Infineon Technologies Ag

Gerhard N&ouml;ssing

Christian Jenkner

Herbert Zojer

David Schwingshackl

A method for resynchronizing a clock signal, includes the steps of defining a presettable clock signal, dividing a first clock signal having a first frequency with a programmable digital frequency divider to produce a second clock signal having a second frequency, measuring the second clock signal with a digital control circuit, and programming a programmable digital frequency divider with the digital control circuit, such that the second clock signal corresponds to the presettable clock signal. The invention also includes a circuit configuration for resynchronizing a clock signal, including a programmable digital frequency divider for dividing a first clock signal to produce second clock signal, a digital measuring circuit, connected to the frequency divider, for measuring the second clock signal and generating an output signal, and a digital control circuit, connected to the frequency divider and to the measuring circuit, for evaluating the output signal from the measuring circuit and for adjusting the frequency divider.

Method and circuit configuration for resynchronizing a clock signal

Method for measuring a load impedance (Z ) of a load circuit which is connected to an SLIC circuit ( ) of an analog terminal connection of a terminal device, having the following steps: specifically a digital toll signal (x ) is generated by means of a Codec circuit ( ) connected to the SLIC circuit ( ), said toll signal (x ) being converted into an analog toll signal; the analog toll signal is output by the SLIC circuit ( ) to the load circuit; an analog voltage which is brought about at the terminal connection ( ) of the terminal device of the SLIC circuit ( ) via the analog toll signal is sensed; the digital toll signal (x ) is filtered by means of an adaptive filter ( ) which is provided in the Codec circuit ( ) and has adjustable filter coefficients (g , g ) for generating a filtered digital comparison signal (y ) which is converted into an analog comparison voltage (U ); the filter coefficients (g , g ) of the adaptive filter ( ) are adjusted until the analog comparison voltage (U ) and the analog voltage (U ), brought about by the analog toll signal, at the terminal connection ( ) of the terminal device are the same; the complex load impedance (Z ) of the load circuit is calculated as a function of the set filter coefficients (g , g )

Growing community of inventors

Villach, Austria

Gerhard Nössing

Growing community of inventors

Villach, Austria

Gerhard N&ouml;ssing

Gerhard Nössing