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This paper presents a 3rd order single-bit CT ΔΣ modulator with active-RC integrators using negative-R assistant at virtual ground, which mitigates opamp's requirements including the thermal noise and linearity leading to a drastic power-saving. Fabricated in a 65nm CMOS process, the modulator occupies area of 0.27mm2. It achieves 100.5dB SFDR and 93.1dB DR in 20kHz BW, while consuming only 55μW from...