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US 2009/0268101 A1Published application
Direct conversion television receiver
OwnerParveen Shukla, Bernard Arambepola +2inventors
InventorsParveen Shukla, Bernard Arambepola, Thushara Hewavithana, Nick Cowley
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Abstract
A direct conversion television receiver may include a phase de-rotator which substantially undoes the phase rotation of a phase rotator. The phase de-rotator takes the low pass filtered signal and substantially removes the rotation caused by the phase rotator. As a result, it is easier to estimate the phase and gain imbalance and to make a correction for the phase and gain imbalance, via a feedback loop, without the effects of phase rotation.
Claims15
A method comprising:
- phase rotating an input signal in a direct conversion receiver;
- low pass filtering the phase rotated signal;
- phase de-rotating the filtered, rotated signal;
- estimating the phase and gain imbalance;
- using the estimate for phase and gain imbalance correction;
- applying the phase and gain imbalance correction at the point before the phase rotation of the input, via a feedback loop.
3 more elements
A direct conversion television receiver comprising:
- a phase rotator;
- a low pass filter coupled to said phase rotator;
- a phase de-rotator coupled to said low pass filter;
- and
- a phase and gain imbalance correction unit coupled to said phase de-rotator.
2 more elements
Dependencies are inferred from the claim text.