Patent ID: 6956514

Claim:
A delta-sigma modulator comprising: a quantizer; a loop-filter coupled to an input of the quantizer and receiving first and second feedback bits in response to an output of the quantizer, the loop-filter comprising: first and second capacitors each having an input plate and an output plate, the output plate of each of the first and second capacitors connected to a charge summing node with a fixed connection; first switching circuitry for coupling in an order selected by the first feedback bit one of first and second voltages to the input plate of the first capacitor during a charging phase and another of the first and second voltages to the input plate of the first capacitor during a charge transfer phase; and second switching circuitry for coupling in another order selected by the second feedback bit one of the first and second voltages to the input plate of the second capacitor during the charging phase and another of the first and second voltages to the input plate of the second capacitor during the charge transfer phase.