Patent ID: 7561635

Claim:
A dynamically adjustable noise shaping coder apparatus for use in a radio frequency (RF) transmitter, comprising: a first delta-sigma modulator having at least one programmable coefficient and at least one dither apparatus associated therewith, said first modulator being adapted to operate according to a first order; a second delta-sigma modulator having at least one programmable coefficient and at least one dither apparatus associated therewith, said second modulator being adapted to operate according to a second order; a third delta-sigma modulator having at least one programmable coefficient and at least one dither apparatus associated therewith, said third modulator being adapted to operate according to a third order; and a multiplexer coupled to an output of each of said first, second and third modulators; where said coder apparatus selectively varies, during operation, at least one of: (i) which of said first, second and third modulators is used; (ii) a value of said at least one programmable coefficient associated with at least one of said first, second and third modulators; and (iii) a dither level applied by said dither apparatus associated with at least one of said first, second and third modulators.