Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2006-12-12
2009-10-06
Le, Nhan T (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S260000, C455S340000, C375S345000
Reexamination Certificate
active
07599675
ABSTRACT:
A frequency conversion receiver comprises a passive mixer, a Low-Noise Amplifier (LNA) and a balun. The low-noise amplifier generates an amplified single-ended signal responsive to a single-ended receiver input signal. The passive mixer generates a mixer output signal responsive to a differential mixer input signal and a four-phase local oscillator signal. The balun transforms the amplified singled-ended signal into the differential mixer input signal, the balun having a first winding coupled to an output of the low-noise amplifier and a second winding coupled to an input of the passive mixer, the second winding having more turns than the first winding. The turn ratio of the second winding to the first winding provides gain compensation to the low-noise amplifier, and in conjunction with the low-noise amplifier and the passive mixer, provides a desired gain to the receiver and linearity over a dynamic range of the receiver input signal.
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Mårtensson Andreas T.
Mu Fenghao
Nilsson Magnus
Coats & Bennett P.L.L.C.
Le Nhan T
Telefonaktiebolaget LM Ericsson (publ)
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