A 3.2-GHz Supply Noise-Insensitive PLL Using a Gate-Voltage-Boosted Source-Follower Regulator and Residual Noise Cancellation

In this brief, we propose a supply noise-insensitive charge-pump phase-locked loop (PLL) using a source-follower (SF) regulator and noise cancellation. In order to minimize the voltage drop of the SF regulator while improving supply rejection, a gate-voltage-boosting technique and the body-controlled noise cancellation are proposed. To suppress the phase noise from the ring oscillator, a reference multiplier is employed to maximize the PLL loop bandwidth. Implemented in 65-nm CMOS, a prototype PLL at 3.2 GHz achieves supply noise spur of less than −33 dBc for a 50-
$\text{m}V_{\mathrm{ pp}}$
supply noise around the loop bandwidth while consuming 3.12 mW from a 1-V supply.