Full-duplex transceiver with distributed duplexing function

A technology of transceivers and radio transceivers, applied in the direction of transmission systems, electrical components, etc., can solve the problems of unresolved Tx signals, excessive noise, leakage, etc.

Inactive Publication Date: 2003-04-09
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention does not describe the stop-band performance and noise characteristics of SAW-based duplexers in any specific or quantitative way
In particular, it does not address the leakage of Tx signal and excess noise into the Rx link, which are likely to arise due to the inferiority of SAW-based duplexers relative to full-performance duplexers

Method used

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  • Full-duplex transceiver with distributed duplexing function
  • Full-duplex transceiver with distributed duplexing function
  • Full-duplex transceiver with distributed duplexing function

Examples

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Embodiment Construction

[0043] now refer to figure 2 , figure 2is a block diagram schematically illustrating a wireless transceiver 50 according to a preferred embodiment of the present invention. Transceiver 50 includes Tx link 46 and Rx link 48 , which are coupled to antenna 32 via duplex circuit 49 . As will be described below, the Tx and Rx links and duplexing circuitry 49 are substantially different from their counterparts in transceiver 20 (FIG. 1), so that transceiver 50 can match or outperform prior art transceivers. Its performance, while existing technology transceivers are larger in size and more expensive to manufacture.

[0044] In this example, the transceiver 50 is designed to operate in the NMT450 cellular frequency band (Tx; 450-455MHz, Rx: 460-465MHz), but it can be easily adapted to operate in other cellular frequency bands or in essentially any other work on radio frequency bands. For brevity, certain standard parts of the transceiver, such as isolators in the Tx link, are cha...

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PUM

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Abstract

A duplex radio transceiver, coupled to baseband circuitry and to an antenna, includes a receive chain, a transmit chain and a duplexer. The transmit chain includes filter components that attenuate signals originating from the transmit chain in a receive frequency band by a stop-band attenuation that is approximately equal to or greater than the stop-band attenuation of the duplexer in the receive band. Similarly, the receive chain includes filter components that attenuate signals in a transmit frequency band by a stop-band attenuation that is approximately equal to or greater than the stop-band attenuation of the duplexer in the transmit band. A bias control circuit senses a power level associated with radio signals in the transmit chain and adjusts an amplifier in the receive chain responsive to the power level.

Description

technical field [0001] The present invention relates generally to wireless communication devices, and more particularly to mobile wireless transceivers. Background technique [0002] Small full-duplex wireless transceivers are used in many mobile communication devices, such as cellular telephones. Such a transceiver typically includes a transmit (TX) link and a receive (Rx) link, sharing a common antenna. To maintain optimum performance of the receive chain even when transmitting at maximum output power, the transceiver must be carefully designed. Care must be taken to avoid leakage of the Tx signal into the Rx chain, which would cause Rx saturation, and to avoid leakage of broadband noise from the Tx chain, especially in the Rx band, which tends to degrade the receiver sensitivity. The latter requirement is especially important and difficult to achieve when the Tx and Rx bands are closely spaced, as is the case in cellular telephony. [0003] Figure 1 schematically illus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/50H04B1/52H04B1/56
CPCH04B1/56H04B1/525H04B1/52
Inventor H·韦斯曼E·约那
Owner QUALCOMM INC
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