Back to results
US 7,609,776 B2Granted
Quadrature frequency changer, tuner and modulator
AssigneeIntel Corporation
InventorsIsaac Ali, Nicholas Paul Cowley
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeIntel Corporation
InventorsIsaac Ali, Nicholas Paul Cowley
Estimating the term…
A quadrature frequency changer comprising first and second mixers and a local oscillator and a tuner and modulator including the quadrature frequency changer are provided. The local oscillator provides first and second commutating signals which are nominally in phase-quadrature and includes an arrangement for changing the phase of the first commutating signal by 180° to provide a third commutating signal. The first mixer comprises first and second mixing stages for mixing an input signal with the first and second commutating signals and a summer for summing the mixer stage output signals. The second mixer comprises third and fourth mixing stages for mixing the same or a different input signal with the second and third commuting signals and a summer for summing the third and fourth mixer stage output signals.
A quadrature frequency changer comprising:
A tuner including a quadrature frequency changer comprising first and second mixers and a local oscillator, said local oscillator being arranged to provide first and second commutating signals which are nominally in phase-quadrature and including an arrangement for changing a phase of said first commutating signal by 180° to provide a third commutating signal, said first mixer comprising first and second mixing stages for mixing a first input signal with said first and second commutating signals, respectively, and a first linear combiner for forming a linear combination of output signals of said first and second mixing stages, said second mixer comprising third and fourth mixing stages for mixing a second input signal with said second and third commutating signals, respectively, and a second linear combiner for forming a linear combination of output signals of said third and fourth mixing stages.
A modulator including a quadrature frequency changer comprising first and second mixers and a local oscillator, said local oscillator being arranged to provide first and second commutating signals which are nominally in phase-quadrature and including an arrangement for changing a phase of said first commutating signal by 180° to provide a third commutating signal, said first mixer comprising first and second mixing stages for mixing a first input signal with said first and second commutating signals, respectively, and a first linear combiner for forming a linear combination of output signals of said first and second mixing stages, said second mixer comprising third and fourth mixing stages for mixing a second input signal with said second and third commutating signals, respectively, and a second linear combiner for forming a linear combination of output signals of said third and fourth mixing stages.
Dependencies are inferred from the claim text.