Passive mixer and four-phase clocking method and apparatus
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United States of America Patent
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Apr 30, 2013
Grant Date -
Oct 29, 2009
app pub date -
Apr 23, 2008
filing date -
Apr 23, 2008
priority date (Note) -
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Abstract
According to one embodiment, a radio frequency receiver comprises a quadrature mixer configured to convert radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer comprises an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer comprises 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 plurality of quadrature pulsed clock signals and delayed versions of the quadrature pulsed clock signals. The quadrature pulsed clock signals and the delayed versions of the quadrature pulsed clock signals drive the mixer input switch transistors and the output switch transistors.
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