpose and/or achieve the same advantages of the embodiments described herein. Therefore, the scope of protection of the present invention should be subject to the scope as defined in the appended claims.
Claims (8)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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CN201510412278.4A CN105100343A (en) | 2015-07-14 | 2015-07-14 | Mobile phone and instrument control method and system using such method |
CN201510412278.6 | 2015-07-17 | ||
CN201510424768.6 | 2015-07-17 | ||
CN201510424768 | 2015-07-17 |
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US20170019134A1 US20170019134A1 (en) | 2017-01-19 |
US20180102798A9 true US20180102798A9 (en) | 2018-04-12 |
US10164668B2 US10164668B2 (en) | 2018-12-25 |
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US15/183,980 Expired - Fee Related US10621076B2 (en) | 2015-07-14 | 2016-06-16 | Methods for controlling mobile phones and instruments and systems using the same |
US15/184,096 Active US10164668B2 (en) | 2015-07-14 | 2016-06-16 | Mobile device, radio transceiver circuit, and impedance adjustment device |
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US15/183,980 Expired - Fee Related US10621076B2 (en) | 2015-07-14 | 2016-06-16 | Methods for controlling mobile phones and instruments and systems using the same |
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US10411659B2 (en) * | 2018-01-25 | 2019-09-10 | Cree, Inc. | RF power amplifier with frequency selective impedance matching network |
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US9807704B2 (en) | 2015-03-30 | 2017-10-31 | Ford Global Technologies, Llc | Key fob transmission compensation |
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Also Published As
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US20170019134A1 (en) | 2017-01-19 |
US20170019514A1 (en) | 2017-01-19 |
CN105100343A (en) | 2015-11-25 |
US10621076B2 (en) | 2020-04-14 |
CN111314538A (en) | 2020-06-19 |
US10164668B2 (en) | 2018-12-25 |
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