Patent ID: 8019290
Filing Date: 2011-09-13
Classification: H03D,H03H,H04B

Abstract:
1. A reconfigurable transmitter capable of operating in a direct-up mode or a two-step-up mode, wherein in the direct-up mode the intermediate frequency IF=0, the transmitter comprising: a baseband to intermediate frequency upconverter to perform baseband to intermediate frequency upconversion of a signal to either a positive IF or negative IF in the two-step-up mode, the upconverter being-bypassed in the direct-up mode; an intermediate frequency to radio frequency upconverter and a local oscillator to perform intermediate frequency to radio frequency upconversion; and a frequency synthesizer having a step size larger than one channel spacing; and a triple-mode channel-selection filter (CSF) with the center frequency reconfigurable between negative IF, zero IF, and positive IF; wherein the IF is set to 0.5 CS, where CS represents a channel spacing.