A High-Linearity and High-Resolution All-Digital Phase Modulator With Calibration Algorithm for LINC Transmitters

Linear amplification with nonlinear components (LINC) is an attractive technique to achieve linearity amplification with high efficiency. The linearity and resolution of the delay line play a great important role for the performance of LINC transmitters. In order to overcome the limitation of linearity and resolution, a delay-based all-digital phase modulator with calibration algorithm is proposed. This chip is implemented in 0.18 mu m CMOS technology. Measurement result proves that the proposed PM (Phase Modulator) has achieved 2.16ps resolution and the root mean square jitter of the delay is 11.8057ps (0.17 degrees).