公开(公告)号：EP1766782B1

公开(公告)日：2008-11-19

申请号：EP05737428.2

申请日：2005-04-14

申请人： Analog Devices, Inc.

发明人： NGUYEN, Khiem ,  ADAMS, Robert, W.

IPC分类号： H03M3/00

CPC分类号： H03M3/386 ,  H03J1/0091 ,  H03J2200/10 ,  H03M3/458

摘要： A hybrid tuning circuit is used consisting of a digital finite state machine and an analog tuning circuit to effectively keep the RC product of the continuous time integrator constant across process, temperature, supply, and sampling rate variations. Since the implementation is continuous, the tracking is more accurate than traditional techniques. Using a carefully chosen clocking scheme, the technique gets rid of inter-symbol interference in the feedback DAC. The technique does not use a reference frequency, thereby eliminating the need for a user to identify a reference frequency.

公开(公告)号：EP1966894B1

公开(公告)日：2010-02-10

申请号：EP06848190.2

申请日：2006-12-27

申请人： Analog Devices, Inc.

发明人： BAGINSKI, Paul A. ,  ADAMS, Robert ,  NGUYEN, Khiem

IPC分类号： H03H19/00 ,  H03M3/00 ,  H03M7/00

CPC分类号： H03M3/502 ,  H03H19/004

公开(公告)号：EP1966894A2

公开(公告)日：2008-09-10

申请号：EP06848190.2

申请日：2006-12-27

申请人： Analog Devices, Inc.

发明人： BAGINSKI, Paul A. ,  ADAMS, Robert ,  NGUYEN, Khiem

IPC分类号： H03M3/00 ,  H03H17/02 ,  H03H17/06

CPC分类号： H03M3/502 ,  H03H19/004

摘要： A digital to analog converter (DAC) includes a first continuous-time stage that receives an input signal associated with a digital signal and performs continuous-time digital-to-analog conversion operations on the input signal. The first continuous-time stage outputs a first output signal. A second switched-capacitor stage receives the first output signal and performs switched-capacitor filtering of the first output signal. The second switched-capacitor stage outputs a second output signal that is sent to a low pass filter to form a continuous analog signal associated with the digital signal.

公开(公告)号：EP1766782A1

公开(公告)日：2007-03-28

申请号：EP05737428.2

申请日：2005-04-14

申请人： Analog Devices, Inc.

发明人： NGUYEN, Khiem ,  ADAMS, Robert, W.

IPC分类号： H03M3/00

CPC分类号： H03M3/386 ,  H03J1/0091 ,  H03J2200/10 ,  H03M3/458

摘要： A hybrid tuning circuit is used consisting of a digital finite state machine and an analog tuning circuit to effectively keep the RC product of the continuous time integrator constant across process, temperature, supply, and sampling rate variations. Since the implementation is continuous, the tracking is more accurate than traditional techniques. Using a carefully chosen clocking scheme, the technique gets rid of inter-symbol interference in the feedback DAC. The technique does not use a reference frequency, thereby eliminating the need for a user to identify a reference frequency.