Patent ID: 7133644
Filing Date: 2006-11-07
Classification: H03F,H04B

Abstract:
1. A digital baseband (DBB) transmitter comprising: (a) an analog radio transmitter including a temperature sensor; (b) a plurality of digital compensation modules; (c) a memory for storing a plurality of look up tables (LUTs); and (d) at least one controller in communication with the analog radio transmitter and each of the digital compensation modules, wherein the digital compensation modules correct radio frequency (RF) parameter deficiencies that occur in the analog radio transmitter, the temperature sensor monitors a temperature reading associated with the analog radio transmitter, and a particular one of the LUTs is selected from the memory to set up parameters for at least one of the digital compensation modules in response to the temperature reading monitored by the temperature sensor, and the digital compensation modules include a digital direct current (DC) offset compensation module having two signal inputs including an in-phase (I) signal component and a quadrature (Q) signal component, the analog radio transmitter includes a modulator prone to a carrier leakage deficiency, a minimum detected power reading associated with each of the signal inputs is determined, first and second DC offset compensation values are determined by interpolating the minimum detected power readings, and the digital DC offset compensation module is configured to eliminate carrier leakage associated with the modulator by adjusting the respective DC levels of the two signal inputs based on the first and second DC offset compensation values.