A method for the self-calibration of a phases - integration error in a modulator

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.