High oversampling ratio dynamic element matching scheme for high dynamic range digital to RF data conversion for radio communication systems

An RF transmitter module for a cellular radio, said transmitter module comprising:

• a delta-sigma modulator including a plurality of interleaving dynamic element matching (DEM) circuits providing interleaved digital bits at a reduced clock rate;
• an interleaver controller for controlling the DEM circuits so as to provide groups of the digital bits at different points in time;
• a summation junction adding the groups of the digital bits to provide a continuous stream of the interleaved digital bits;
• a digital-to-analog converter (DAC) for converting the stream of interleaved digital bits to an analog signal;
• a tunable bandpass filter for removing out-of-band signals from the analog signal;
• and
• a power amplifier for amplifying the analog signal.

An RF transmitter module for a cellular radio, said transmitter module comprising:

• a delta-sigma modulator including a plurality of interleaving dynamic element matching (DEM) circuits providing interleaved digital bits at a reduced clock rate;
• an interleaver controller for controlling the DEM circuits so as to provide groups of the digital bits at different points in time;
• a plurality of digital-to-analog converters (DACs) each receiving the group of the digital bits from a separate one of the DEM circuits, each DAC converting the group of interleaved digital bits to an analog signal;
• a summation junction adding the analog signal from each of the DACs to provide a combined analog signal;
• a tunable bandpass filter for removing out-of-band signals from the combined analog signal;
• and
• a power amplifier for amplifying the combined analog signal.

An RF transmitter module for a cellular radio, said transmitter module comprising:

• a delta-sigma modulator including a plurality of interleaving dynamic element matching (DEM) circuits providing interleaved digital bits at a reduced clock rate;
• an interleaver controller for controlling the DEM circuits so as to provide groups of the digital bits at different points in time;
• a plurality of digital-to-analog converters (DACs) each receiving the group of the digital bits from a separate one of the DEM circuits, each DAC converting the group of interleaved digital bits to an analog signal;
• at least one tunable bandpass filter for removing out-of-band signals from the analog signal;
• a plurality of power amplifiers each receiving and amplifying the analog signal from a separate one of the DACs;
• and
• a summation junction adding the analog signals from each of the power amplifiers.