Linear Current-Controlled Oscillator for Analog to Digital Conversion

被引：0
|
作者：
Raghunandan, K. R. [1 ]
Viswanathan, T. Lakshmi [1 ]
Viswanathan, T. R. [1 ]
机构：
[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
来源：
2014 IEEE PROCEEDINGS OF THE CUSTOM INTEGRATED CIRCUITS CONFERENCE (CICC) | 2014年
关键词：
LOW-JITTER;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Current-controlled oscillators (CCO) for analog to digital conversion need linear tuning-characteristics. A new CCO design in which the period of oscillation is defined by charging the timing capacitor to a reference voltage by the input current, is described. The sources of non-linearity in the tuning characteristics are identified and modeled. A method of compensating for these errors is presented. Process and temperature effects are minimized by trading speed for robustness in manufacturing. The design has been verified by simulations as well as fabricating a prototype in a typical 0 : 1 8 mu m process node. Simulation results indicate that 0.2% linearity can be obtained from 0 1 0 0 deg C for the frequency range upto 5 0 0 MHz. The main idea is to improve linearity by design as much as possible before performing calibration.
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页数：4
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