Sub-ranging digital to analog converter for radio frequency amplification.

摘要

An apparatus and method for amplifying a radio frequency signal using a main Digital to Analog Converter (RFDAC) (250) and a subordinate Digital to Analog Converter (Sub-DAC) (270). The main RFDAC provides (250) a first portion of a N-bit digital output, which specifies the amplification level of the radio frequency signal, and the sub-DAC (270) provides a second portion of the N-bit digital word. Together, the main RFDAC (250) and the Sub-DAC (270) convert a complete N-bit digital word, where N specifies the resolution of the output radio frequency signal.