Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-05-30
2006-05-30
Vuong, Quochien B. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S333000, C455S341000, C327S113000, C327S358000, C327S363000
Reexamination Certificate
active
07054609
ABSTRACT:
Method and system are disclosed for providing an improved linearity Gilbert mixer. The Gilbert mixer of the present invention includes a conventional mixer core coupled to a high linearity, multistage amplifier. The multistage amplifier includes two or more transistor stages connected together in a global feedback arrangement. The global feedback provides a greater loop gain for the amplifier than the local feedback arrangement, thereby increasing the linearity of the amplifier. In addition, having more than one transistor stage in the amplifier serves to increase the isolation of the RF input signal from the LO input signal. Furthermore, by providing parallel output stages in the multistage amplifier, several mixer cores may be driven from the same source while sharing the feedback mechanism.
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Mattisson Sven
Wiklund Magnus
Telefonaktiebolaget LM Ericsson (publ)
Vuong Quochien B.
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