Control loop filter

Details Control loop filter Control loop filter

2007-12-04

2007-12-04

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S016000

Reexamination Certificate

active

11257407

ABSTRACT:
A feedback control loop having a filter response and a cut-off frequency comprises a system under control for generating an output signal being an output signal of the feedback control loop in response to a control difference signal, a loop filter for generating a feedback signal in response to the output signal and a subtraction device for generating the control difference signal by subtracting the feedback signal from an input signal fed to the feedback control loop. The loop filter is adjustable by means of a filter coefficient set having in each case at least one filter coefficient, each depending on a setting parameter, so that a filter coefficient set for adjusting the filter response of the feedback control loop can be selected and the cut-off frequency of the feedback control loop is adjustable externally in a manner dependent on the setting parameter.

REFERENCES:
patent: 6018556 (2000-01-01), Janesch et al.
patent: 6108151 (2000-08-01), Tuttle et al.
patent: 2004/0012448 (2004-01-01), Bonhaus et al.
patent: 2004/0183602 (2004-09-01), Maunuksela et al.
patent: 19612884 (2003-03-01), None
patent: 01084302 (1989-03-01), None
German Office Action dated Jun. 24, 2005.
Chinese Office Action dated Aug. 3, 2007 (with English translation).

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