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1. (WO2009130207) PASSIVE MIXER AND FOUR-PHASE CLOCKING METHOD AND APPARATUS

Pub. No.:    WO/2009/130207    International Application No.:    PCT/EP2009/054723
Publication Date: Oct 29, 2009 International Filing Date: Apr 21, 2009
IPC: H03D 7/14
H03D 7/16
Applicants: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
MU, Fenghao
TILLMAN, Fredrik
Inventors: MU, Fenghao
TILLMAN, Fredrik
Title: PASSIVE MIXER AND FOUR-PHASE CLOCKING METHOD AND APPARATUS
Abstract:
According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer includes a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a first set of clock signals and a second set of clock signals. The first set of clock signals has a frequency twice that of the second set of clock signals. The first set of clock signals is arranged to drive the mixer input switch transistors and the second set of clock signals is arranged to drive the output switch transistors.