MODULAR CIRCUIT ARRANGEMENT USED FOR ATTENUATION COMPENSATION

• US 20100291915A1
• Filed: 01/26/2008
• Published: 11/18/2010
• Est. Priority Date: 01/26/2007
• Status: Active Grant

• Current Assignee: Molex CVS Dabendorf GmbH (Laird Limited)
• Original Assignee: Molex CVS Dabendorf GmbH (Laird Limited)
• Inventors: Heyder, Frank, Jacobi, Raimo, Nast, Helmut
• Granted Patent: US 8,380,136 B2
• Time in Patent Office: Days
• US Class Current: 455/422.1
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/3822 specially adapted for use in vehicles H04B1/3827 takes precedence
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

The invention relates to a multi-band, multi-part circuit arrangement for compensating the attenuation of HF wireless signals in the signal paths between a transmitting and receiving device and an external antenna. The circuit arrangement comprises power amplifiers, receiving amplifiers, at least one splitter, at least one combiner, duplexers and frequency and/or band filters, HF switching means as well as a detector circuit for the detection of transmission signals from the transmitting and receiving device and for providing control signals for the HF switching means. It consists of a universal front-end module with HF switching means disposed on the antenna side for switching the signal paths on the antenna side, a broadband receiving amplifier and at least one splitter dividing the output signal of the receiving amplifier to several outputs of the front-end module, as well as a universal back-end module with HF switching means which is disposed on the device side and which is coupled with the transmitting and receiving device via the detector circuit for switching the signal paths on the device side, at least one receiving amplifier and at least one combiner, bringing together the input signals of several inputs of the back-end module. The front-end and the back-end modules can be combined and wired differently with various power amplifiers and different frequency and/or band filters.

Claims

1. A multi-band circuit arrangement for compensation of the attenuation occurring in signal paths between a transmitting and receiving device for wireless communication and an external antenna separately disposed from the transmitting and receiving device and utilized with this transmitting and receiving device, having several transmitting branches and receiving branches on the antenna side and device side and at least consisting of power amplifiers, receiving amplifiers, HF switching means at least one splitter, at least one combining element, a detector circuit for the detection of transmission signals of the transmitting and receiving device and for controlling the HF switching means as well as duplexers and frequency and/or band-pass filters, whereby the above-named circuit components are wired up and interact with one another corresponding to the respective switching state of HF switching means, so that the transmitting and receiving device as well as the external antenna are connected with one another in a base state of the circuit arrangement via their receiving branches, whereas when a transmission signal is first detected from the transmitting and receiving device and for the subsequent duration of the presence of a speech or data connection to the transmitting and receiving device either simultaneously via a receiving branch and a transmitting branch brought together with the latter on the antenna side and on the device side, in each case at a duplexer, or when a transmission signal is present, they are joined together via a transmitting branch, and when a transmission signal is not present, via a receiving branch is hereby characterized in that the circuit arrangement is designed at least partially in a modular manner and consists of a universal front-end module with HF switching means disposed on the antenna side for switching the signal paths on the antenna side, a broadband receiving amplifier and the at least one splitter that divides the output signal of the receiving amplifier into several outputs of the front-end module as well as a universal back-end module with HF switching means which is disposed on the device side and which is coupled with the transmitting and receiving device via the detector circuit for switching the signal paths on the device side, at least one receiving amplifier and the at least one combining element bringing together the input signals of several inputs of the back-end module, wherein the front-end and the back-end modules are wired up externally with the other circuit components, namely the power amplifiers, the duplexers, the frequency and/or band-pass filters disposed between the splitter of the front-end module and the combining element of the back-end module as well as the detector unit, which are designed and dimensioned corresponding to the respective application objective of the circuit arrangement as well as the frequency band regions and wireless standards to be supported by this circuit.

2. The circuit arrangement according to claim 1, further characterized in that the band-pass filters disposed between the splitter of the front-end module and the combining element of the back-end module are assembled in a comb-filter module.

3. The circuit arrangement according to claim 1, further characterized in that at least several of the power amplifiers of the transmitting branches are assembled in an amplifier module.

4. The circuit arrangement according to claim 1, further characterized in that the detector circuit is constructed as a module with several detectors for detecting transmission signals of different frequency bands.

5. The circuit arrangement according to claim 1, further characterized in that the unused connections of the front-end and the back-end modules are grounded each time with a resistance.

6. The circuit arrangement according to claim 1, further characterized in that the arrangement can be configured for alternative operation with a mobile wireless device operating according to the GSM-900 standard, the GSM-1800 standard or the UMTS standard by a corresponding wiring of front-end module and back-end module.

7. The circuit arrangement according to claim 1, further characterized in that the arrangement can be configured for alternative operation with a mobile wireless device operating according to the US-GSM/CDMA-850 standard or the US-GSM/CDMA-1900 standard by a corresponding wiring of front-end module and back-end module.

8. The circuit arrangement according to claim 1, further characterized in that the arrangement can be configured for alternative operation with a transmitting and receiving device operating according to the GSM-900 standard or the US-GSM/CDMA-850 standard, the GSM-1800 standard or the US-GSM/CDMA-1900 standard, the UMTS standard, according to the WLAN standard or according to the WiMAX standard by a corresponding wiring of front-end module and back-end module.

9. The circuit arrangement according to claim 6, further characterized in that an isolator or circulator is connected on the load side to each power amplifier disposed in a transmitting branch for a CDMA transmitting signal.

10. The circuit arrangement according to claim 6, further characterized in that a harmonic filter is connected on the load side each time to the power amplifiers of the transmitting branches.

11. The circuit arrangement according to claim 6, further characterized in that an attenuation element is connected on the line side each time to the power amplifiers of the transmitting branches.

12. The circuit arrangement according to claim 1, further characterized in that a logic unit is disposed in each of front-end module and back-end module for actuating the HF switching means, which converts the control signals of detector circuit so that the HF switching means assume the switching state corresponding to the base state of the circuit or to a switching state corresponding to the recognized transmission signal in each case.

13. The circuit arrangement according to claim 1, further characterized in that two splitters and an additional HF switching means are disposed in parallel in the front-end module, and two combining elements and an additional HF switching means are disposed in parallel in the back-end module, whereby the additional HF switching means connected upstream to the splitters in the front-end module for branching between them, and the additional HF switching means connected downstream to the combining elements in the back-end module for alternating between their outputs are also actuated directly by the detector circuit or the logic units converting the optionally present control signals of the detector circuit, so that in the base state of the circuit arrangement, all receiving branches are conducted over the first splitter of front-end module, the first combining element of the back-end module and the frequency and/or band-pass filters disposed between them in the external wiring, but when a transmission signal is first detected, and for the duration of the presence of a speech or data connection to the transmitting and receiving device, only the transmitting branches of the non-duplex channels are conducted over the above-named circuit elements with the frequency and/or band-pass filters, whereas the receiving branches of the duplex channels are conducted via the second splitter of front-end module and from the outputs thereof, directly or only via additional attenuation elements, to the inputs of the second combining element in back-end module.

14. The circuit arrangement according to claim 1, further characterized in that several receiving amplifiers, namely one receiving amplifier per frequency band and/or transmission standard that can be used with the circuit arrangement are disposed in the back-end module, and these are integrated into the combining element or the combining elements.

15. The circuit arrangement according to 1, further characterized in that the power amplifiers disposed in transmitting branches are turned off completely or at least the HF is turned off when a transmission signal based on corresponding control signals of the detector circuit is absent.