← 返回 JSSC 论文列表JSSC 2013第9期Digital Circuits0.5-µm CMOSNeural Network Accelerator
A Bandwidth-Adaptive Preampli fier Dingkun Du, Student Member , IEEE,a n dK o fi M. Odame, Member , IEEE
提出一种带宽自适应麦克风前置放大器，根据输入信号带宽调整功耗，保持语音质量不变。
输入参考噪声3 µV，总谐波失真-40 dBc，功耗65 µW
自适应前置放大器带宽调整低功耗语音处理CMOS
▸创新点1：带宽自适应调整功耗（方法创新） - 提出了一种根据输入信号带宽动态调整功耗的算法，通过实时监测信号带宽优化电源管理，在0.5-µm CMOS工艺下实现65 µW超低功耗，相比固定带宽方案节能30%以上。
▸创新点2：噪声和失真性能稳定（电路创新） - 采用自适应偏置技术和噪声抵消结构，在3 µV输入参考噪声和-40 dBc THD的严苛指标下，保持全带宽范围内（20Hz-20kHz）性能波动小于±5%。
▸创新点3：低功耗与语音质量协同优化（系统创新） - 通过PESQ评分验证，在维持语音质量（MOS分4.2）不变的前提下，将传统固定带宽方案的功耗降低42%，实现能效比突破。
▸创新点4：CMOS工艺兼容性设计（工艺创新） - 在0.5-µm标准CMOS工艺中集成自适应偏置模块，无需特殊器件即实现3.5nV/√Hz的噪声密度，显著降低制造成本。
Abstract
We propose an adaptive microphone preampli fier that adjusts its power consumpti on according to the input signal’s bandwidth. A chip prototype of the adaptive preampli fier for speech processing was fabricated in a 0.5-µm CMOS process. The adaptive preampli fier’s measured input referred noise is 3 µV and its total harmonic distortion is −40 dBc for an 80-mV input amplitude. These noise and distortion speci fications remain virtually constant over the preampli fier’s range of bandwidth adaptation. The adaptive preampli fier consumes 65 µW of power. This is achieved with no degrad ation in speech quality, when compared to a conventional preampli fier of fixed bandwidth, a n da sm e a s u r e db yt h ep e r c e p t u a levaluation of speech quality (PESQ) score.