Compensation of mismatch between quadrature paths
First Claim
1. An apparatus for improving signal mismatch compensation, the signal mismatch occurs between first and second RF signals, the apparatus comprising:
- at least one switch which applies a first RF signal, present on a first pathway, and a second RF signal, present on a second pathway, to respective first and second frequency mixers, during a first time period;
the mixers providing a first pair of mixed first and second RF signals;
means for reversing the at least one switch, during a subsequent time period, so that the first RF signal is applied to the second mixer, via the second pathway, and the second RF signal is applied to the first mixer, via the first pathway;
the mixers thereby provide a second pair of mixed first and second RF signals;
monitoring means provided to monitor respective first and second pairs of mixed RF signals during an interval, said interval comprising a plurality of sequential time periods;
the monitoring means providing time averaged values for the first and second signals in each of said first and second pairs of RF signals, so that effects of signal mismatch on the first and second RF signals are minimised in each channel, by subjecting said RF signals in each channel, for substantially the same time, to the same pathways.
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Abstract
An apparatus for improving signal mismatch compensation between first and second RF signals comprises: at least one switch which applies a first RF signal, present on a first pathway, and a second RF signal, present on a second pathway, to respective first and second frequency mixers, during a first time period; the mixers provide a first pair of mixed first and second RF signals. Means for reversing the at least one switch, during a subsequent time period is provided so that the first RF signal is applied to the second mixer, via the second pathway, and the second RF signal is applied to the first mixer, via the first pathway. The mixers thereby provide a second pair of mixed first and second RF signals. Monitoring monitors respective first and second pairs of mixed RF signals during an interval. The monitoring means provides time averaged values for the first and second signals in each of said first and second pairs of RF signals, so that effects of signal mismatch on the first and second RF signals are minimised in each channel, by subjecting said RF signals in each channel, for substantially the same time, to the same pathways.
49 Citations
22 Claims
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1. An apparatus for improving signal mismatch compensation, the signal mismatch occurs between first and second RF signals, the apparatus comprising:
- at least one switch which applies a first RF signal, present on a first pathway, and a second RF signal, present on a second pathway, to respective first and second frequency mixers, during a first time period;
the mixers providing a first pair of mixed first and second RF signals;
means for reversing the at least one switch, during a subsequent time period, so that the first RF signal is applied to the second mixer, via the second pathway, and the second RF signal is applied to the first mixer, via the first pathway;
the mixers thereby provide a second pair of mixed first and second RF signals;
monitoring means provided to monitor respective first and second pairs of mixed RF signals during an interval, said interval comprising a plurality of sequential time periods;
the monitoring means providing time averaged values for the first and second signals in each of said first and second pairs of RF signals, so that effects of signal mismatch on the first and second RF signals are minimised in each channel, by subjecting said RF signals in each channel, for substantially the same time, to the same pathways. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- at least one switch which applies a first RF signal, present on a first pathway, and a second RF signal, present on a second pathway, to respective first and second frequency mixers, during a first time period;
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17. A method of signal mismatch compensation comprising:
- applying a first training signal, of known characteristics, to a circuit which includes at least one filter, receiving a filtered training signal, from the circuit, deriving a transfer function from the received filtered signal;
obtaining the inverse transfer function and applying the inverse transfer function to a subsequently received signal in order to correct any signal mismatch in the subsequently received signal. - View Dependent Claims (18, 19, 20, 21, 22)
- applying a first training signal, of known characteristics, to a circuit which includes at least one filter, receiving a filtered training signal, from the circuit, deriving a transfer function from the received filtered signal;
Specification
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- Resources
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Current AssigneeFreescale Semiconductor, Inc. (NXP Semiconductors NV)
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Original AssigneeFreescale Semiconductor, Inc. (NXP Semiconductors NV)
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InventorsSimoens, Sebastien, Gercekci, Anil, Lehning, Heinz
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Application NumberUS10/482,088Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current455/303CPC Class CodesH04L 2027/0016 Stabilisation of local osci...H04L 27/00 Modulated-carrier systemsH04L 27/0014 Carrier regulation of chaot...
