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A method for design of high-order sigma-delta modulator is proposed to generate high-precision analog signals for Built-In-Self-Test (BIST) of mixed-signal integrated circuits. The noise transfer function of the sigma-delta modulator is achieved by the sigma-delta toolbox. Using Determination Decision Diagram (DDD), symbolic transfer functions of the sigma-delta modulator are represented exactly and efficiently, and are applied to its coefficient quantization. The experiment on 4th-order sigma-delta modulator demonstrates that the in-band noise attenuation can also be kept to a maximum after quantization.