어쿠스틱 센서 IC용 4차 단일 비트 연속 시간 시그마-델타 모듈레이터

초록

This paper presents the design of continuous-time sigma-delta modulator for acoustic sensor. The feedforward structure without summing block is used to reduce power consumption of sigma-delta modulator. A high-linearity active-RC filter is used to improve resolution of sigma-delta modulator. Excess loop delay problem in conventional continuous-time sigma-delta modulators is solved by our proposed architecture. A low power, high resolution fourth-order continuous-time sigma-delta modulator with 1-bit quantization was realized in a 0.13-㎛, 1-poly 8-metal CMOS technology, with a core area of 0.58 ㎟. Simulation results show that the modulator achieves 91.3-㏈ SNR over a 25-㎑ signal bandwidth with an oversampling ratio of 64, while dissipating 290 ㎼ from a 3.3-V supply.

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