摘要
在1.8V电压下,使用UMC0.18μm混合信号工艺,设计实现了一个用于音频系统的19位20kHz数模转换器(DAC),其中包括了一个单环多比特Δ∑调制器和一个用于平滑效果的开关电容滤波器(SCF);仿真结果表明,在64倍过采样率、5bit信号量化时,DAC能够实现17.22bit的转换精度,模拟电路部分功耗只有6.9mW,考虑到数字部分,功耗和品质因素(FOM)值P/(2×BW×2ENOB)≤3pJ/step;芯片版图面积约为1.4mm×1.6mm。
A 19 bit 20 kHz digital to analog DAC was designed in UMC 0.18 μm CMOS technology with 1.8 V power supply. The DAC includes a single-loop multi-bit △∑ modulator and a switched capacitor filter. According to the simulation in spectre-verilog, it can realize 17.22 bit resolutions under 64 times over-sample ratio while in 5-bit quantization. The power used in analog part is only 6. 9 mW, considering the consumption of digital part, FOM value is smaller than 3 pJ/stcp, the whole chip size including PAD is 1.4 mm × 1.6 mm.
出处
《半导体技术》
CAS
CSCD
北大核心
2009年第10期1027-1031,共5页
Semiconductor Technology
基金
"十一五"863计划重点项目(2008AA010708)
