摘要
详细论述了Σ-Δ调制器的工作原理,在此基础上设计了一种2阶前馈方式Σ-Δ调制器。分析了系统函数以及零极点的分布情况,确认了系统稳定性、信噪比、无杂散动态范围、有效位数等系统特性。采用行为级建模与仿真,验证了设计的正确性。性能测试表明,芯片的ADC通路可以很好地实现模拟信号向数字信号的转换,保证了电路的可靠性。
The principle of Σ-Δ modulator was described.A 2nd-order feed-forward Σ-Δ modulator was designed.The system function and zero pole distribution were analyzed to verify system characteristics,such as system stability,signal-to-noise ratio(SNR),spurious free dynamic range(SFDR) and effective number of bits(EOB).Behavioral modeling and simulation were made to validate the design.Test results showed that the circuit could realize conversion from analog signal to digital signal in the ADC path,which ensured reliability of the circuit.
出处
《微电子学》
CAS
CSCD
北大核心
2012年第2期191-194,共4页
Microelectronics