A 3.8 MHz CMOS Wien-bridge oscillator with differential capacitive automatic amplitude control

IEICE Electronics Express

Hyunchol Shin¹  Hyeongyeol Park¹ 

[1] Electronics Convergence Eng. Dept., Kwangwoon University

关键词: Wien-bridge;    harmonic oscillator;    automatic amplitude control;    ultra-low-power;    CMOS;   

DOI  :  10.1587/elex.11.20140681

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)A 3.8-MHz Wien-bridge oscillator is designed in low-cost 0.35 µm CMOS process. The amplifier gain control is done by MOS capacitors rather than by more nonlinear MOS resistors. A differential amplitude control loop controls two MOS capacitors in differential manner, which greatly reduces the feedback loop bandwidth without using any off-chip filters, hence almost completely eliminate the unwanted operating point disturbance of the oscillator core. The fabricated chip consumes 0.22 mA from 2 V supply, and shows �?41.1 dB of second harmonic component and �?94.3 dBc/Hz phase noise at 100 kHz offset.

【 授权许可】

Unknown