Based on a 180 nm CMOS process, a sigma-delta continuous-time modulator with reconfigurable feedforward third-order operation was designed for audio applications. The traditional sigma-delta continuous time modulator has only one operating mode, but the proposed modulator with the reconfigurable integrator has two operating modes: high-resolution and low-power consumption modes. In addition, summation ahead is used to reduce the power consumption of the modulator, negative-R compensation is used to improve the SNDR of the modulator, and excess loop delay compensation is used to improve the stability of the modulator. With a signal bandwidth of 20 kHz and supply voltage of 1.8 V, the modulator has an SNDR of 94.7 dB and power consumption of 291 μW in the low-power consumption mode and an SNDR of 108 dB and power consumption of 436.6 μW in the high-resolution mode.