Classifications

• • 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
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
  • H04B1/50—Circuits using different frequencies for the two directions of communication
  • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
  • H01P1/00—Auxiliary devices
  • H01P1/10—Auxiliary devices for switching or interrupting
  • H01P1/15—Auxiliary devices for switching or interrupting by semiconductor devices
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
  • H01P1/00—Auxiliary devices
  • H01P1/18—Phase-shifters
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
  • H01P1/00—Auxiliary devices
  • H01P1/20—Frequency-selective devices, e.g. filters
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
  • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
  • H03H7/01—Frequency selective two-port networks
  • H03H7/0123—Frequency selective two-port networks comprising distributed impedance elements together with lumped impedance elements
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
  • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
  • H03H7/01—Frequency selective two-port networks
  • H03H7/0153—Electrical filters; Controlling thereof
  • H03H7/0161—Bandpass filters
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
  • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
  • H03H7/18—Networks for phase shifting
  • H03H7/19—Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
  • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
  • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
  • H03H7/463—Duplexers
• • 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
  • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
  • H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
  • H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
• • 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
  • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
• • 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
  • H04B1/06—Receivers
  • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
• • 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
  • H04B1/06—Receivers
  • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
  • H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• • 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
  • H04B1/06—Receivers
  • H04B1/16—Circuits
  • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
• • 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
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
  • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
  • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
• • 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
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
  • H04B1/44—Transmit/receive switching
  • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter

Definitions

• the invention relates to RF circuits, the z. B. can be used in front-end circuits of mobile devices use.
• Front-end circuits of mobile devices connect one or more receiving or transmitting amplifiers with one or more antennas. This connection is made via signal paths and RF-filters, which are interconnected so that the requirements it fills to the signal quality of the mobile devices ⁇ and simultaneously a plurality of transmission ⁇ systems and transmission frequencies can be used.
• US Pat. No. 7,212,789 B2 discloses HF circuits with a tunable duplexer.
• Receive frequencies can be used simultaneously, to increase the data transfer rate different
• two FDD receive frequencies can be used simultaneously with one FDD transmit frequency. It is also possible that two FDD transmit frequencies coincide with one receive frequency or multiple receive frequencies
• Tx Carrier Aggregation Tx Carrier Aggregation
• An RF circuit comprises for this purpose a diplexer, a first duplexer for a first frequency band and a first Duple ⁇ xer for a second frequency band.
• the diplexer has a ⁇ ers th port, a common port and a second port.
• the first duplexer for the first frequency band has a send port, a common port, and a receive port.
• the first duplexer for the second frequency band has also ei ⁇ NEN transmitting port, a common port and a receive port.
• the circuit further comprises a first signal path between the common port of the first duplexer of the first frequency band and the first port of the diplexer.
• the RF circuit comprises a second signal path between the common port of the first duplexer, the second frequency band and the second port of the diplexer. Furthermore, the circuit comprises a phase shifter which is arranged in the second signal path. The phase shifter is intended to provide the impedances of the first duplexer of the second frequency band and the diplexer for at least one harmonic of one of the Adapting frequency bands so that at least one intermodulation product is reduced.
• the impedance matching relates in particular to the
• the harmonic can in particular the second or third harmonic of transmission frequencies, z. B. the first frequency band.
• the improved signal separation of such an RF circuit is thus due to the reduction of the intermodulation products. It has been recognized that in conventional RF circuits of front-end circuits, the isolation of a used diplexer can be so poor that undesired RF signals entering a signal path can cause intermodulation products due to nonlinear effects in a duplexer connected downstream of the diplexer. Their frequencies are in the passband of the duplexer. Such unwanted RF signals can then not be eliminated by conventional RF filters, since their frequencies the
• This RF circuit is compatible with common circuit topologies of front-end circuits, whereby the entge ⁇ gensteht tively large gain in signal quality a ver ⁇ tively little additional circuitry. It is possible that the diplexer is a ceramic diplexer.
• Such a ceramic diplexer can be a base body made of an insulating material, for.
• Ceramics include. Recesses whose inner surfaces are covered by a metallization may be provided in the base body.
• Such a diplexer typically already has a very high linearity.
• the first frequency band, the 2 gigahertz band and the second frequency band is the 1 gigahertz band.
• the first frequency band then essentially comprises the Fre ⁇ frequencies between 1 GHz and 2 GHz, in particular from 1.4 to 2.2 GHz.
• the second frequency band then includes in
• first frequency band and the second frequency band from the three frequency ranges: low band (LB, about 650 to 1000 MHz), middle band (mid band, MB, 1700 - 2200 MHz) and high band ( High band, HB, frequencies f are substantially> 2500 MHz) are selected.
• low band about 650 to 1000 MHz
• middle band mid band, MB, 1700 - 2200 MHz
• high band High band, HB, frequencies f are substantially> 2500 MHz
• the mobile frequency bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 19, 20, 21, 26 or 28 can -.
• B. for carrier aggregation at transmission frequencies - come as a first frequency band or as a second frequency band in question.
• the mobile bands 1, 2, 3, 4, 21 are assigned to the MB and the frequency band 7 is assigned to the HB. So z.
• the following frequency band pairs may be used together: LB and LB: 5 and 12, 5 and 17;
• LB and MB 3 and 5, 1 and 5, 3 and 20, 1 and 19, 3 and 8, 4 and 12, 4 and 17, 3 and 26, 3 and 19, 19 and 21;
• MB and MB 1 and 21, 2 and 4;
• MB and HB 1 and 7, 3 and 7, 4 and 7;
• LB and HB 7 and 20, 7 and 28, 5 and 7.
• the RF circuit further comprises a second or more further duplexers of the first frequency band.
• Duplexers of the first frequency band are parallel to the first duplexer of the first frequency band on the one hand and connected to the first signal path on the other hand. Then a transmission mode - whether simultaneously or consecutively - via different duplexers of the first frequency band is possible.
• the HF circuit can also include a switch arrangement via which the first port of the diplexer can be connected to the second or several further duplexers of the first frequency band. The switch arrangement can be used to individually set which of the duplexers is to be connected to the diplexer. It is mög ⁇ Lich, that at any time always exactly one duplexer with the di- plexer is interconnected.
• the HF circuit comprises a second or a plurality of further duplexers of the second frequency band.
• the second or further duplexer of the second frequency band can be connected in parallel with the first duplexer of the second frequency band on the one hand and with the second signal path on the other hand.
• the HF circuit further comprises a further switch arrangement via which the second port of the diplexer can be connected to one or more of the duplexers of the second frequency band.
• the number of duplexers of the second frequency band, which are connected to the diplexer can thus also be set individually.
• phase shifter is tunable.
• a tunable phase shifter can in particular a
• Phase shifter be understood whose characteristic frequencies and / or the phase offset for relevant
• phase shifter is provided in the second signal path per duplexer of the second frequency band.
• the HF circuit comprises several phase shifters, these can be selected as desired from the alternatives mentioned above be. However, it is also possible that several or all phase shifters are of the same type.
• the phase shifter can reflect an unwanted signal from the diplexer to the diplexer. Desirable ⁇ Sig nal in the corresponding frequency range can pass through the diplexer without significant performance loss.
• a phase shifter may be a tunable phase shifter in which the degree of phase shift of a signal at a particular frequency is adjustable.
• the phase offset caused by the phase shifter preferably varies linearly with the frequency of the phase shift
• phase shifter designed as a phase shifter can in particular be an all-pass filter made of inductors and
• the RF circuit in a mobile device eg. B. in a front-end circuit of the mobile device is connected.
• a mobile device whose front-end circuit comprises such an HF circuit provides the user with an increased data rate while at the same time not degrading signal quality.
• the number of duplexers per first or second frequency band is not limited. Both the first and second frequency bands can independently have 1, 2, 3, 4 or more duplexers.
• the first frequency band can have 1, 2, 3, 4, 5 or more duplexers.
• the second frequency band can also have 1, 2, 3, 4, 5 or more duplexers.
• FIG. 1 shows the basic structure of an HF circuit
• FIG. 2 shows an embodiment with several duplexers of the first frequency band
• FIG. 3 shows an embodiment with several duplexers of the second frequency band
• Figure 4 shows an embodiment with a tunable
• FIG. 5 shows an embodiment with a plurality of duplexers of the first frequency band and a plurality of duplexers of the two ⁇ th frequency bands
• FIG. 8 shows the effect of a phase shifter within an RF circuit on the basis of different curves, which each represent a measure of an intermodulation product, at different values of the phase offset.
• Figure 9 shows the effect of a phase shifter within a
• Improved diplexer RF circuit based on different curves, each representing a measure of an intermodulation product, at different values of phase offset,
• FIG. 1 shows a simple embodiment of an HF circuit HF-S with a first duplexer of a first frequency band DU-HB-1, a first duplexer of a second frequency band DU-LB-1 and a diplexer DI.
• the first duplexer of the second frequency band DU-LB-1 connects a second Sig ⁇ nalpfad SP2 with the second port P2 of the diplexer DI.
• a phase shifter PS is connected in the second signal path SP2 a phase shifter PS is connected.
• the common port PG of the first duplexer of the first frequency band DU-HB-1 connects a first signal path SP1 to the first port PI of the diplexer DI.
• the common port PG of the diplexer DI can be connected to an antenna of a communication ⁇ device.
• Each of the two duplexers has a transmit port TX and a receive port RX.
• the two duplexer can be 29al ⁇ tet with one or more transceiver circuits of a mobile device via the transmit and receive ports.
• Critical in the operation of a conventional RF circuit is the following situation: via both transmit port TX both duplexer, a transmission signal is injected, which enters via the signal paths ⁇ SP1 and SP2 to the diplexer. Due to the final isolation of the diplexer loan DI part of Sendesig ⁇ Nals from the first frequency band in the second signal path SP2 in the direction of the duplexer of the second frequency band is coupled to a ⁇ .
• RX receive frequency band
• Phase shifter in its phase shifted that one
• FIG. 2 shows an embodiment in which three duplexers DU-HB-1, DU-HB-2, DU-HB-3 are provided for the first frequency band are.
• each of the duplexers can be coupled to the first signal path SP1.
• FIG. 3 shows an embodiment of an HF circuit HF-S in which three duplexers DU-LB-1, DU-LB-2, DU-LB-3 of the second frequency band are provided.
• each of the three duplexers can be individually coupled to the second signal path SP2. It can have a specially assigned to it phase shifter PS per ⁇ of the three duplexer.
• the switches are preferably connected between the phase shifters and the diplexer.
• Phase shifter a single phase shifter in the second
• Signal path SP2 can be interconnected.
• This phase shifter PS is intended and suitable for
• FIG. 5 shows an embodiment in which three duplexers are provided both in the first frequency band and in the second frequency band.
• FIG. 6 shows characteristic curves of a typical diplexer with relatively little insulation.
• FIG. 7 shows characteristic curves of a typical diplexer with higher insulation.
• FIG. 8 shows the strength of the intermodulation interference in a carrier aggregation of the two Tx bands B5 and B7 when the diplexer of FIG. 6 is used.
• the RF circuit includes a phase shifter
• phase offset is adjustable.
• an intermodulation interference reduced by up to about 30 dB can be obtained.
• Figure 9 shows various isolation values of an RF circuit which includes the "better" diplexer of Figure 7 with increased isolation - besides a tunable phase shifter as phase shifter -
• the different curves shown in Figure 8 represent the isolation values with varied phase offset by the phase shifter Analogously to FIG. 7, the reduction of intermodulation
• Disturbances can be improved by choosing an appropriate phase offset of up to 30 dB.
• FIGS. 6 to 9 show that RF circuits clearly benefit from the new circuit topology, both with poorer and better diplexers.
• FIG. 10 shows the intensity of intermodulation products for HF circuits, each with one of the two diplexers shown in FIG. 6 and a phase shifter designed as a phase shifter. It turns out that the improved
• the RF circuit is not limited to the described or shown embodiments.
• An RF circuit may in particular contain other circuit components, signal paths, filters, switches.
• DU-HB-1 first duplexer of the first frequency band
• DU-HB-2 second duplexer of the first frequency band
• DU-HB-3 third duplexer of the first frequency band
• DU-LB-1 first duplexer of the second frequency band
• DU-LB-2 second duplexer of the second frequency band

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Transceivers (AREA)

Priority Applications (6)

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Citations (3)

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• 2015
  • 2015-05-11 DE DE102015107305.6A patent/DE102015107305B4/de active Active
• 2016
  • 2016-04-21 US US15/564,675 patent/US10530415B2/en active Active
  • 2016-04-21 WO PCT/EP2016/058917 patent/WO2016180613A1/de not_active Ceased
  • 2016-04-21 KR KR1020247006334A patent/KR20240032160A/ko not_active Ceased
  • 2016-04-21 EP EP16721374.3A patent/EP3295570B1/de active Active
  • 2016-04-21 CN CN201680022029.7A patent/CN107534451B/zh active Active
  • 2016-04-21 JP JP2017558734A patent/JP6833719B2/ja not_active Expired - Fee Related
  • 2016-04-21 KR KR1020177030083A patent/KR20180004118A/ko not_active Ceased

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