Patent ID: 7826549

Claim:
A radio frequency (RF) transmitter comprising: a first plurality of XOR gates and a first plurality of transistors, each XOR gate of the first plurality of XOR gates having a pair of inputs coupled to one bit of a first set data bits and a first clock, both corresponding to a I quadrature baseband signal component, and having a first output coupled to drive one of the first plurality of transistors; a second plurality of XOR gates and a second plurality of transistors, each XOR gate of the second plurality of XOR gates having a pair of inputs coupled to one bit of a second set of data bits and a second clock, both corresponding to a Q quadrature baseband signal component, and having a second output coupled to drive one of the second plurality of transistors, wherein each of a first subset of the first plurality of transistors and a first subset of the second plurality of transistors have an area that is proportional to a weight of the corresponding data bit of the I or Q quadrature baseband signal component, and wherein each of a second subset of the first plurality of transistors and a second subset of the second plurality of transistors have an equal area; the outputs of the first and second plurality of transistors being summed at a node to obtain a single-side band (SSB) RF output; and a controller to disable or enable the first subset of the first plurality of transistors and the first subset of the second plurality of transistors to obtain digital-to-analog conversion of the I and Q quadrature baseband signal components and to disable or enable the second subset of the first plurality of transistors and the second subset of the second plurality of transistors to correct a DC offset between the I and Q quadrature baseband signal components.