RF filter adjustment based on LC variation
AssigneeMicrotune (Texas), L.P.
InventorsTimothy M. Magnusen, Jan-Michael Stevenson
Life of this patent
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Abstract
A system for processing a signal comprises a Radio Frequency (RF) signal tuner, one or more filters in a signal path of the RF tuner each based on Inductive/Capacitive (LC) circuitry, a variation unit operable to measure a variation of the LC circuitry, and a frequency control unit adapted to adjust the one or more filters based on the LC variation during operation of the tuner.
Claims25
A system for processing a signal, said system comprising:
- a Radio Frequency (RF) circuit;
- one or more filters in a signal path of said RF circuit each based on Inductive Capacitive (LC) circuitry;
- an LC variation unit operable to measure a variation of said LC circuitry, wherein said variation of said LC circuitry comprises a difference between an actual characteristic of said LC circuitry and a nominal characteristic of said LC circuitry;
- and
- a frequency control unit adapted to adjust said one or more filters based at least in part on said LC variation during operation of said RF circuit.
A method for processing a signal with a Radio Frequency (RF) signal tuner, said method comprising:
- measuring a variation of Inductive Capacitive (LC) circuitry, wherein said variation of said LC circuitry comprises a difference between an actual characteristic of said LC circuitry and a nominal characteristic of said LC circuitry, wherein one or more filters in a signal path of said RF tuner each include LC circuitry;
- during operation of said signal tuner, making tuning adjustments based, at least in part, on said measured variation.
A method for operating a tuning circuit, said method comprising:
- receiving data indicative of on-chip process variation of Inductive Capacitive (LC) circuitry, wherein said variation of said LC circuitry comprises a difference between an actual characteristic of said LC circuitry and a nominal characteristic of said LC circuitry, and wherein a Radio Frequency (RF) filter unit in a signal path of an RF tuner includes LC circuitry;
- receiving data indicative of a signal for processing
- adjusting said RF filter unit as a function of said variation and of said signal for processing.
A system for processing a signal with a Radio Frequency (RF) signal tuner, said method comprising:
- means for measuring a variation of Inductive Capacitive (LC) circuitry, wherein said variation of said LC circuitry comprises a difference between an actual characteristic of said LC circuitry and a nominal characteristic of said LC circuitry, wherein one or more RF filters in a signal path of said RF tuner each include LC circuitry;
- means for measuring a center frequency of an Intermediate Frequency (IF) filter in said signal path;
- means for making tuning adjustments based, at least in part, on said measured variation during operation of said RF signal tuner;
- and
- means for generating a local oscillator frequency based, at least in part, on said measured IF filter center frequency.
A system for processing a signal, said system comprising:
- a Radio Frequency (RF) signal tuner at least partly disposed upon a semiconductor chip;
- an RF filter at an input of a signal path of said RF tuner based on Inductive Capacitive (LC) circuitry;
- a first mixer adapted to receive output from said RF filter, said first mixer controlled by a first local oscillator;
- a first Intermediate Frequency (IF) filter adapted to receive output from said first mixer and to produce a first IF signal;
- a second mixer adapted to receive said first IF signal;
- a second IF filter adapted to receive output from said second mixer to produce an IF output signal;
- an LC variation unit operable to measure a variation of said LC circuitry, wherein said variation of said LC circuitry comprises a difference between an actual characteristic of said LC circuitry and a nominal characteristic of said LC circuitry;
- a center frequency measurement unit adapted to determine a center frequency of said first IF filter;
- and
- a frequency control unit adapted to:
- adjust said RF filter based at least in part on said LC variation during operation of said tuner;
- and
- adjust a frequency of said first local oscillator based at least in part on said center frequency of said first IF filter.
Dependencies are inferred from the claim text.