公开(公告)号：US20210105016A1

公开(公告)日：2021-04-08

申请号：US17082467

申请日：2020-10-28

Applicant: Rambus Inc.

Inventor： Marcus VAN IERSSEL ,  Dominic DICLEMENTE

IPC: H03M1/06 ,  H03M7/16

Abstract: A phase rotator receives control signals and thermometer coded signals that specifies the phase of an output signal. The phase rotator may be used, for example, by a clock and data recovery (CDR) circuit to continually rotate the phase of a clock to compensate for phase/frequency mismatches between received data and the clock. The control signals determine the phase quadrant (i.e., 0°-90°, 90°-180°, etc.) of the output signal. The thermometer coded signals determine the phase of the output signal within a quadrant by steering a set of bias currents between two or more nodes. The set of bias currents are selected to reduce the non-linearity between the thermometer coded value and the phase of the output signal.

公开(公告)号：US20200007137A1

公开(公告)日：2020-01-02

申请号：US16441742

申请日：2019-06-14

Applicant: Rambus Inc.

Inventor： Marcus VAN IERSSEL ,  Dominic DICLEMENTE

IPC: H03M1/06 ,  H03M7/16

Abstract: A phase rotator receives control signals and thermometer coded signals that specifies the phase of an output signal. The phase rotator may be used, for example, by a clock and data recovery (CDR) circuit to continually rotate the phase of a clock to compensate for phase/frequency mismatches between received data and the clock. The control signals determine the phase quadrant (i.e., 0°-90°, 90°-180°, etc.) of the output signal. The thermometer coded signals determine the phase of the output signal within a quadrant by steering a set of bias currents between two or more nodes. The set of bias currents are selected to reduce the non-linearity between the thermometer coded value and the phase of the output signal.