| 摘要 |
Apparatus are provided for continuous-time sigma-delta modulators. A sigma-delta modulator (100, 200, 300) comprises a quantizer (106, 206, 306) configured to convert an analog signal to a digital value. A main feedback arrangement (108, 208, 308) is coupled to the quantizer (106, 206, 306), and the main feedback arrangement (108, 208, 308) delays the digital value by a first delay period and generates a main feedback signal based on the delayed value. A compensation feedback arrangement (110, 210, 310) is coupled to the quantizer (106, 206, 306), and compensation feedback arrangement (110, 210, 310) delays the digital value by a second delay period and generates a compensation feedback signal based on the delayed value. A forward signal arrangement (104, 204, 304) produces the analog signal at the quantizer (106, 206, 306) based on an input signal, the main feedback signal, and the compensation feedback signal. The second delay period is independent of and is not influenced by the first delay period, and the second delay period is chosen such that the compensation feedback signal compensates for the first delay period. |
