Technique for crosstalk reduction

摘要

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.

主权项

1. An arrangement for reducing crosstalk between a first controlled oscillator and a second controlled oscillator both comprised in an integrated circuit, each controlled oscillator (CO) adapted to output a respective clock signal, the arrangement comprising:
a first 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 detector comprises:
a mixer stage adapted to produce a mixed signal (m1(t)) by mixing the clock signal (S1(t)) generated by the second CO with a CO clock signal having a fixed relationship with the clock signal (S1(t)) generated by the second CO;a filter adapted to at least partially remove at least one or more of one or more DC components and one or more undesired mixing products from 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)); andan output for outputting the DC signal as an indication for the crosstalk signal.