公开(公告)号：EP2798415A2

公开(公告)日：2014-11-05

申请号：EP12813377.4

申请日：2012-12-27

申请人： ST-Ericsson SA

发明人： HELIÖ, Petri ,  KORPI, Petri ,  VÄÄNÄNEN, Paavo

IPC分类号： G04F10/00

CPC分类号： G04F10/005

摘要： A calibration method disclosed herein calibrates at least one of a capacitive load and a charging current controlling a charge-to-digital timer (CDT). In general, the disclosed calibration method measures multiple calibration phases based on start and stop signals separated by a known time difference, and therefore having a known phase, and adjusts at least one of the capacitive load and the charging current of the CDT based on the measured calibration phases. In so doing, the disclosed calibration method reduces power dissipation and peak supply currents over the frequency range of the CDT.

公开(公告)号：EP2798416A2

公开(公告)日：2014-11-05

申请号：EP12832717.8

申请日：2012-12-28

申请人： ST-Ericsson SA

发明人： HELIÖ, Petri ,  FRAMBACH, Johannes Petrus Antonius ,  KORPI, Petri ,  VÄÄNÄNEN, Paavo

IPC分类号： G04F10/00 ,  H03M1/56

CPC分类号： H03M1/12 ,  G04F10/005 ,  G04F10/105 ,  H03M1/1009 ,  H03M1/1023 ,  H03M1/50

摘要： A resistive/residual Charge to Digital Timer (RCDT) provides efficient, accurate measurement of short time delay between two signals, by converting the time delay to current, and measuring the charge integrated by a capacitor over a duration. In one embodiment, in quantizing this charge (measured as voltage), a residual charge is maintained cycle-to-cycle. This allows for implementation of a Noise shaping Charge to Digital Timer (NCDT), providing improved resolution over a plurality of measurement cycles. The RCDT/NCDT is particularly (but not exclusively) well suited for phase error detection in a Digital Phase Locked Loop.