| 摘要 |
<p>In this delta-sigma modulator, one or more (41, 42) of a plurality of integrators (41 to 45) use variable-gain differential amplifiers (46, 47) with variable open-loop gain and the remaining integrators (43 to 45) use fixed-gain differential amplifiers (48 to 50) with fixed open-loop gain. This delta-sigma modulator is provided with open-loop-gain control means (62 and 63) that determine whether or not resonance is occurring, and if resonance is determined to be occurring, control the variable-gain differential amplifier(s) (46 and 47) so as to decrease the open-loop gain(s) thereof.</p> |
