Variable signal delaying circuit, quadrature frequency...

Details Variable signal delaying circuit, quadrature frequency... Variable signal delaying circuit, quadrature frequency...

2006-06-08

2009-10-20

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C455S260000, C455S323000, C455S180300

Reexamination Certificate

active

07606332

ABSTRACT:
A variable signal delaying circuit comprising an analog delay line having a control input for controlling the variable delay. A phase detector compares the input and output signals of the delaying circuit and supplies an output signal to a charge pump and integrator. A pulse stream generating arrangement produces pulse streams of different pulse widths and pulse control logic controls a selector for selecting any one of the pulse streams. In a first mode of operation, the control logic monitors the charge pump/filter output and selects the pulse stream which minimizes change in the output. The selection is fixed and the output of the charge pump/filter is then supplied as a correction signal to the control input of the analog delay line. Such an arrangement may be used to maintain minimum phase imbalance in I and Q signal paths of a quadrature frequency converter.

REFERENCES:
patent: 6518807 (2003-02-01), Cho
patent: 6519305 (2003-02-01), Roth et al.
patent: 7245117 (2007-07-01), Joy et al.
patent: 7327179 (2008-02-01), Sawyer et al.
patent: 2002/0024366 (2002-02-01), Ooishi et al.
patent: 2002/0065057 (2002-05-01), Kasperkovitz
patent: 2005/0127964 (2005-06-01), Lee
patent: 2005/0285643 (2005-12-01), Lee
patent: 2006/0281432 (2006-12-01), Isaac et al.
patent: 4025245 (1992-01-01), None
patent: 6097755 (1994-04-01), None

Affiliated with

Also associated with

Rating

Variable signal delaying circuit, quadrature frequency... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable signal delaying circuit, quadrature frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable signal delaying circuit, quadrature frequency... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4103600