摘要 : An on-chip CMOS relaxation oscillator with voltage averaging feedback using a reference proportional to supply voltage is presented. A voltage-averaging feedback (VAF) concept is proposed to overcome conventional relaxation oscill... 展开 An on-chip CMOS relaxation oscillator with voltage averaging feedback using a reference proportional to supply voltage is presented. A voltage-averaging feedback (VAF) concept is proposed to overcome conventional relaxation oscillator problems such as sensitivity to comparator delay, aging, and flicker noise of current sources. A test-chip with typical frequency of 14.0 $~$MHz was fabricated in a 0.18$~mu{hbox {m}}$ standard CMOS process and measured frequency variations of $pm $0.16% for supply changes from 1.7 to 1.9 V and $pm $ 0.19% for temperature changes from $-$40 to 125 $,^{circ}hbox{C}$. The prototype draws 25$~mu{hbox{A}}$ from a 1.8 V supply, occupies 0.04 $~{hbox {mm}}^{2}$, and achieves 7$times$ reduction in accumulated jitter (at 1500th cycle) as compared to a oscillator without VAF. 收起