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Measurement of local oscillation leakage

a local oscillation leakage and measurement technology, applied in the direction of transmitter monitoring, electrical equipment, transmission monitoring, etc., can solve the problems of difficult to obtain an accurate measure of lo leakage, difficult to accurately compensate for lo leakage, and produced local oscillation leakag

Inactive Publication Date: 2006-03-30
AVAGO TECH WIRELESS IP SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables accurate measurement and compensation of local oscillation leakage, improving the accuracy of RF signal transmission by isolating and correcting for mismatches in RFICs.

Problems solved by technology

In practice, however, local oscillation leakage is produced because ideal matching of circuits and components thereof is not achievable.
An issue with local oscillation leakage compensation circuits is determining an appropriate setting.
This issue arises in most, if not all, direct conversion radios because such radios include other compensation circuitry to correct for DC offset, frequency offsets, et cetera.
When these other compensation circuits are active, they mask the LO leakage without compensating for it, thus making it difficult to obtain an accurate measure of LO leakage.
Without an accurate measure of LO leakage, accurate compensation thereof is difficult.

Method used

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  • Measurement of local oscillation leakage
  • Measurement of local oscillation leakage
  • Measurement of local oscillation leakage

Examples

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Embodiment Construction

[0021]FIG. 1 is a schematic block diagram illustrating a communication system 10 that includes a plurality of base stations and / or access points 12-16, a plurality of wireless communication devices 18-32 and a network hardware component 34. The wireless communication devices 18-32 may be laptop host computers 18 and 26, personal digital assistant hosts 20 and 30, personal computer hosts 24 and 32 and / or cellular telephone hosts 22 and 28. The details of the wireless communication devices will be described in greater detail with reference to FIG. 2.

[0022] The base stations or access points 12-16 are operably coupled to the network hardware 34 via local area network connections 36, 38 and 40. The network hardware 34, which may be a router, switch, bridge, modem, system controller, et cetera provides a wide area network connection 42 for the communication system 10. Each of the base stations or access points 12-16 has an associated antenna or antenna array to communicate with the wire...

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Abstract

The measuring of local oscillation leakage in radio frequency integrated circuits (RFICs) begins by concurrently enabling a transmitter portion and a receiver portion of a radio frequency integrated circuit. The processing then continues by providing a zero input to the transmitter portion such that information contained in the RF signals corresponds to local oscillation leakage produced by the transmitter portion. The processing continues by detecting the concurrent enablement of the transmitter and receiver portions. The processing continues by measuring, via the receiver portion, the received signal strength of the RF signals. The processing continues by processing the received signal strength over a pre-determined period of time commencing upon the detection of the concurrent enablement to obtain a measure of the local oscillation leakage.

Description

[0001] This patent application is claiming priority under 35 USC § 120 as a continuing patent application of co-pending patent application entitled MEASUREMENT OF LOCAL OSCILLATION LEAKAGE IN A RADIO FREQUENCY INTEGRATED CIRCUIT, having a filing date of Sep. 26, 2002, and a Ser. No. 10 / 255 / 258.BACKGROUND OF THE INVENTION [0002] 1. Technical Field of the Invention [0003] This invention relates generally to wireless communication systems and more particularly to radio frequency integrated circuits used within such wireless communication systems. [0004] 2. Description of Related Art [0005] Communication systems are known to support wireless and wire lined communications between wireless and / or wire lined communication devices. Such communication systems range from national and / or international cellular telephone systems to the Internet to point-to-point in-home wireless networks. Each type of communication system is constructed, and hence operates, in accordance with one or more commun...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B17/00H04B1/52
CPCH04B1/525H04B17/18H04B17/104
Inventor KIM, HEA JOUNG
Owner AVAGO TECH WIRELESS IP SINGAPORE PTE