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US 8,301,102 B2Granted
Correcting quadrature crosstalk contamination in receivers
AssigneeIntel Corporation
InventorsIsaac Ali, Nicholas P. Cowley
Life of this patent
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Abstract
An apparatus, a method and a system for correcting a phase imbalance are described. Embodiments may measure the phase imbalance inherent in a tuner and use the imbalance measure to correct the output of the tuner. Embodiments may include a tone generator to produce a single frequency tone and a tuner to receive the single frequency tone and output an intermediate frequency. The intermediate frequency may be corrected by a correction loop. Other embodiments are described and claimed.
Claims14
An apparatus comprising:
- a tuner to receive a tone and perform quadrature demodulation on the tone producing an in-phase reference branch (I branch) and a quadrature phase (Q branch) and outputting an intermediate frequency (IF);
- a first multiplier stage coupled to the I branch to generate a local oscillator (LO) signal;
- a second multiplier stage coupled to the output of the tuner to generate an error signal from the IF output;
- a mixer to mix the output of the first and second multiplier stages;
- a signal cleaner to clean the outputs of the first and second multiplier stages;
- and
- an integrator to integrate the cleaned signals.
4 more elements
A system for correcting quadrature crosstalk contamination, comprising:
- a tone generator to produce a single frequency tone;
- a tuner to receive the single frequency tone and output an intermediate frequency, wherein the tuner performs quadrature demodulation on the single-frequency tone to produce an in-phase reference branch (I branch) and a quadrature phase (Q branch) and a quadrature phase (Q branch) and to output an intermediate frequency (IF);
- and
- a correction loop to correct a phase imbalance introduced by the tuner to the intermediate frequency, the correction loop comprises:
- a first multiplier stage coupled to the I branch to generate a local oscillator (LO) signal;
- a second multiplier stage coupled to the output of the tuner to generate an error signal from the IF output;
- a mixer to mix the output of the first and second multiplier stages;
- a signal cleaner to clean the outputs of the first and second multiplier stages;
- and
- an integrator to integrate the cleaned signals.
7 more elements
Dependencies are inferred from the claim text.