摘要
设计了一种应用于音频的5阶离散时间单环单比特量化ΣΔ调制器.提出一种改进的开关型AB类运算跨导放大器(OTA)电路,实现了低电压下积分器的低功耗和高转换速率.OTA仅在半时钟周期工作,有效降低调制器功耗.电路采用TSMC 0.18μm 1P4M标准CMOS工艺实现,后仿真结果表明,无杂散动态范围(SFDR)和信号噪声失真比(SNDR)分别达97.6dB和87.3dB,调制器版图面积0.4mm2.在1V电源电压下,消耗电流260μA,品质因数(FoM)达到286fJ/c-step,实现了低压低功耗高精度的设计目标.
Abstract： A 5th-order discrete-time （DT） single-loop single-bit-quantized ΣΔmodulator for audio application was designed. An improved Class-AB switched-OTA was proposed, which made the integrator achieve low power dissipation and high slew rate in low voltage. OTA worked at half of the clock cycle and effectively saved power of the modulator. Post simulation showed that the modulator achieved 97. 6-dB SFDR and 87.3-dB SNDR. The total area was 0. 4 mm2. At ΣΔ power supply, the modulator consumed 260 9A current and the FoM was 286 ΣΔ-step, which achieved the low-voltage low-power high-accuracy design target.
出处
《微电子学与计算机》
CSCD
北大核心
2017年第9期53-57,共5页
Microelectronics & Computer
基金
红外成像材料与器件重点实验室开放基金对本课题资助
