Patent ID: 7394862
Filing Date: 2008-07-01
Classification: H04L

Abstract:
1. A polar RF transmitter within a radio transceiver for modulating communication signals in different modes of operation, comprising: a digital processor operably coupled to receive an outgoing digital signal, a first control signal indicating a type of modulation and a second control signal indicating a signal bandwidth of the outgoing digital signal, the digital processor digitally modulating the outgoing digital signal to produce one of a constant envelope modulated digital signal and a variable envelope modulated digital signal based upon the first control signal, wherein the digital processor further includes: first and second Digital-to-Analog converters (DACs) for converting the filtered envelope signal and the filtered phase signal, respectively, from digital signals to analog signals to produce an analog envelope signal and an analog phase signal; first and second low pass filters for filtering the analog envelope signal and the analog phase signal, respectively; a translational loop operably coupled to receive the analog phase signal to up-convert the analog phase signal from an IF signal to an RF signal, wherein the translational loop further includes: a power amplifier for producing a modulated RF signal based on the RF signal and the analog envelope signal.