一种用于高精度跟踪型RDC的压控振荡器

A VCO Used for High Precision Tracking RDC

基于恒压式电荷平衡压控振荡器技术,设计了一种用于高精度跟踪型RDC的VCO。结合RDC系统自身的特性,完成了时序控制电路及器件参数的详细设计,实现了一种具有高线性度(<0.25%)、压控增益外部可调等特点的VCO并完成版图设计。该VCO可推广应用于其他类似要求的专用ASIC电路中。

A voltage controlled oscillator （VCO） used for high precision tracking resolver-to- digital converter（RDC） has been designed based on the technology of constant-voltage charge balancing oscillator. The time-series circuit and the device parameters of VCO have been designed to satisfy RDC special characteristics. High linearity VCO （less than 0.25%） has been implemented, and the voltage-controlling gain can be adjustable. Its layout has been finished, and can be widely applied to other ASIC.