| 摘要 |
A method of self-calibrating a modulator comprising at least one integrator (23, 24) liable to incur a phase error is disclosed. Advantageously according to the invention, the calibration method comprises at least one step of reading a response to pulse of said modulator, a step of calculating a phase error parameter (b1, b2) of the integrator, and a step of calibrating the phase error parameter (b1, b2). In addition, the calibration step provides a count (N1) of response-to-pulse samples lying above suitable threshold values (y1), and a change in the value (Cv) of a capacitor associated with the integrator according to the sample count (N1). Also disclosed is an integrator system with phase error correction, which comprises an integrator (17), having an input terminal (A) connected to an inverting output terminal (B) through a first feedback capacitor (C1), and a second input capacitor (C2) connected between a first input terminal (IN+) of the integrator system and the input terminal (A) of the integrator (17). Advantageously according to the invention, the integrator system further comprises a phase error correction portion (18) feedback connected between the output terminal (B) and the input terminal (A) of the integrator (17), the correction portion (18) having a variable capacitance value. <IMAGE>
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