Patent ID: 8854242

Claim:
A radio frequency digital to analog converter, comprising: a first capacitor arrangement comprising a plurality of switchable capacitor paths arranged in parallel, wherein each switchable capacitor path comprises a switchable element and a capacitor coupled in series; a first common node connected to the plurality of switchable capacitor paths of the first capacitor arrangement; and a first controller configured to receive a baseband signal having an in-phase component and a quadrature component, and to receive an LO (local oscillator) signal having an in-phase LO signal and a quadrature LO signal, wherein the first controller is configured to combine the in-phase component and the in-phase LO signal to obtain a first in-phase modulation signal, and to combine the quadrature component and the quadrature LO signal to obtain a first quadrature modulation signal, wherein the first controller is configured to control the plurality of switchable capacitor paths of the first capacitor arrangement in accordance with the first in-phase modulation signal or in accordance with the first quadrature modulation signal.