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Linearity of bulk-controlled inverter ring VCO in weak and strong inversion

机译:弱逆变和强逆变中大容量控制逆变器环VCO的线性

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Frequency modulation in ring VCOs is investigated. Primarily, the linearity of conversion from input voltage to output frequency is considered. Bulk-voltage control of the threshold voltage of the VCO transistors is found to be a very promising approach for applications in frequency /spl Delta//spl Sigma/ converters. Different approaches apply in presence of high supply voltages, when transistors work in strong inversion, compared to low supply voltages, when transistors are in weak inversion. In strong inversion, second-order effects controlled by the supply voltage linearize the VCO modulation, while in weak inversion an improved linearity can be obtained using soft rails, at the expense of a reduced sensitivity.
机译:研究了环形VCO中的频率调制。首先,考虑从输入电压到输出频率的转换线性。对于频率/ spl Delta // spl Sigma /转换器中的应用,发现对VCO晶体管的阈值电压进行大电压控制是一种非常有前途的方法。当晶体管处于强反转状态时,与处于晶体管反向弱状态时的低电源电压相比,在高电源电压存在时,可采用不同的方法。在强反转中,由电源电压控制的二阶效应使VCO调制线性化,而在弱反转中,可以使用软轨获得改善的线性度,但会降低灵敏度。

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