Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2008-07-22
2008-07-22
Le, Thanh Cong (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S323000, C455S455000, C455S333000
Reexamination Certificate
active
07403758
ABSTRACT:
Method and apparatus are provided for linearized balanced signal mixing. A signal mixing circuit (10) for translating a radio frequency (RF) signal is provided comprising an input amplifier (12), a mixer network (14), and an output buffer amplifier (18). The input amplifier (12) is configured to produce an amplified RF signal and cancel an input third-order intermodulation (IM3) distortion in the amplified RF signal with a cross-coupled feedback amplifier (13). The mixer network (14) is configured to produce an intermediate frequency (IF) signal based on the amplified RF signal and a local oscillator signal. The output amplifier (18) is configured to buffer the IF signal and cancel an output IM3distortion in the IF signal with a cross-coupled feedback amplifier (19). The input amplifier (12) and cross-coupled feedback amplifier (13) also serve as a bias current source for the mixer network (14), thus lowering the supply voltage required for the mixing circuit (10).
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Cong Le Thanh
Freescale Semicondutor, Inc.
Ingrassia Fisher & Lorenz P.C.
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