Patent ID: 8433277

Claim:
A radio frequency receiver, comprising: a quadrature mixer configured to convert radio frequency signals to baseband signals or intermediate frequency signals, the quadrature mixer comprising an in-phase passive mixer and a quadrature-phase passive mixer, wherein each of the passive mixers 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 configured to generate a plurality of quadrature pulsed clock signals and delayed versions of the quadrature pulsed clock signals; one or more capacitors arranged to capacitively couple at least one of the quadrature pulsed clock signals and the delayed versions of the quadrature pulsed clock signals to the passive mixers; and bias circuitry configured to adjust a conducting time slot of the passive mixers; wherein the quadrature pulsed clock signals and the delayed versions of the quadrature pulsed clock signals are arranged to drive the mixer input switch transistors and the output switch transistors.