Title: Trigonometric integral modulator with self-correction function
Application Number: 200610154303 Application Date: 2006.09.20
Publication Number: 1983821 Publication Date: 2007.06.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03M3/02;H03M1/12
Applicant(s) Name: Ruiyu Semiconductor Co., Ltd. Address:
Inventor(s) Name: Hsieh Hong-yean;Lin Chia-liang
Attorney & Agent: wangzhi sen huangxiao lin
Abstract:
    The invention discloses a self-calibrating delta integral modulator which determines whether time constants of its internal integrators are too large or too small by injecting a calibrating sequence into the modulator and examining a correlation between the calibrating sequence and a modulator output sequence. Then the time constants of the internal integrators are adjusted accordingly. In one embodiment, the correlation is exploited based on matching a noise transfer function of the modulator using an adaptive filter based on a least mean square algorithm.
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