RC and SC filter compensation in a radio transceiver
AssigneeNokia Corporation
InventorsJaako Maunuksela, Jussi Vepsäläinen, Tuomas Honkanen
Life of this patent
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Abstract
Disclosed is apparatus for operating with an RC filter (26, 26A), and a corresponding method. The apparatus includes circuitry (32) for use in measuring an actual value of at least one filter component and a controller (34), coupled to the measurement circuitry, for determining at least one adaptive filter (36, 46) coefficient using the measured actual value to so as to compensate for a deviation of at least one filter component value from an ideal value. Where the filter is embodied as an RC network, the circuitry measures an actual value of both a resistor and a capacitor, and the controller uses the measured actual value of the capacitor when determining the value of a resistor.
Claims7
A method to operate a mobile station, comprising:
- measuring an actual value of at least one filter component value;
- and
- determining at least one downstream adaptive filter coefficient using the measured actual value to so as to compensate the mobile station for a deviation of at least one filter component value from an ideal value,
- where the filter comprises an RC network, and where measuring measures an actual value of a capacitor, and then uses the measured actual value of the capacitor when measuring the value of a resistor.
A method to operate a mobile station, comprising:
- measuring an actual value of at least one filter component value;
- and
- determining at least one downstream adaptive filter coefficient using the measured actual value to so as to compensate the mobile station for a deviation of at least one filter component value from an ideal value, where the filter comprises an RC network, and where measuring comprises:
- determining a first amount of time required to charge a capacitor from a constant current source from an initial voltage to a threshold voltage;
- determining the actual value of the capacitor using the first amount of time;
- determining a second amount of time required to charge the capacitor from the initial voltage to the threshold voltage using a predetermined voltage applied through a resistor;
- and
- determining the actual value of the resistor using the second amount of time and the determined actual value of the capacitor.
A method to operate a mobile station, comprising:
- measuring an actual value of at least one filter component value;
- and
- determining at least one downstream adaptive filter coefficient using the measured actual value so as to compensate the mobile station for a deviation of at least one filter component value from an ideal value,
- where the filter comprises an RC network, where measuring is used to determine a value of parameters kR and kC, and further comprising calculating the actual value of a resistor (Ract) and a capacitor (Cact) using kR and kC, respectively.
A method to operate a mobile station, comprising:
- measuring an actual value of the at least one filter component value;
- and
- determining at least one downstream adaptive filter coefficient using the measured actual value so as to compensate the mobile station for a deviation of at least one filter component value from an ideal value,
- where the at least one filter coefficient is obtained from an s-domain transfer function by performing a z-transformation.
Apparatus for operating with an RC filter comprising components integrated upon an integrated circuit, comprising:
- circuitry, included as a part of said integrated circuit, for use in measuring an actual value of at least one filter component;
- and
- a controller, coupled to said measurement circuitry, for determining at least one adaptive filter coefficient using the measured actual value so as to compensate for a deviation of at least one filter component value from an ideal value,
- where the filter comprises an RC network, and where said circuitry measures an actual value of a capacitor, and said controller then uses the measured actual value of the capacitor when determining the value of a resistor.
Apparatus for operating with an RC filter comprising components integrated upon an integrated circuit, comprising:
- circuitry, included as a part of said integrated circuit, for use in measuring an actual value of at least one filter component;
- and
- a controller, coupled to said circuitry, for determining at least one adaptive filter coefficient using the measured actual value so as to compensate for a deviation of at least one filter component value from an ideal value,
- where the filter comprises an RC network, and where said circuitry comprises:
- means for determining a first amount of time required to charge a capacitor from a constant current source from an initial voltage to a threshold voltage, and where said controller determines the actual value of the capacitor using the first amount of time;
- and
- means for determining a second amount of time required to charge the capacitor from the initial voltage to the threshold voltage using a predetermined voltage applied through a resistor;
- and where said controller determines the actual value of the resistor using the second amount of time and the determined actual value of the capacitor.
Dependencies are inferred from the claim text.