Phase shift circuit and phase correcting method
AssigneeFujitsu Limited
InventorKazuhiro Tomita
Life of this patent
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Abstract
A phase shift circuit includes a 45° phase corrector that performs vector synthesis of signals supposed to have a 45° phase difference, out of a plurality of sets of orthogonal phase signals having an about 45° phase difference and an equal amplitude, the orthogonal phase signals in each set having undergone 90° phase correction, and outputs signals resulting from the vector synthesis, whereby a phase error between the orthogonal phase signals in the different sets is eliminated by the vector synthesis to make it possible to correct their phase difference to accurately 45°.
Claims18
A phase shift circuit comprising a 45° phase corrector that is supplied with a plurality of sets of orthogonal phase signals in which each set consists of respective first and second orthogonal phase signals, each having undergone a 90° phase correction and which have an about 45° phase difference and an equal amplitude, relative to respective first and second orthogonal phase signals of a different set of the plurality of sets of orthogonal phase signals, and that performs vector synthesis of signals supposed to have a 45° phase difference, out of the supplied sets of orthogonal phase signals, to output signals resulting from the vector synthesis.
A phase shift circuit comprising a plurality of first adders each of which receives two signals supposed to have a 45° phase difference, out of a plurality of sets of orthogonal phase signals having an about 45° phase difference and an equal amplitude, relative to respective first and second orthogonal phase signals of a different set of the plurality of sets of orthogonal phase signals, the orthogonal phase signals in each set having undergone a 90° phase correction, and adds the two signals to output an addition result.
A phase correcting method, comprising:
- a 45° correction step of performing vector synthesis of signals supposed to have a 45° phase difference, out of a plurality of sets of supplied orthogonal phase signals having an about 45° phase difference and an equal amplitude, relative to respective first and second orthogonal phase signals of a different set of the plurality of sets of orthogonal phase signals, the orthogonal phase signals in each set having undergone 90° phase correction, to generate signals having a 45° phase difference.
Dependencies are inferred from the claim text.