Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-05-16
2006-05-16
Urban, Edward F. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S315000, C455S114200, C455S296000, C455S255000
Reexamination Certificate
active
07046980
ABSTRACT:
This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters and receivers. To solve this problem a virtual LO™ signal is generated which emulates mixing with a local oscillator (LO) signal. However, the virtual local oscillator (VLO) signal is constructed using signals that do not contain a significant amount of power (or no power at all) at the wanted output RF frequency, so there is no LO component to leak to the output. The invention also does not require sophisticated filters or large capacitors as other designs in the art, so it is fully integratable.
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Manku Tajinder
Snyder Chris
Weale Gareth
Wong Lawrence
Jackson Blane J.
SiRiFIC Wireless Corporation
Townsend and Townsend / and Crew LLP
Urban Edward F.
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