Wave transmission lines and networks – Coupling networks – Delay lines including a lumped parameter
Reexamination Certificate
2007-01-16
2007-01-16
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Delay lines including a lumped parameter
C333S156000, C455S318000, C455S319000
Reexamination Certificate
active
10120938
ABSTRACT:
The present invention provides a phase shifting filter and a phase compensating direct downconversion receiver. A DC offset detector detects a DC offset in a received baseband signal and provides a feedback signal. A tunable filter phase shifts a local oscillator signal responsive to the feedback signal. The phase-shifted local oscillator signal is used to directly downconvert a received RF signal, whereby DC offset in the resulting baseband signal is reduced.
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A. Presser, “Varactor-Tunable, High-Q Microwave Filter,” RCA Review, vol. 42, Dec. 1981, pp
Toncich Stanley S.
Wallace Raymond Curtis
Kyocera Wireless Corp.
Lee Benny
LandOfFree
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