Transmitter linearity built-in-self-test
First Claim
1. An apparatus for testing a circuit, comprising:
- a source signal input configured to receive a source signal;
an evaluation signal input configured to receive an evaluation signal;
a coefficient extractor configured to extract a plurality of polynomial coefficients representing the evaluation signal and the source signal;
a weight factor storage containing a plurality of weight factors corresponding to frequency filters; and
an Adjacent Channel Power Ratio (ACPR) calculatorconfigured to calculate an ACPR value from the evaluation signal and the source signal by applying the plurality of weight factors from the weight factor storage to the plurality of coefficients the plurality of weight factors selected according to a main channel frequency range and an adjacent channel frequency range andconfigured to determine whether the ACPR value is within an acceptable range and generating a corresponding indication.
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Accused Products
Abstract
An apparatus for testing a circuit includes a source signal input configured to receive a source signal, an evaluation signal input configured to receive an evaluation signal, and a coefficient extractor configured to extract a plurality of coefficients of a preselected polynomial representing the evaluation signal and the source signal. A weight factor storage contains a plurality of weight factors corresponding to frequency filters. An Adjacent Channel Power Ratio (ACPR) calculator is configured to calculate an ACPR value from the evaluation signal and the source signal by applying the plurality of weight factors from the weight factor storage to the plurality of coefficients the plurality of weight factors selected according to a main channel frequency range and an adjacent channel frequency range, and determining whether the ACPR value is within an acceptable range and generating a corresponding indication.
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Citations
20 Claims
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1. An apparatus for testing a circuit, comprising:
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a source signal input configured to receive a source signal; an evaluation signal input configured to receive an evaluation signal; a coefficient extractor configured to extract a plurality of polynomial coefficients representing the evaluation signal and the source signal; a weight factor storage containing a plurality of weight factors corresponding to frequency filters; and an Adjacent Channel Power Ratio (ACPR) calculator configured to calculate an ACPR value from the evaluation signal and the source signal by applying the plurality of weight factors from the weight factor storage to the plurality of coefficients the plurality of weight factors selected according to a main channel frequency range and an adjacent channel frequency range and configured to determine whether the ACPR value is within an acceptable range and generating a corresponding indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for testing a circuit, comprising:
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a transceiver having a transceiver input and a transceiver output; a two-tone source coupled to the transceiver input; and an adjacent channel power ratio (ACPR) estimator coupled to the transceiver output and coupled to the two-tone source, the ACPR estimator configured to calculate coefficients of a polynomial representation of an output signal of the transceiver output, to apply stored weight factors to the coefficients to calculate an ACPR value the stored weight factors corresponding to a main channel frequency range and an adjacent channel frequency range, and configured to determine whether the ACPR is within an acceptable range and generate a corresponding indicator. - View Dependent Claims (12, 13, 14, 15)
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16. A method of testing a circuit comprising:
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receiving an evaluation signal from a transceiver; calculating a plurality of polynomial coefficients for a polynomial expression corresponding to the evaluation signal; selecting a set of first weight factors according to a main channel frequency range; applying the set of first weight factors to the plurality of polynomial coefficients to obtain a main channel power; selecting a set of second weight factors according to an adjacent channel frequency range; applying the set of second weight factors to the plurality of polynomial coefficients to obtain an adjacent channel power; calculating an Adjacent Channel Power Ratio (ACPR) value from a ratio of the adjacent channel power to the main channel power; and determining whether the ACPR value is within an acceptable range and generating a corresponding indicator. - View Dependent Claims (17, 18, 19, 20)
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Specification