This paper presents a highly linear current-controlled ring-oscillator (CCRO) circuit for current-to-frequency ADC in smart sensing. The proposed CCRO topology employs a distributed regulation of the oscillator rail voltage for lowering its sensitivity with respect to the controlling input current. The use of a current conveyor for this purpose ensures the stability of the current-steering control loop together with low-area and low-power overheads. A practical circuit design example is supplied in 0.18-μm 1P6M CMOS technology consisting on a 10-bit 100-kS/s ADC without the need of any digital calibration nor postcompensation technique.
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机译:本文介绍了一种高度线性电流控制的环形振荡器(CCRO)电路,用于智能感测的电流频率ADC。所提出的CCRO拓扑采用振荡器轨道电压的分布调节,以降低其对控制输入电流的灵敏度。为此目的使用电流输送机确保电流转向控制环的稳定性以及低电源开销。实用的电路设计示例以0.18-μm1p6mcmos技术提供,包括在10位100 ks / s ADC上,而无需任何数字校准和后补偿技术。
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