Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2005-12-06
2005-12-06
Vo, Nguyen T. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S315000, C455S318000, C455S324000, C375S346000
Reexamination Certificate
active
06973297
ABSTRACT:
This patent describes a method of removing the LO-leakage and 1/f noise problems associated with direct conversion RF receivers and other demodulators. In order to solve this problem a virtual LO™ signal is generated within the RF signal path which is tuned to the incoming RF signal. 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 LO frequency. Any errors in generating the virtual LO signal are minimized using a closed loop correction scheme.
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Ling Yang
Manku Tajinder
Wong Lawrence
Jackson Blane J.
Sirific Wireless Corporation
Townsend and Townsend / and Crew LLP
Vo Nguyen T.
LandOfFree
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