Technique for crosstalk reduction
First Claim
1. An arrangement for reducing crosstalk between a first controlled oscillator and a second controlled oscillator, the arrangement comprising:
- a first crosstalk detector adapted to detect a crosstalk signal generated by the first controlled oscillator (CO) to the second controlled oscillator (CO);
a first crosstalk cancellation circuit adapted to generate a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal; and
a first cancellation signal injector adapted to introduce the cancellation signal into the second CO, whereinthe first crosstalk detector comprises;
a mixer stage adapted to produce a mixed signal (m1(t)) by mixing a clock signal (S1(t)) generated by the second CO with a signal having a fixed relationship with the clock signal (S1(t)) generated by the second CO;
a filter adapted to filter the mixed signal (m1(t)) to produce a filtered signal;
a signal converter adapted to down-convert the filtered signal into a DC signal (m2(t)); and
an output for outputting the DC (m2(t)) signal as an indication for the crosstalk signal.
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Accused Products
Abstract
A technique for cancelling or reducing crosstalk signals between controlled oscillators in an integrated circuit is provided. The technique involves an arrangement adapted to reduce a crosstalk signal generated by a first controlled oscillator to a second oscillator both comprised in the integrated circuit, wherein both controlled oscillators are configured to output a respective clock signal. The arrangement comprises a detector adapted to detect the crosstalk signal generated by the first controlled oscillator to the second controlled oscillator, a crosstalk cancellation circuit adapted to generate a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal, and a cancellation signal injector adapted to introduce the cancellation signal into the second controlled oscillator.
49 Citations
14 Claims
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1. An arrangement for reducing crosstalk between a first controlled oscillator and a second controlled oscillator, the arrangement comprising:
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a first crosstalk detector adapted to detect a crosstalk signal generated by the first controlled oscillator (CO) to the second controlled oscillator (CO); a first crosstalk cancellation circuit adapted to generate a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal; and a first cancellation signal injector adapted to introduce the cancellation signal into the second CO, wherein the first crosstalk detector comprises; a mixer stage adapted to produce a mixed signal (m1(t)) by mixing a clock signal (S1(t)) generated by the second CO with a signal having a fixed relationship with the clock signal (S1(t)) generated by the second CO; a filter adapted to filter the mixed signal (m1(t)) to produce a filtered signal; a signal converter adapted to down-convert the filtered signal into a DC signal (m2(t)); and an output for outputting the DC (m2(t)) signal as an indication for the crosstalk signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio communication device, comprising:
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an integrated circuit having a first controlled oscillator and a second controlled oscillator; and an arrangement for reducing a crosstalk signal generated by the first controlled oscillator to the second controlled oscillator, the arrangement comprising; a first crosstalk detector adapted to detect the crosstalk signal generated by the first controlled oscillator (CO) to the second controlled oscillator (CO); a first crosstalk cancellation circuit adapted to generate a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal; and a first cancellation signal injector adapted to introduce the cancellation signal into the second CO, wherein the first crosstalk detector comprises; a mixer stage adapted to produce a mixed signal (m1(t)) by mixing a clock signal (S1(t)) generated by the second CO with a signal having a fixed relationship with the clock signal (S1(t)) generated by the second CO; a filter adapted to filter the mixed signal (m1(t)) to produce a filtered signal; a signal converter adapted to down-convert the filtered signal into a DC signal (m2(t)); and an output for outputting the DC signal as an indication for the crosstalk signal.
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12. A method of reducing a crosstalk signal generated by a first controlled oscillator to a second controlled oscillator both comprised in an integrated circuit, the method being performed by an electronic device and comprising the steps of:
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the electronic device detecting a crosstalk signal generated by the first controlled oscillator (CO) to the second controlled oscillator (CO); the electronic device generating a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal; the electronic device injecting the cancellation signal into the second CO to reduce the crosstalk signal; the electronic device producing a mixed signal (m1(t)) by mixing a clock signal (S1(t)) generated by the second CO with a signal having a fixed relationship with the clock signal (S1(t)) generated by the second CO; the electronic device filtering the mixed signal (m1(t)) to produce a filtered signal; the electronic device down-converting the filtered signal into a DC signal (m2(t)); and the electronic device outputting the DC signal as an indication for the crosstalk signal. - View Dependent Claims (13)
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14. A method of reducing a crosstalk signal generated by a first controlled oscillator to a second controlled oscillator both comprised in an integrated circuit, each of the controlled oscillators adapted to output a respective clock signal, the method being performed by an electronic device and comprising the steps of:
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the electronic device detecting a first crosstalk signal generated by the first controlled oscillator (CO); the electronic device generating a first cancellation signal having an amplitude substantially the same as that of the first crosstalk signal and a phase substantially opposite to that of the first crosstalk signal; the electronic device injecting the first cancellation signal into the second CO; the electronic device detecting a second crosstalk signal generated by the second CO to the first CO; the electronic device generating a second cancellation signal having an amplitude substantially the same as that of the second crosstalk signal and a phase substantially opposite to that of the second crosstalk signal; and the electronic device injecting the second cancellation signal into the first CO.
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Specification