a modulator was designed with 1.8V supply voltage

1.8mW power consumption

16bit precision and figure of merit (FOM) up to 170.Its oversampling rate is 128

using 3 -order noise reshaping.The feedforward structure and one bit quantization were used to reduce power consumption.The PMOSFET was used to achieve local feedback

and improved the performance effectively.The design of the whole circuit and layout was implemented on SMIC 0.18μm process after analyzed the system structure and the submodules such as operational amplifier

comparator and so on.On ss corner

the simulation results show a good performance

the modulator achieved 100. 8dB signal to noise ratio (SNR) in 20kHz bandwidth

and reduced effective bits achieved 16 bits requirement.