Title: Quadrature frequency changer, tuner and modulator
Application Number: 200610115522 Application Date: 2006.08.15
Publication Number: 1917500 Publication Date: 2007.02.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04L27/26;H03M3/02
Applicant(s) Name: Intel Corp. Address:
Inventor(s) Name: Ali Isaac;Cowley Nicholas P.
Attorney & Agent: li tianjiang
Abstract:
    A quadrature frequency changer comprises first and second mixers (4-6, 7-9) and a local oscillator (10-12). The local oscillator (10-12) provides first and second commutating signals which are nominally in phase-quadrature and includes an arrangement (12) for changing the phase of the first commutating signal by 180{ to provide a third commutating signal. The first mixer (4-6) comprises first and second mixing stages (4,5) for mixing an input signal with the first and second commutating signals and a summer (6) for summing the mixer stage output signals. The second mixer comprises third and fourth mixing stages (7, 8) for mixing the same or a different input signal with the second and third commuting signals and a summer (9) for summing the third and fourth mixer stage output signals.
Time: 14
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