| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ΔΣ modulator that keeps power consumption and circuit scale nonincreasing. <P>SOLUTION: The ΔΣ modulator includes: a plurality of integrators INT11-INT14 cascaded to an input of an analog signal; a quantizer Quan11 for quantizing an output signal of the integrator INT11 to output a digital signal; a feedback DA converter DAC11 for converting the digital signal from the quantizer to an analog signal to be supplied to an input side of at least the initial stage integrator INT14; and an adder ADD11 disposed on an input stage side of the final stage integrator to add an output of the preceding stage integrator and at least one path signal supplied from at least another path via at least one first resistance having a first coefficient. The final stage integrator includes an integral capacity and a second resistance having a second coefficient. The coefficient of each degree of an open loop transfer function is determined by the first coefficient of the first resistance and the second coefficient of the second resistance. <P>COPYRIGHT: (C)2012,JPO&INPIT |
