题目/Title：A 41μA Direct Frequency Modulation IC for Indoor Voice Broadcast in LF Band with Background Frequency Calibration

作者/Author：
                        Yanshu Guo,Yaoyu Li,Linpei Zhang,Hanjun Jiang,Zhihua Wang,Wen Jia

会议/Conference：ICTA 2020

地点/Location：Nanjing, China

年份/Issue Date：2020.23-25 Nov.

页码/pages：pp.53-54

摘要/Abstract：
This paper presents a low power direct frequency modulation IC in LF Band for the indoor voice broadcast application. The IC is mainly composed of a current starved voltage controlled ring oscillator modulated by the voice signal directly. A digital background frequency calibration loop is proposed to calibrate the frequency error/drift. Fabricated in 180nm CMOS, the chip occupies an area of 2.52mm 2 . Under 1.8V supply voltage, the frequency modulation IC consume less than 41μA with a 5pF load capacitor. The measured conversion gain in the voice band is not less than 4.0kHz/mV.