A 12-Bit 0.5-2.4-GHz 0.65°-Peak-INL Parasitic-Insensitive Digital-to-Phase Converter

A 12-bit 0.5–2.4-GHz parasitic-insensitive digital-to-phase converter (DPC) with high linearity is presented in this letter. A modified parasitic-insensitive charge-based (PICB) phase interpolator (PI) is proposed to avoid linearity degradation caused by parasitic effect. A novel PI cell with separated clock selecting logic is implemented to solve charge leakage and overcharging problem. The DPC is designed and fabricated in 40-nm CMOS technology, which occupies a chip area of 0.04 mm2 and consumes 18.3 mW from a 1.3-V supply voltage. Operating in a frequency range from 0.5 to 2.4 GHz, the DPC demonstrates a peak integral nonlinearity (INL) of 0.65° and a peak differential nonlinearity (DNL) of 0.25°.